yuyue/ThinkPHP/Library/Behavior/FireShowPageTraceBehavior.class.php

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: luofei614 <weibo.com/luofei614>
// +----------------------------------------------------------------------
// $Id$

/**
 * 将Trace信息输出到火狐的firebug，从而不影响ajax效果和页面的布局。
 * 使用前，你需要先在火狐浏览器上安装firebug和firePHP两个插件。
 * 定义应用的tags.php文件， 
 * <code>
 * <?php return array(
 *   'app_end'=>array(
 *       'FireShowPageTrace'
 *   )
 * );
 * </code>
 * 再将此文件放到应用的Behavior文件夹中即可
 * 如果trace信息没有正常输出，请查看您的日志。
 * firePHP，是通过http headers和firebug通讯的，所以要保证在输出trace信息之前不能有
 * headers输出，你可以在入口文件第一行加入代码 ob_start(); 或者配置output_buffering
 *
 */
namespace Behavior;
/**
 * 系统行为扩展 页面Trace显示输出
 */
class FireShowPageTraceBehavior {
    protected $tracePagTabs =   array('BASE'=>'基本','FILE'=>'文件','INFO'=>'流程','ERR|NOTIC'=>'错误','SQL'=>'SQL','DEBUG'=>'调试');

    // 行为扩展的执行入口必须是run
    public function run(&$params){
        if(C('FIRE_SHOW_PAGE_TRACE',null,true)) $this->showTrace();
    }

    /**
     * 显示页面Trace信息
     * @access private
     */
    private function showTrace() {
         // 系统默认显示信息
        $files =  get_included_files();
        $info   =   array();
        foreach ($files as $key=>$file){
            $info[] = $file.' ( '.number_format(filesize($file)/1024,2).' KB )';
        }
        $trace  =   array();
        $base   =   array(
            '请求信息'=>  date('Y-m-d H:i:s',$_SERVER['REQUEST_TIME']).' '.$_SERVER['SERVER_PROTOCOL'].' '.$_SERVER['REQUEST_METHOD'].' : '.__SELF__,
            '运行时间'=> $this->showTime(),
            '内存开销'=> MEMORY_LIMIT_ON?number_format((memory_get_usage() - $GLOBALS['_startUseMems'])/1024,2).' kb':'不支持',
            '查询信息'=> N('db_query').' queries '.N('db_write').' writes ',
            '文件加载'=> count(get_included_files()),
            '缓存信息'=> N('cache_read').' gets '.N('cache_write').' writes ',
            '配置加载'=> count(c()),
            '会话信息'=> 'SESSION_ID='.session_id(),
            );
        // 读取应用定义的Trace文件
        $traceFile  =   CONF_PATH.'trace.php';
        if(is_file($traceFile)) {
            $base    =   array_merge($base,include $traceFile);
        }
        $debug  =   trace();
        $tabs   =   C('TRACE_PAGE_TABS',null,$this->tracePagTabs);
        foreach ($tabs as $name=>$title){
            switch(strtoupper($name)) {
                case 'BASE':// 基本信息
                    $trace[$title]  =   $base;
                    break;
                case 'FILE': // 文件信息
                    $trace[$title]  =   $info;
                    break;
                default:// 调试信息
                    if(strpos($name,'|')) {// 多组信息
                        $array  =   explode('|',$name);
                        $result =   array();
                        foreach($array as $name){
                            $result   +=   isset($debug[$name])?$debug[$name]:array();
                        }
                        $trace[$title]  =   $result;
                    }else{
                        $trace[$title]  =   isset($debug[$name])?$debug[$name]:'';
                    }
            }
        }
    foreach ($trace as $key=>$val){
            if(!is_array($val) && empty($val))
                $val=array();
            if(is_array($val)){
            $fire=array(
            array('','')
            );
            foreach($val as $k=>$v){
                $fire[]=array($k,$v);
            }
            fb(array($key,$fire),FirePHP::TABLE);
        }else{
            fb($val,$key);
        }
     }
    unset($files,$info,$log,$base);
    }

    /**
     * 获取运行时间
     */
    private function showTime() {
        // 显示运行时间
        G('beginTime',$GLOBALS['_beginTime']);
        G('viewEndTime');
        // 显示详细运行时间
        return G('beginTime','viewEndTime').'s ( Load:'.G('beginTime','loadTime').'s Init:'.G('loadTime','initTime').'s Exec:'.G('initTime','viewStartTime').'s Template:'.G('viewStartTime','viewEndTime').'s )';
    }

}


function fb()
{
    $instance = FirePHP::getInstance(true);
  
    $args = func_get_args();
    return call_user_func_array(array($instance,'fb'),$args);
}


class FB
{
    /**
     * Enable and disable logging to Firebug
     * 
     * @see FirePHP->setEnabled()
     * @param boolean $Enabled TRUE to enable, FALSE to disable
     * @return void
     */
    public static function setEnabled($Enabled)
    {
        $instance = FirePHP::getInstance(true);
        $instance->setEnabled($Enabled);
    }
  
    /**
     * Check if logging is enabled
     * 
     * @see FirePHP->getEnabled()
     * @return boolean TRUE if enabled
     */
    public static function getEnabled()
    {
        $instance = FirePHP::getInstance(true);
        return $instance->getEnabled();
    }  
  
    /**
     * Specify a filter to be used when encoding an object
     * 
     * Filters are used to exclude object members.
     * 
     * @see FirePHP->setObjectFilter()
     * @param string $Class The class name of the object
     * @param array $Filter An array or members to exclude
     * @return void
     */
    public static function setObjectFilter($Class, $Filter)
    {
      $instance = FirePHP::getInstance(true);
      $instance->setObjectFilter($Class, $Filter);
    }
  
    /**
     * Set some options for the library
     * 
     * @see FirePHP->setOptions()
     * @param array $Options The options to be set
     * @return void
     */
    public static function setOptions($Options)
    {
        $instance = FirePHP::getInstance(true);
        $instance->setOptions($Options);
    }

    /**
     * Get options for the library
     * 
     * @see FirePHP->getOptions()
     * @return array The options
     */
    public static function getOptions()
    {
        $instance = FirePHP::getInstance(true);
        return $instance->getOptions();
    }

    /**
     * Log object to firebug
     * 
     * @see http://www.firephp.org/Wiki/Reference/Fb
     * @param mixed $Object
     * @return true
     * @throws Exception
     */
    public static function send()
    {
        $instance = FirePHP::getInstance(true);
        $args = func_get_args();
        return call_user_func_array(array($instance,'fb'),$args);
    }

    /**
     * Start a group for following messages
     * 
     * Options:
     *   Collapsed: [true|false]
     *   Color:     [#RRGGBB|ColorName]
     *
     * @param string $Name
     * @param array $Options OPTIONAL Instructions on how to log the group
     * @return true
     */
    public static function group($Name, $Options=null)
    {
        $instance = FirePHP::getInstance(true);
        return $instance->group($Name, $Options);
    }

    /**
     * Ends a group you have started before
     *
     * @return true
     * @throws Exception
     */
    public static function groupEnd()
    {
        return self::send(null, null, FirePHP::GROUP_END);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::LOG
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public static function log($Object, $Label=null)
    {
        return self::send($Object, $Label, FirePHP::LOG);
    } 

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::INFO
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public static function info($Object, $Label=null)
    {
        return self::send($Object, $Label, FirePHP::INFO);
    } 

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::WARN
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public static function warn($Object, $Label=null)
    {
        return self::send($Object, $Label, FirePHP::WARN);
    } 

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::ERROR
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public static function error($Object, $Label=null)
    {
        return self::send($Object, $Label, FirePHP::ERROR);
    } 

    /**
     * Dumps key and variable to firebug server panel
     *
     * @see FirePHP::DUMP
     * @param string $Key
     * @param mixed $Variable
     * @return true
     * @throws Exception
     */
    public static function dump($Key, $Variable)
    {
        return self::send($Variable, $Key, FirePHP::DUMP);
    } 

    /**
     * Log a trace in the firebug console
     *
     * @see FirePHP::TRACE
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public static function trace($Label)
    {
        return self::send($Label, FirePHP::TRACE);
    } 

    /**
     * Log a table in the firebug console
     *
     * @see FirePHP::TABLE
     * @param string $Label
     * @param string $Table
     * @return true
     * @throws Exception
     */
    public static function table($Label, $Table)
    {
        return self::send($Table, $Label, FirePHP::TABLE);
    } 

}

if (!defined('E_STRICT')) {
    define('E_STRICT', 2048);
}
if (!defined('E_RECOVERABLE_ERROR')) {
    define('E_RECOVERABLE_ERROR', 4096);
}
if (!defined('E_DEPRECATED')) {
    define('E_DEPRECATED', 8192);
}
if (!defined('E_USER_DEPRECATED')) {
    define('E_USER_DEPRECATED', 16384);
} 
 
/**
 * Sends the given data to the FirePHP Firefox Extension.
 * The data can be displayed in the Firebug Console or in the
 * "Server" request tab.
 * 
 * For more information see: http://www.firephp.org/
 * 
 * @copyright       Copyright (C) 2007-2009 Christoph Dorn
 * @author          Christoph Dorn <christoph@christophdorn.com>
 * @license         http://www.opensource.org/licenses/bsd-license.php
 * @package         FirePHPCore
 */
class FirePHP {

    /**
     * FirePHP version
     *
     * @var string
     */
    const VERSION = '0.3';    // @pinf replace '0.3' with '%%package.version%%'

    /**
     * Firebug LOG level
     *
     * Logs a message to firebug console.
     * 
     * @var string
     */
    const LOG = 'LOG';
  
    /**
     * Firebug INFO level
     *
     * Logs a message to firebug console and displays an info icon before the message.
     * 
     * @var string
     */
    const INFO = 'INFO';
    
    /**
     * Firebug WARN level
     *
     * Logs a message to firebug console, displays an warning icon before the message and colors the line turquoise.
     * 
     * @var string
     */
    const WARN = 'WARN';
    
    /**
     * Firebug ERROR level
     *
     * Logs a message to firebug console, displays an error icon before the message and colors the line yellow. Also increments the firebug error count.
     * 
     * @var string
     */
    const ERROR = 'ERROR';
    
    /**
     * Dumps a variable to firebug's server panel
     *
     * @var string
     */
    const DUMP = 'DUMP';
    
    /**
     * Displays a stack trace in firebug console
     *
     * @var string
     */
    const TRACE = 'TRACE';
    
    /**
     * Displays an exception in firebug console
     * 
     * Increments the firebug error count.
     *
     * @var string
     */
    const EXCEPTION = 'EXCEPTION';
    
    /**
     * Displays an table in firebug console
     *
     * @var string
     */
    const TABLE = 'TABLE';
    
    /**
     * Starts a group in firebug console
     * 
     * @var string
     */
    const GROUP_START = 'GROUP_START';
    
    /**
     * Ends a group in firebug console
     * 
     * @var string
     */
    const GROUP_END = 'GROUP_END';
    
    /**
     * Singleton instance of FirePHP
     *
     * @var FirePHP
     */
    protected static $instance = null;
    
    /**
     * Flag whether we are logging from within the exception handler
     * 
     * @var boolean
     */
    protected $inExceptionHandler = false;
    
    /**
     * Flag whether to throw PHP errors that have been converted to ErrorExceptions
     * 
     * @var boolean
     */
    protected $throwErrorExceptions = true;
    
    /**
     * Flag whether to convert PHP assertion errors to Exceptions
     * 
     * @var boolean
     */
    protected $convertAssertionErrorsToExceptions = true;
    
    /**
     * Flag whether to throw PHP assertion errors that have been converted to Exceptions
     * 
     * @var boolean
     */
    protected $throwAssertionExceptions = false;

    /**
     * Wildfire protocol message index
     *
     * @var int
     */
    protected $messageIndex = 1;
    
    /**
     * Options for the library
     * 
     * @var array
     */
    protected $options = array('maxDepth' => 10,
                               'maxObjectDepth' => 5,
                               'maxArrayDepth' => 5,
                               'useNativeJsonEncode' => true,
                               'includeLineNumbers' => true);

    /**
     * Filters used to exclude object members when encoding
     * 
     * @var array
     */
    protected $objectFilters = array(
        'firephp' => array('objectStack', 'instance', 'json_objectStack'),
        'firephp_test_class' => array('objectStack', 'instance', 'json_objectStack')
    );

    /**
     * A stack of objects used to detect recursion during object encoding
     * 
     * @var object
     */
    protected $objectStack = array();

    /**
     * Flag to enable/disable logging
     * 
     * @var boolean
     */
    protected $enabled = true;

    /**
     * The insight console to log to if applicable
     * 
     * @var object
     */
    protected $logToInsightConsole = null;

    /**
     * When the object gets serialized only include specific object members.
     * 
     * @return array
     */  
    public function __sleep()
    {
        return array('options','objectFilters','enabled');
    }
    
    /**
     * Gets singleton instance of FirePHP
     *
     * @param boolean $AutoCreate
     * @return FirePHP
     */
    public static function getInstance($AutoCreate = false)
    {
        if ($AutoCreate===true && !self::$instance) {
            self::init();
        }
        return self::$instance;
    }
    
    /**
     * Creates FirePHP object and stores it for singleton access
     *
     * @return FirePHP
     */
    public static function init()
    {
        return self::setInstance(new self());
    }

    /**
     * Set the instance of the FirePHP singleton
     * 
     * @param FirePHP $instance The FirePHP object instance
     * @return FirePHP
     */
    public static function setInstance($instance)
    {
        return self::$instance = $instance;
    }

    /**
     * Set an Insight console to direct all logging calls to
     * 
     * @param object $console The console object to log to
     * @return void
     */
    public function setLogToInsightConsole($console)
    {
        if(is_string($console)) {
            if(get_class($this)!='FirePHP_Insight' && !is_subclass_of($this, 'FirePHP_Insight')) {
                throw new Exception('FirePHP instance not an instance or subclass of FirePHP_Insight!');
            }
            $this->logToInsightConsole = $this->to('request')->console($console);
        } else {
            $this->logToInsightConsole = $console;
        }
    }

    /**
     * Enable and disable logging to Firebug
     * 
     * @param boolean $Enabled TRUE to enable, FALSE to disable
     * @return void
     */
    public function setEnabled($Enabled)
    {
       $this->enabled = $Enabled;
    }
    
    /**
     * Check if logging is enabled
     * 
     * @return boolean TRUE if enabled
     */
    public function getEnabled()
    {
        return $this->enabled;
    }
    
    /**
     * Specify a filter to be used when encoding an object
     * 
     * Filters are used to exclude object members.
     * 
     * @param string $Class The class name of the object
     * @param array $Filter An array of members to exclude
     * @return void
     */
    public function setObjectFilter($Class, $Filter)
    {
        $this->objectFilters[strtolower($Class)] = $Filter;
    }
  
    /**
     * Set some options for the library
     * 
     * Options:
     *  - maxDepth: The maximum depth to traverse (default: 10)
     *  - maxObjectDepth: The maximum depth to traverse objects (default: 5)
     *  - maxArrayDepth: The maximum depth to traverse arrays (default: 5)
     *  - useNativeJsonEncode: If true will use json_encode() (default: true)
     *  - includeLineNumbers: If true will include line numbers and filenames (default: true)
     * 
     * @param array $Options The options to be set
     * @return void
     */
    public function setOptions($Options)
    {
        $this->options = array_merge($this->options,$Options);
    }

    /**
     * Get options from the library
     *
     * @return array The currently set options
     */
    public function getOptions()
    {
        return $this->options;
    }

    /**
     * Set an option for the library
     * 
     * @param string $Name
     * @param mixed $Value
     * @throws Exception
     * @return void
     */  
    public function setOption($Name, $Value)
    {
        if (!isset($this->options[$Name])) {
            throw $this->newException('Unknown option: ' . $Name);
        }
        $this->options[$Name] = $Value;
    }

    /**
     * Get an option from the library
     *
     * @param string $Name
     * @throws Exception
     * @return mixed
     */
    public function getOption($Name)
    {
        if (!isset($this->options[$Name])) {
            throw $this->newException('Unknown option: ' . $Name);
        }
        return $this->options[$Name];
    }

    /**
     * Register FirePHP as your error handler
     * 
     * Will throw exceptions for each php error.
     * 
     * @return mixed Returns a string containing the previously defined error handler (if any)
     */
    public function registerErrorHandler($throwErrorExceptions = false)
    {
        //NOTE: The following errors will not be caught by this error handler:
        //      E_ERROR, E_PARSE, E_CORE_ERROR,
        //      E_CORE_WARNING, E_COMPILE_ERROR,
        //      E_COMPILE_WARNING, E_STRICT
    
        $this->throwErrorExceptions = $throwErrorExceptions;
    
        return set_error_handler(array($this,'errorHandler'));     
    }

    /**
     * FirePHP's error handler
     * 
     * Throws exception for each php error that will occur.
     *
     * @param int $errno
     * @param string $errstr
     * @param string $errfile
     * @param int $errline
     * @param array $errcontext
     */
    public function errorHandler($errno, $errstr, $errfile, $errline, $errcontext)
    {
        // Don't throw exception if error reporting is switched off
        if (error_reporting() == 0) {
            return;
        }
        // Only throw exceptions for errors we are asking for
        if (error_reporting() & $errno) {

            $exception = new ErrorException($errstr, 0, $errno, $errfile, $errline);
            if ($this->throwErrorExceptions) {
                throw $exception;
            } else {
                $this->fb($exception);
            }
        }
    }
  
    /**
     * Register FirePHP as your exception handler
     * 
     * @return mixed Returns the name of the previously defined exception handler,
     *               or NULL on error.
     *               If no previous handler was defined, NULL is also returned.
     */
    public function registerExceptionHandler()
    {
        return set_exception_handler(array($this,'exceptionHandler'));     
    }
  
    /**
     * FirePHP's exception handler
     * 
     * Logs all exceptions to your firebug console and then stops the script.
     *
     * @param Exception $Exception
     * @throws Exception
     */
    function exceptionHandler($Exception)
    {
    
        $this->inExceptionHandler = true;
    
        header('HTTP/1.1 500 Internal Server Error');
    
        try {
            $this->fb($Exception);
        } catch (Exception $e) {
            echo 'We had an exception: ' . $e;
        }
        $this->inExceptionHandler = false;
    }
  
    /**
     * Register FirePHP driver as your assert callback
     * 
     * @param boolean $convertAssertionErrorsToExceptions
     * @param boolean $throwAssertionExceptions
     * @return mixed Returns the original setting or FALSE on errors
     */
    public function registerAssertionHandler($convertAssertionErrorsToExceptions = true, $throwAssertionExceptions = false)
    {
        $this->convertAssertionErrorsToExceptions = $convertAssertionErrorsToExceptions;
        $this->throwAssertionExceptions = $throwAssertionExceptions;
        
        if ($throwAssertionExceptions && !$convertAssertionErrorsToExceptions) {
            throw $this->newException('Cannot throw assertion exceptions as assertion errors are not being converted to exceptions!');
        }
        
        return assert_options(ASSERT_CALLBACK, array($this, 'assertionHandler'));
    }
  
    /**
     * FirePHP's assertion handler
     *
     * Logs all assertions to your firebug console and then stops the script.
     *
     * @param string $file File source of assertion
     * @param int    $line Line source of assertion
     * @param mixed  $code Assertion code
     */
    public function assertionHandler($file, $line, $code)
    {
        if ($this->convertAssertionErrorsToExceptions) {
          
          $exception = new ErrorException('Assertion Failed - Code[ '.$code.' ]', 0, null, $file, $line);
    
          if ($this->throwAssertionExceptions) {
              throw $exception;
          } else {
              $this->fb($exception);
          }
        
        } else {
            $this->fb($code, 'Assertion Failed', FirePHP::ERROR, array('File'=>$file,'Line'=>$line));
        }
    }
  
    /**
     * Start a group for following messages.
     * 
     * Options:
     *   Collapsed: [true|false]
     *   Color:     [#RRGGBB|ColorName]
     *
     * @param string $Name
     * @param array $Options OPTIONAL Instructions on how to log the group
     * @return true
     * @throws Exception
     */
    public function group($Name, $Options = null)
    {
    
        if (!$Name) {
            throw $this->newException('You must specify a label for the group!');
        }
        
        if ($Options) {
            if (!is_array($Options)) {
                throw $this->newException('Options must be defined as an array!');
            }
            if (array_key_exists('Collapsed', $Options)) {
                $Options['Collapsed'] = ($Options['Collapsed'])?'true':'false';
            }
        }
        
        return $this->fb(null, $Name, FirePHP::GROUP_START, $Options);
    }
  
    /**
     * Ends a group you have started before
     *
     * @return true
     * @throws Exception
     */
    public function groupEnd()
    {
        return $this->fb(null, null, FirePHP::GROUP_END);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::LOG
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public function log($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::LOG, $Options);
    } 

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::INFO
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public function info($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::INFO, $Options);
    } 

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::WARN
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public function warn($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::WARN, $Options);
    } 

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::ERROR
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public function error($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::ERROR, $Options);
    } 

    /**
     * Dumps key and variable to firebug server panel
     *
     * @see FirePHP::DUMP
     * @param string $Key
     * @param mixed $Variable
     * @return true
     * @throws Exception
     */
    public function dump($Key, $Variable, $Options = array())
    {
        if (!is_string($Key)) {
            throw $this->newException('Key passed to dump() is not a string');
        }
        if (strlen($Key)>100) {
            throw $this->newException('Key passed to dump() is longer than 100 characters');
        }
        if (!preg_match_all('/^[a-zA-Z0-9-_\.:]*$/', $Key, $m)) {
            throw $this->newException('Key passed to dump() contains invalid characters [a-zA-Z0-9-_\.:]');
        }
        return $this->fb($Variable, $Key, FirePHP::DUMP, $Options);
    }
  
    /**
     * Log a trace in the firebug console
     *
     * @see FirePHP::TRACE
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public function trace($Label)
    {
        return $this->fb($Label, FirePHP::TRACE);
    } 

    /**
     * Log a table in the firebug console
     *
     * @see FirePHP::TABLE
     * @param string $Label
     * @param string $Table
     * @return true
     * @throws Exception
     */
    public function table($Label, $Table, $Options = array())
    {
        return $this->fb($Table, $Label, FirePHP::TABLE, $Options);
    }

    /**
     * Insight API wrapper
     * 
     * @see Insight_Helper::to()
     */
    public static function to()
    {
        $instance = self::getInstance();
        if (!method_exists($instance, "_to")) {
            throw new Exception("FirePHP::to() implementation not loaded");
        }
        $args = func_get_args();
        return call_user_func_array(array($instance, '_to'), $args);
    }

    /**
     * Insight API wrapper
     * 
     * @see Insight_Helper::plugin()
     */
    public static function plugin()
    {
        $instance = self::getInstance();
        if (!method_exists($instance, "_plugin")) {
            throw new Exception("FirePHP::plugin() implementation not loaded");
        }
        $args = func_get_args();
        return call_user_func_array(array($instance, '_plugin'), $args);
    }

    /**
     * Check if FirePHP is installed on client
     *
     * @return boolean
     */
    public function detectClientExtension()
    {
        // Check if FirePHP is installed on client via User-Agent header
        if (@preg_match_all('/\sFirePHP\/([\.\d]*)\s?/si',$this->getUserAgent(),$m) &&
           version_compare($m[1][0],'0.0.6','>=')) {
            return true;
        } else
        // Check if FirePHP is installed on client via X-FirePHP-Version header
        if (@preg_match_all('/^([\.\d]*)$/si',$this->getRequestHeader("X-FirePHP-Version"),$m) &&
           version_compare($m[1][0],'0.0.6','>=')) {
            return true;
        }
        return false;
    }
 
    /**
     * Log varible to Firebug
     * 
     * @see http://www.firephp.org/Wiki/Reference/Fb
     * @param mixed $Object The variable to be logged
     * @return true Return TRUE if message was added to headers, FALSE otherwise
     * @throws Exception
     */
    public function fb($Object)
    {
        if($this instanceof FirePHP_Insight && method_exists($this, '_logUpgradeClientMessage')) {
            if(!FirePHP_Insight::$upgradeClientMessageLogged) {    // avoid infinite recursion as _logUpgradeClientMessage() logs a message
                $this->_logUpgradeClientMessage();
            }
        }

        static $insightGroupStack = array();

        if (!$this->getEnabled()) {
            return false;
        }

        if ($this->headersSent($filename, $linenum)) {
            // If we are logging from within the exception handler we cannot throw another exception
            if ($this->inExceptionHandler) {
                // Simply echo the error out to the page
                echo '<div style="border: 2px solid red; font-family: Arial; font-size: 12px; background-color: lightgray; padding: 5px;"><span style="color: red; font-weight: bold;">FirePHP ERROR:</span> Headers already sent in <b>'.$filename.'</b> on line <b>'.$linenum.'</b>. Cannot send log data to FirePHP. You must have Output Buffering enabled via ob_start() or output_buffering ini directive.</div>';
            } else {
                throw $this->newException('Headers already sent in '.$filename.' on line '.$linenum.'. Cannot send log data to FirePHP. You must have Output Buffering enabled via ob_start() or output_buffering ini directive.');
            }
        }
      
        $Type = null;
        $Label = null;
        $Options = array();
      
        if (func_num_args()==1) {
        } else
        if (func_num_args()==2) {
            switch(func_get_arg(1)) {
                case self::LOG:
                case self::INFO:
                case self::WARN:
                case self::ERROR:
                case self::DUMP:
                case self::TRACE:
                case self::EXCEPTION:
                case self::TABLE:
                case self::GROUP_START:
                case self::GROUP_END:
                    $Type = func_get_arg(1);
                    break;
                default:
                    $Label = func_get_arg(1);
                    break;
            }
        } else
        if (func_num_args()==3) {
            $Type = func_get_arg(2);
            $Label = func_get_arg(1);
        } else
        if (func_num_args()==4) {
            $Type = func_get_arg(2);
            $Label = func_get_arg(1);
            $Options = func_get_arg(3);
        } else {
            throw $this->newException('Wrong number of arguments to fb() function!');
        }

        if($this->logToInsightConsole!==null && (get_class($this)=='FirePHP_Insight' || is_subclass_of($this, 'FirePHP_Insight'))) {
            $msg = $this->logToInsightConsole;
            if ($Object instanceof Exception) {
                $Type = self::EXCEPTION;
            }
            if($Label && $Type!=self::TABLE && $Type!=self::GROUP_START) {
                $msg = $msg->label($Label);
            }
            switch($Type) {
                case self::DUMP:
                case self::LOG:
                    return $msg->log($Object);
                case self::INFO:
                    return $msg->info($Object);
                case self::WARN:
                    return $msg->warn($Object);
                case self::ERROR:
                    return $msg->error($Object);
                case self::TRACE:
                    return $msg->trace($Object);
                case self::EXCEPTION:
                    return $this->plugin('engine')->handleException($Object, $msg);
                case self::TABLE:
                    if (isset($Object[0]) && !is_string($Object[0]) && $Label) {
                        $Object = array($Label, $Object);
                    }
                    return $msg->table($Object[0], array_slice($Object[1],1), $Object[1][0]);
                case self::GROUP_START:
                    $insightGroupStack[] = $msg->group(md5($Label))->open();
                    return $msg->log($Label);
                case self::GROUP_END:
                    if(count($insightGroupStack)==0) {
                        throw new Error('Too many groupEnd() as opposed to group() calls!');
                    }
                    $group = array_pop($insightGroupStack);
                    return $group->close();
                default:
                    return $msg->log($Object);
            }
        }

        if (!$this->detectClientExtension()) {
            return false;
        }
      
        $meta = array();
        $skipFinalObjectEncode = false;
      
        if ($Object instanceof Exception) {
    
            $meta['file'] = $this->_escapeTraceFile($Object->getFile());
            $meta['line'] = $Object->getLine();
          
            $trace = $Object->getTrace();
            if ($Object instanceof ErrorException
               && isset($trace[0]['function'])
               && $trace[0]['function']=='errorHandler'
               && isset($trace[0]['class'])
               && $trace[0]['class']=='FirePHP') {
               
                $severity = false;
                switch($Object->getSeverity()) {
                    case E_WARNING: $severity = 'E_WARNING'; break;
                    case E_NOTICE: $severity = 'E_NOTICE'; break;
                    case E_USER_ERROR: $severity = 'E_USER_ERROR'; break;
                    case E_USER_WARNING: $severity = 'E_USER_WARNING'; break;
                    case E_USER_NOTICE: $severity = 'E_USER_NOTICE'; break;
                    case E_STRICT: $severity = 'E_STRICT'; break;
                    case E_RECOVERABLE_ERROR: $severity = 'E_RECOVERABLE_ERROR'; break;
                    case E_DEPRECATED: $severity = 'E_DEPRECATED'; break;
                    case E_USER_DEPRECATED: $severity = 'E_USER_DEPRECATED'; break;
                }
                   
                $Object = array('Class'=>get_class($Object),
                                'Message'=>$severity.': '.$Object->getMessage(),
                                'File'=>$this->_escapeTraceFile($Object->getFile()),
                                'Line'=>$Object->getLine(),
                                'Type'=>'trigger',
                                'Trace'=>$this->_escapeTrace(array_splice($trace,2)));
                $skipFinalObjectEncode = true;
            } else {
                $Object = array('Class'=>get_class($Object),
                                'Message'=>$Object->getMessage(),
                                'File'=>$this->_escapeTraceFile($Object->getFile()),
                                'Line'=>$Object->getLine(),
                                'Type'=>'throw',
                                'Trace'=>$this->_escapeTrace($trace));
                $skipFinalObjectEncode = true;
            }
            $Type = self::EXCEPTION;
          
        } else
        if ($Type==self::TRACE) {
          
            $trace = debug_backtrace();
            if (!$trace) return false;
            for( $i=0 ; $i<sizeof($trace) ; $i++ ) {
    
                if (isset($trace[$i]['class'])
                   && isset($trace[$i]['file'])
                   && ($trace[$i]['class']=='FirePHP'
                       || $trace[$i]['class']=='FB')
                   && (substr($this->_standardizePath($trace[$i]['file']),-18,18)=='FirePHPCore/fb.php'
                       || substr($this->_standardizePath($trace[$i]['file']),-29,29)=='FirePHPCore/FirePHP.class.php')) {
                    /* Skip - FB::trace(), FB::send(), $firephp->trace(), $firephp->fb() */
                } else
                if (isset($trace[$i]['class'])
                   && isset($trace[$i+1]['file'])
                   && $trace[$i]['class']=='FirePHP'
                   && substr($this->_standardizePath($trace[$i+1]['file']),-18,18)=='FirePHPCore/fb.php') {
                    /* Skip fb() */
                } else
                if ($trace[$i]['function']=='fb'
                   || $trace[$i]['function']=='trace'
                   || $trace[$i]['function']=='send') {

                    $Object = array('Class'=>isset($trace[$i]['class'])?$trace[$i]['class']:'',
                                    'Type'=>isset($trace[$i]['type'])?$trace[$i]['type']:'',
                                    'Function'=>isset($trace[$i]['function'])?$trace[$i]['function']:'',
                                    'Message'=>$trace[$i]['args'][0],
                                    'File'=>isset($trace[$i]['file'])?$this->_escapeTraceFile($trace[$i]['file']):'',
                                    'Line'=>isset($trace[$i]['line'])?$trace[$i]['line']:'',
                                    'Args'=>isset($trace[$i]['args'])?$this->encodeObject($trace[$i]['args']):'',
                                    'Trace'=>$this->_escapeTrace(array_splice($trace,$i+1)));
        
                    $skipFinalObjectEncode = true;
                    $meta['file'] = isset($trace[$i]['file'])?$this->_escapeTraceFile($trace[$i]['file']):'';
                    $meta['line'] = isset($trace[$i]['line'])?$trace[$i]['line']:'';
                    break;
                }
            }
    
        } else
        if ($Type==self::TABLE) {
          
            if (isset($Object[0]) && is_string($Object[0])) {
                $Object[1] = $this->encodeTable($Object[1]);
            } else {
                $Object = $this->encodeTable($Object);
            }
    
            $skipFinalObjectEncode = true;
          
        } else
        if ($Type==self::GROUP_START) {
          
            if (!$Label) {
                throw $this->newException('You must specify a label for the group!');
            }
          
        } else {
            if ($Type===null) {
                $Type = self::LOG;
            }
        }
        
        if ($this->options['includeLineNumbers']) {
            if (!isset($meta['file']) || !isset($meta['line'])) {
    
                $trace = debug_backtrace();
                for( $i=0 ; $trace && $i<sizeof($trace) ; $i++ ) {
          
                    if (isset($trace[$i]['class'])
                       && isset($trace[$i]['file'])
                       && ($trace[$i]['class']=='FirePHP'
                           || $trace[$i]['class']=='FB')
                       && (substr($this->_standardizePath($trace[$i]['file']),-18,18)=='FirePHPCore/fb.php'
                           || substr($this->_standardizePath($trace[$i]['file']),-29,29)=='FirePHPCore/FirePHP.class.php')) {
                        /* Skip - FB::trace(), FB::send(), $firephp->trace(), $firephp->fb() */
                    } else
                    if (isset($trace[$i]['class'])
                       && isset($trace[$i+1]['file'])
                       && $trace[$i]['class']=='FirePHP'
                       && substr($this->_standardizePath($trace[$i+1]['file']),-18,18)=='FirePHPCore/fb.php') {
                        /* Skip fb() */
                    } else
                    if (isset($trace[$i]['file'])
                       && substr($this->_standardizePath($trace[$i]['file']),-18,18)=='FirePHPCore/fb.php') {
                        /* Skip FB::fb() */
                    } else {
                        $meta['file'] = isset($trace[$i]['file'])?$this->_escapeTraceFile($trace[$i]['file']):'';
                        $meta['line'] = isset($trace[$i]['line'])?$trace[$i]['line']:'';
                        break;
                    }
                }      
            }
        } else {
            unset($meta['file']);
            unset($meta['line']);
        }

        $this->setHeader('X-Wf-Protocol-1','http://meta.wildfirehq.org/Protocol/JsonStream/0.2');
        $this->setHeader('X-Wf-1-Plugin-1','http://meta.firephp.org/Wildfire/Plugin/FirePHP/Library-FirePHPCore/'.self::VERSION);
     
        $structure_index = 1;
        if ($Type==self::DUMP) {
            $structure_index = 2;
            $this->setHeader('X-Wf-1-Structure-2','http://meta.firephp.org/Wildfire/Structure/FirePHP/Dump/0.1');
        } else {
            $this->setHeader('X-Wf-1-Structure-1','http://meta.firephp.org/Wildfire/Structure/FirePHP/FirebugConsole/0.1');
        }
      
        if ($Type==self::DUMP) {
            $msg = '{"'.$Label.'":'.$this->jsonEncode($Object, $skipFinalObjectEncode).'}';
        } else {
            $msg_meta = $Options;
            $msg_meta['Type'] = $Type;
            if ($Label!==null) {
                $msg_meta['Label'] = $Label;
            }
            if (isset($meta['file']) && !isset($msg_meta['File'])) {
                $msg_meta['File'] = $meta['file'];
            }
            if (isset($meta['line']) && !isset($msg_meta['Line'])) {
                $msg_meta['Line'] = $meta['line'];
            }
            $msg = '['.$this->jsonEncode($msg_meta).','.$this->jsonEncode($Object, $skipFinalObjectEncode).']';
        }
        
        $parts = explode("\n",chunk_split($msg, 5000, "\n"));
    
        for( $i=0 ; $i<count($parts) ; $i++) {
            
            $part = $parts[$i];
            if ($part) {
                
                if (count($parts)>2) {
                    // Message needs to be split into multiple parts
                    $this->setHeader('X-Wf-1-'.$structure_index.'-'.'1-'.$this->messageIndex,
                                     (($i==0)?strlen($msg):'')
                                     . '|' . $part . '|'
                                     . (($i<count($parts)-2)?'\\':''));
                } else {
                    $this->setHeader('X-Wf-1-'.$structure_index.'-'.'1-'.$this->messageIndex,
                                     strlen($part) . '|' . $part . '|');
                }
                
                $this->messageIndex++;
                
                if ($this->messageIndex > 99999) {
                    throw $this->newException('Maximum number (99,999) of messages reached!');             
                }
            }
        }
    
        $this->setHeader('X-Wf-1-Index',$this->messageIndex-1);
    
        return true;
    }
  
    /**
     * Standardizes path for windows systems.
     *
     * @param string $Path
     * @return string
     */
    protected function _standardizePath($Path)
    {
        return preg_replace('/\\\\+/','/',$Path);    
    }
  
    /**
     * Escape trace path for windows systems
     *
     * @param array $Trace
     * @return array
     */
    protected function _escapeTrace($Trace)
    {
        if (!$Trace) return $Trace;
        for( $i=0 ; $i<sizeof($Trace) ; $i++ ) {
            if (isset($Trace[$i]['file'])) {
                $Trace[$i]['file'] = $this->_escapeTraceFile($Trace[$i]['file']);
            }
            if (isset($Trace[$i]['args'])) {
                $Trace[$i]['args'] = $this->encodeObject($Trace[$i]['args']);
            }
        }
        return $Trace;    
    }
  
    /**
     * Escape file information of trace for windows systems
     *
     * @param string $File
     * @return string
     */
    protected function _escapeTraceFile($File)
    {
        /* Check if we have a windows filepath */
        if (strpos($File,'\\')) {
            /* First strip down to single \ */
          
            $file = preg_replace('/\\\\+/','\\',$File);
          
            return $file;
        }
        return $File;
    }

    /**
     * Check if headers have already been sent
     *
     * @param string $Filename
     * @param integer $Linenum
     */
    protected function headersSent(&$Filename, &$Linenum)
    {
        return headers_sent($Filename, $Linenum);
    }

    /**
     * Send header
     *
     * @param string $Name
     * @param string $Value
     */
    protected function setHeader($Name, $Value)
    {
        return header($Name.': '.$Value);
    }

    /**
     * Get user agent
     *
     * @return string|false
     */
    protected function getUserAgent()
    {
        if (!isset($_SERVER['HTTP_USER_AGENT'])) return false;
        return $_SERVER['HTTP_USER_AGENT'];
    }

    /**
     * Get all request headers
     * 
     * @return array
     */
    public static function getAllRequestHeaders() {
        static $_cached_headers = false;
        if($_cached_headers!==false) {
            return $_cached_headers;
        }
        $headers = array();
        if(function_exists('getallheaders')) {
            foreach( getallheaders() as $name => $value ) {
                $headers[strtolower($name)] = $value;
            }
        } else {
            foreach($_SERVER as $name => $value) {
                if(substr($name, 0, 5) == 'HTTP_') {
                    $headers[strtolower(str_replace(' ', '-', str_replace('_', ' ', substr($name, 5))))] = $value;
                }
            }
        }
        return $_cached_headers = $headers;
    }

    /**
     * Get a request header
     *
     * @return string|false
     */
    protected function getRequestHeader($Name)
    {
        $headers = self::getAllRequestHeaders();
        if (isset($headers[strtolower($Name)])) {
            return $headers[strtolower($Name)];
        }
        return false;
    }

    /**
     * Returns a new exception
     *
     * @param string $Message
     * @return Exception
     */
    protected function newException($Message)
    {
        return new Exception($Message);
    }
  
    /**
     * Encode an object into a JSON string
     * 
     * Uses PHP's jeson_encode() if available
     * 
     * @param object $Object The object to be encoded
     * @return string The JSON string
     */
    public function jsonEncode($Object, $skipObjectEncode = false)
    {
        if (!$skipObjectEncode) {
            $Object = $this->encodeObject($Object);
        }
        
        if (function_exists('json_encode')
           && $this->options['useNativeJsonEncode']!=false) {
    
            return json_encode($Object);
        } else {
            return $this->json_encode($Object);
        }
    }

    /**
     * Encodes a table by encoding each row and column with encodeObject()
     * 
     * @param array $Table The table to be encoded
     * @return array
     */  
    protected function encodeTable($Table)
    {
    
        if (!$Table) return $Table;
        
        $new_table = array();
        foreach($Table as $row) {
      
            if (is_array($row)) {
                $new_row = array();
            
                foreach($row as $item) {
                    $new_row[] = $this->encodeObject($item);
                }
            
                $new_table[] = $new_row;
            }
        }
        
        return $new_table;
    }

    /**
     * Encodes an object including members with
     * protected and private visibility
     * 
     * @param Object $Object The object to be encoded
     * @param int $Depth The current traversal depth
     * @return array All members of the object
     */
    protected function encodeObject($Object, $ObjectDepth = 1, $ArrayDepth = 1, $MaxDepth = 1)
    {
        if ($MaxDepth > $this->options['maxDepth']) {
            return '** Max Depth ('.$this->options['maxDepth'].') **';
        }

        $return = array();
    
        if (is_resource($Object)) {
    
            return '** '.(string)$Object.' **';
    
        } else    
        if (is_object($Object)) {
    
            if ($ObjectDepth > $this->options['maxObjectDepth']) {
                return '** Max Object Depth ('.$this->options['maxObjectDepth'].') **';
            }
            
            foreach ($this->objectStack as $refVal) {
                if ($refVal === $Object) {
                    return '** Recursion ('.get_class($Object).') **';
                }
            }
            array_push($this->objectStack, $Object);
                    
            $return['__className'] = $class = get_class($Object);
            $class_lower = strtolower($class);
    
            $reflectionClass = new ReflectionClass($class);  
            $properties = array();
            foreach( $reflectionClass->getProperties() as $property) {
                $properties[$property->getName()] = $property;
            }
                
            $members = (array)$Object;
    
            foreach( $properties as $plain_name => $property ) {
    
                $name = $raw_name = $plain_name;
                if ($property->isStatic()) {
                    $name = 'static:'.$name;
                }
                if ($property->isPublic()) {
                    $name = 'public:'.$name;
                } else
                if ($property->isPrivate()) {
                    $name = 'private:'.$name;
                    $raw_name = "\0".$class."\0".$raw_name;
                } else
                if ($property->isProtected()) {
                    $name = 'protected:'.$name;
                    $raw_name = "\0".'*'."\0".$raw_name;
                }
    
                if (!(isset($this->objectFilters[$class_lower])
                     && is_array($this->objectFilters[$class_lower])
                     && in_array($plain_name,$this->objectFilters[$class_lower]))) {
    
                    if (array_key_exists($raw_name,$members)
                       && !$property->isStatic()) {
                  
                        $return[$name] = $this->encodeObject($members[$raw_name], $ObjectDepth + 1, 1, $MaxDepth + 1);      
                
                    } else {
                        if (method_exists($property,'setAccessible')) {
                            $property->setAccessible(true);
                            $return[$name] = $this->encodeObject($property->getValue($Object), $ObjectDepth + 1, 1, $MaxDepth + 1);
                        } else
                        if ($property->isPublic()) {
                            $return[$name] = $this->encodeObject($property->getValue($Object), $ObjectDepth + 1, 1, $MaxDepth + 1);
                        } else {
                            $return[$name] = '** Need PHP 5.3 to get value **';
                        }
                    }
                } else {
                    $return[$name] = '** Excluded by Filter **';
                }
            }
            
            // Include all members that are not defined in the class
            // but exist in the object
            foreach( $members as $raw_name => $value ) {
    
                $name = $raw_name;
              
                if ($name{0} == "\0") {
                    $parts = explode("\0", $name);
                    $name = $parts[2];
                }
              
                $plain_name = $name;
    
                if (!isset($properties[$name])) {
                    $name = 'undeclared:'.$name;
    
                    if (!(isset($this->objectFilters[$class_lower])
                         && is_array($this->objectFilters[$class_lower])
                         && in_array($plain_name,$this->objectFilters[$class_lower]))) {
    
                        $return[$name] = $this->encodeObject($value, $ObjectDepth + 1, 1, $MaxDepth + 1);
                    } else {
                        $return[$name] = '** Excluded by Filter **';
                    }
                }
            }
            
            array_pop($this->objectStack);
            
        } elseif (is_array($Object)) {
    
            if ($ArrayDepth > $this->options['maxArrayDepth']) {
                return '** Max Array Depth ('.$this->options['maxArrayDepth'].') **';
            }
          
            foreach ($Object as $key => $val) {
              
                // Encoding the $GLOBALS PHP array causes an infinite loop
                // if the recursion is not reset here as it contains
                // a reference to itself. This is the only way I have come up
                // with to stop infinite recursion in this case.
                if ($key=='GLOBALS'
                   && is_array($val)
                   && array_key_exists('GLOBALS',$val)) {
                    $val['GLOBALS'] = '** Recursion (GLOBALS) **';
                }
              
                $return[$key] = $this->encodeObject($val, 1, $ArrayDepth + 1, $MaxDepth + 1);
            }
        } else {
            if (self::is_utf8($Object)) {
                return $Object;
            } else {
                return utf8_encode($Object);
            }
        }
        return $return;
    }

    /**
     * Returns true if $string is valid UTF-8 and false otherwise.
     *
     * @param mixed $str String to be tested
     * @return boolean
     */
    protected static function is_utf8($str)
    {
        if(function_exists('mb_detect_encoding')) {
            return (mb_detect_encoding($str) == 'UTF-8');
        }
        $c=0; $b=0;
        $bits=0;
        $len=strlen($str);
        for($i=0; $i<$len; $i++){
            $c=ord($str[$i]);
            if ($c > 128){
                if (($c >= 254)) return false;
                elseif ($c >= 252) $bits=6;
                elseif ($c >= 248) $bits=5;
                elseif ($c >= 240) $bits=4;
                elseif ($c >= 224) $bits=3;
                elseif ($c >= 192) $bits=2;
                else return false;
                if (($i+$bits) > $len) return false;
                while($bits > 1){
                    $i++;
                    $b=ord($str[$i]);
                    if ($b < 128 || $b > 191) return false;
                    $bits--;
                }
            }
        }
        return true;
    } 

    /**
     * Converts to and from JSON format.
     *
     * JSON (JavaScript Object Notation) is a lightweight data-interchange
     * format. It is easy for humans to read and write. It is easy for machines
     * to parse and generate. It is based on a subset of the JavaScript
     * Programming Language, Standard ECMA-262 3rd Edition - December 1999.
     * This feature can also be found in  Python. JSON is a text format that is
     * completely language independent but uses conventions that are familiar
     * to programmers of the C-family of languages, including C, C++, C#, Java,
     * JavaScript, Perl, TCL, and many others. These properties make JSON an
     * ideal data-interchange language.
     *
     * This package provides a simple encoder and decoder for JSON notation. It
     * is intended for use with client-side Javascript applications that make
     * use of HTTPRequest to perform server communication functions - data can
     * be encoded into JSON notation for use in a client-side javascript, or
     * decoded from incoming Javascript requests. JSON format is native to
     * Javascript, and can be directly eval()'ed with no further parsing
     * overhead
     *
     * All strings should be in ASCII or UTF-8 format!
     *
     * LICENSE: Redistribution and use in source and binary forms, with or
     * without modification, are permitted provided that the following
     * conditions are met: Redistributions of source code must retain the
     * above copyright notice, this list of conditions and the following
     * disclaimer. Redistributions in binary form must reproduce the above
     * copyright notice, this list of conditions and the following disclaimer
     * in the documentation and/or other materials provided with the
     * distribution.
     *
     * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
     * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
     * NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
     * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
     * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
     * DAMAGE.
     *
     * @category
     * @package     Services_JSON
     * @author      Michal Migurski <mike-json@teczno.com>
     * @author      Matt Knapp <mdknapp[at]gmail[dot]com>
     * @author      Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
     * @author      Christoph Dorn <christoph@christophdorn.com>
     * @copyright   2005 Michal Migurski
     * @version     CVS: $Id: JSON.php,v 1.31 2006/06/28 05:54:17 migurski Exp $
     * @license     http://www.opensource.org/licenses/bsd-license.php
     * @link        http://pear.php.net/pepr/pepr-proposal-show.php?id=198
     */
   
     
    /**
     * Keep a list of objects as we descend into the array so we can detect recursion.
     */
    private $json_objectStack = array();


   /**
    * convert a string from one UTF-8 char to one UTF-16 char
    *
    * Normally should be handled by mb_convert_encoding, but
    * provides a slower PHP-only method for installations
    * that lack the multibye string extension.
    *
    * @param    string  $utf8   UTF-8 character
    * @return   string  UTF-16 character
    * @access   private
    */
    private function json_utf82utf16($utf8)
    {
        // oh please oh please oh please oh please oh please
        if (function_exists('mb_convert_encoding')) {
            return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
        }

        switch(strlen($utf8)) {
            case 1:
                // this case should never be reached, because we are in ASCII range
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return $utf8;

            case 2:
                // return a UTF-16 character from a 2-byte UTF-8 char
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr(0x07 & (ord($utf8{0}) >> 2))
                       . chr((0xC0 & (ord($utf8{0}) << 6))
                       | (0x3F & ord($utf8{1})));

            case 3:
                // return a UTF-16 character from a 3-byte UTF-8 char
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr((0xF0 & (ord($utf8{0}) << 4))
                       | (0x0F & (ord($utf8{1}) >> 2)))
                       . chr((0xC0 & (ord($utf8{1}) << 6))
                       | (0x7F & ord($utf8{2})));
        }

        // ignoring UTF-32 for now, sorry
        return '';
    }

   /**
    * encodes an arbitrary variable into JSON format
    *
    * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
    *                           see argument 1 to Services_JSON() above for array-parsing behavior.
    *                           if var is a strng, note that encode() always expects it
    *                           to be in ASCII or UTF-8 format!
    *
    * @return   mixed   JSON string representation of input var or an error if a problem occurs
    * @access   public
    */
    private function json_encode($var)
    {
    
        if (is_object($var)) {
            if (in_array($var,$this->json_objectStack)) {
                return '"** Recursion **"';
            }
        }
          
        switch (gettype($var)) {
            case 'boolean':
                return $var ? 'true' : 'false';

            case 'NULL':
                return 'null';

            case 'integer':
                return (int) $var;

            case 'double':
            case 'float':
                return (float) $var;

            case 'string':
                // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
                $ascii = '';
                $strlen_var = strlen($var);

               /*
                * Iterate over every character in the string,
                * escaping with a slash or encoding to UTF-8 where necessary
                */
                for ($c = 0; $c < $strlen_var; ++$c) {

                    $ord_var_c = ord($var{$c});

                    switch (true) {
                        case $ord_var_c == 0x08:
                            $ascii .= '\b';
                            break;
                        case $ord_var_c == 0x09:
                            $ascii .= '\t';
                            break;
                        case $ord_var_c == 0x0A:
                            $ascii .= '\n';
                            break;
                        case $ord_var_c == 0x0C:
                            $ascii .= '\f';
                            break;
                        case $ord_var_c == 0x0D:
                            $ascii .= '\r';
                            break;

                        case $ord_var_c == 0x22:
                        case $ord_var_c == 0x2F:
                        case $ord_var_c == 0x5C:
                            // double quote, slash, slosh
                            $ascii .= '\\'.$var{$c};
                            break;

                        case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
                            // characters U-00000000 - U-0000007F (same as ASCII)
                            $ascii .= $var{$c};
                            break;

                        case (($ord_var_c & 0xE0) == 0xC0):
                            // characters U-00000080 - U-000007FF, mask 110XXXXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
                            $c += 1;
                            $utf16 = $this->json_utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xF0) == 0xE0):
                            // characters U-00000800 - U-0000FFFF, mask 1110XXXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}));
                            $c += 2;
                            $utf16 = $this->json_utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xF8) == 0xF0):
                            // characters U-00010000 - U-001FFFFF, mask 11110XXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}),
                                         ord($var{$c + 3}));
                            $c += 3;
                            $utf16 = $this->json_utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xFC) == 0xF8):
                            // characters U-00200000 - U-03FFFFFF, mask 111110XX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}),
                                         ord($var{$c + 3}),
                                         ord($var{$c + 4}));
                            $c += 4;
                            $utf16 = $this->json_utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xFE) == 0xFC):
                            // characters U-04000000 - U-7FFFFFFF, mask 1111110X
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                         ord($var{$c + 1}),
                                         ord($var{$c + 2}),
                                         ord($var{$c + 3}),
                                         ord($var{$c + 4}),
                                         ord($var{$c + 5}));
                            $c += 5;
                            $utf16 = $this->json_utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;
                    }
                }

                return '"'.$ascii.'"';

            case 'array':
                /*
                 * As per JSON spec if any array key is not an integer
                 * we must treat the the whole array as an object. We
                 * also try to catch a sparsely populated associative
                 * array with numeric keys here because some JS engines
                 * will create an array with empty indexes up to
                 * max_index which can cause memory issues and because
                 * the keys, which may be relevant, will be remapped
                 * otherwise.
                 *
                 * As per the ECMA and JSON specification an object may
                 * have any string as a property. Unfortunately due to
                 * a hole in the ECMA specification if the key is a
                 * ECMA reserved word or starts with a digit the
                 * parameter is only accessible using ECMAScript's
                 * bracket notation.
                 */

                // treat as a JSON object
                if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
                  
                    $this->json_objectStack[] = $var;

                    $properties = array_map(array($this, 'json_name_value'),
                                            array_keys($var),
                                            array_values($var));

                    array_pop($this->json_objectStack);

                    foreach($properties as $property) {
                        if ($property instanceof Exception) {
                            return $property;
                        }
                    }

                    return '{' . join(',', $properties) . '}';
                }

                $this->json_objectStack[] = $var;

                // treat it like a regular array
                $elements = array_map(array($this, 'json_encode'), $var);

                array_pop($this->json_objectStack);

                foreach($elements as $element) {
                    if ($element instanceof Exception) {
                        return $element;
                    }
                }

                return '[' . join(',', $elements) . ']';

            case 'object':
                $vars = self::encodeObject($var);

                $this->json_objectStack[] = $var;

                $properties = array_map(array($this, 'json_name_value'),
                                        array_keys($vars),
                                        array_values($vars));

                array_pop($this->json_objectStack);
              
                foreach($properties as $property) {
                    if ($property instanceof Exception) {
                        return $property;
                    }
                }
                     
                return '{' . join(',', $properties) . '}';

            default:
                return null;
        }
    }

   /**
    * array-walking function for use in generating JSON-formatted name-value pairs
    *
    * @param    string  $name   name of key to use
    * @param    mixed   $value  reference to an array element to be encoded
    *
    * @return   string  JSON-formatted name-value pair, like '"name":value'
    * @access   private
    */
    private function json_name_value($name, $value)
    {
        // Encoding the $GLOBALS PHP array causes an infinite loop
        // if the recursion is not reset here as it contains
        // a reference to itself. This is the only way I have come up
        // with to stop infinite recursion in this case.
        if ($name=='GLOBALS'
           && is_array($value)
           && array_key_exists('GLOBALS',$value)) {
            $value['GLOBALS'] = '** Recursion **';
        }
    
        $encoded_value = $this->json_encode($value);

        if ($encoded_value instanceof Exception) {
            return $encoded_value;
        }

        return $this->json_encode(strval($name)) . ':' . $encoded_value;
    }

    /**
     * @deprecated
     */    
    public function setProcessorUrl($URL)
    {
        trigger_error("The FirePHP::setProcessorUrl() method is no longer supported", E_USER_DEPRECATED);
    }

    /**
     * @deprecated
     */
    public function setRendererUrl($URL)
    {
        trigger_error("The FirePHP::setRendererUrl() method is no longer supported", E_USER_DEPRECATED);
    }  
}