commiting ownCloud 1.0 beta 1v1.0.0beta1

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diff --git a/inc/PEAR/ErrorStack.php b/inc/PEAR/ErrorStack.php
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+<?php
+//
+// +----------------------------------------------------------------------+
+// | PHP Version 5                                                        |
+// +----------------------------------------------------------------------+
+// | Copyright (c) 1997-2004 The PHP Group                                |
+// +----------------------------------------------------------------------+
+// | This source file is subject to version 3.0 of the PHP license,       |
+// | that is bundled with this package in the file LICENSE, and is        |
+// | available through the world-wide-web at the following url:           |
+// | http://www.php.net/license/3_0.txt.                                  |
+// | If you did not receive a copy of the PHP license and are unable to   |
+// | obtain it through the world-wide-web, please send a note to          |
+// | license@php.net so we can mail you a copy immediately.               |
+// +----------------------------------------------------------------------+
+// | Author: Gregory Beaver <cellog@php.net>                              |
+// |                                                                      |
+// +----------------------------------------------------------------------+
+//
+// $Id: ErrorStack.php,v 1.7.2.5 2005/01/01 21:26:51 cellog Exp $
+
+/**
+ * Error Stack Implementation
+ * 
+ * This is an incredibly simple implementation of a very complex error handling
+ * facility.  It contains the ability
+ * to track multiple errors from multiple packages simultaneously.  In addition,
+ * it can track errors of many levels, save data along with the error, context
+ * information such as the exact file, line number, class and function that
+ * generated the error, and if necessary, it can raise a traditional PEAR_Error.
+ * It has built-in support for PEAR::Log, to log errors as they occur
+ * 
+ * Since version 0.2alpha, it is also possible to selectively ignore errors,
+ * through the use of an error callback, see {@link pushCallback()}
+ * 
+ * Since version 0.3alpha, it is possible to specify the exception class
+ * returned from {@link push()}
+ *
+ * Since version PEAR1.3.2, ErrorStack no longer instantiates an exception class.  This can
+ * still be done quite handily in an error callback or by manipulating the returned array
+ * @author Greg Beaver <cellog@php.net>
+ * @version PEAR1.3.2 (beta)
+ * @package PEAR_ErrorStack
+ * @category Debugging
+ * @license http://www.php.net/license/3_0.txt PHP License v3.0
+ */
+
+/**
+ * Singleton storage
+ * 
+ * Format:
+ * <pre>
+ * array(
+ *  'package1' => PEAR_ErrorStack object,
+ *  'package2' => PEAR_ErrorStack object,
+ *  ...
+ * )
+ * </pre>
+ * @access private
+ * @global array $GLOBALS['_PEAR_ERRORSTACK_SINGLETON']
+ */
+$GLOBALS['_PEAR_ERRORSTACK_SINGLETON'] = array();
+
+/**
+ * Global error callback (default)
+ * 
+ * This is only used if set to non-false.  * is the default callback for
+ * all packages, whereas specific packages may set a default callback
+ * for all instances, regardless of whether they are a singleton or not.
+ *
+ * To exclude non-singletons, only set the local callback for the singleton
+ * @see PEAR_ErrorStack::setDefaultCallback()
+ * @access private
+ * @global array $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_CALLBACK']
+ */
+$GLOBALS['_PEAR_ERRORSTACK_DEFAULT_CALLBACK'] = array(
+    '*' => false,
+);
+
+/**
+ * Global Log object (default)
+ * 
+ * This is only used if set to non-false.  Use to set a default log object for
+ * all stacks, regardless of instantiation order or location
+ * @see PEAR_ErrorStack::setDefaultLogger()
+ * @access private
+ * @global array $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER']
+ */
+$GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER'] = false;
+
+/**
+ * Global Overriding Callback
+ * 
+ * This callback will override any error callbacks that specific loggers have set.
+ * Use with EXTREME caution
+ * @see PEAR_ErrorStack::staticPushCallback()
+ * @access private
+ * @global array $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER']
+ */
+$GLOBALS['_PEAR_ERRORSTACK_OVERRIDE_CALLBACK'] = array();
+
+/**#@+
+ * One of four possible return values from the error Callback
+ * @see PEAR_ErrorStack::_errorCallback()
+ */
+/**
+ * If this is returned, then the error will be both pushed onto the stack
+ * and logged.
+ */
+define('PEAR_ERRORSTACK_PUSHANDLOG', 1);
+/**
+ * If this is returned, then the error will only be pushed onto the stack,
+ * and not logged.
+ */
+define('PEAR_ERRORSTACK_PUSH', 2);
+/**
+ * If this is returned, then the error will only be logged, but not pushed
+ * onto the error stack.
+ */
+define('PEAR_ERRORSTACK_LOG', 3);
+/**
+ * If this is returned, then the error is completely ignored.
+ */
+define('PEAR_ERRORSTACK_IGNORE', 4);
+/**
+ * If this is returned, then the error is logged and die() is called.
+ */
+define('PEAR_ERRORSTACK_DIE', 5);
+/**#@-*/
+
+/**
+ * Error code for an attempt to instantiate a non-class as a PEAR_ErrorStack in
+ * the singleton method.
+ */
+define('PEAR_ERRORSTACK_ERR_NONCLASS', 1);
+
+/**
+ * Error code for an attempt to pass an object into {@link PEAR_ErrorStack::getMessage()}
+ * that has no __toString() method
+ */
+define('PEAR_ERRORSTACK_ERR_OBJTOSTRING', 2);
+/**
+ * Error Stack Implementation
+ *
+ * Usage:
+ * <code>
+ * // global error stack
+ * $global_stack = &PEAR_ErrorStack::singleton('MyPackage');
+ * // local error stack
+ * $local_stack = new PEAR_ErrorStack('MyPackage');
+ * </code>
+ * @copyright 2004 Gregory Beaver
+ * @package PEAR_ErrorStack
+ * @license http://www.php.net/license/3_0.txt PHP License
+ */
+class PEAR_ErrorStack {
+    /**
+     * Errors are stored in the order that they are pushed on the stack.
+     * @since 0.4alpha Errors are no longer organized by error level.
+     * This renders pop() nearly unusable, and levels could be more easily
+     * handled in a callback anyway
+     * @var array
+     * @access private
+     */
+    var $_errors = array();
+
+    /**
+     * Storage of errors by level.
+     *
+     * Allows easy retrieval and deletion of only errors from a particular level
+     * @since PEAR 1.4.0dev
+     * @var array
+     * @access private
+     */
+    var $_errorsByLevel = array();
+
+    /**
+     * Package name this error stack represents
+     * @var string
+     * @access protected
+     */
+    var $_package;
+    
+    /**
+     * Determines whether a PEAR_Error is thrown upon every error addition
+     * @var boolean
+     * @access private
+     */
+    var $_compat = false;
+    
+    /**
+     * If set to a valid callback, this will be used to generate the error
+     * message from the error code, otherwise the message passed in will be
+     * used
+     * @var false|string|array
+     * @access private
+     */
+    var $_msgCallback = false;
+    
+    /**
+     * If set to a valid callback, this will be used to generate the error
+     * context for an error.  For PHP-related errors, this will be a file
+     * and line number as retrieved from debug_backtrace(), but can be
+     * customized for other purposes.  The error might actually be in a separate
+     * configuration file, or in a database query.
+     * @var false|string|array
+     * @access protected
+     */
+    var $_contextCallback = false;
+    
+    /**
+     * If set to a valid callback, this will be called every time an error
+     * is pushed onto the stack.  The return value will be used to determine
+     * whether to allow an error to be pushed or logged.
+     * 
+     * The return value must be one an PEAR_ERRORSTACK_* constant
+     * @see PEAR_ERRORSTACK_PUSHANDLOG, PEAR_ERRORSTACK_PUSH, PEAR_ERRORSTACK_LOG
+     * @var false|string|array
+     * @access protected
+     */
+    var $_errorCallback = array();
+    
+    /**
+     * PEAR::Log object for logging errors
+     * @var false|Log
+     * @access protected
+     */
+    var $_logger = false;
+    
+    /**
+     * Error messages - designed to be overridden
+     * @var array
+     * @abstract
+     */
+    var $_errorMsgs = array();
+    
+    /**
+     * Set up a new error stack
+     * 
+     * @param string   $package name of the package this error stack represents
+     * @param callback $msgCallback callback used for error message generation
+     * @param callback $contextCallback callback used for context generation,
+     *                 defaults to {@link getFileLine()}
+     * @param boolean  $throwPEAR_Error
+     */
+    function PEAR_ErrorStack($package, $msgCallback = false, $contextCallback = false,
+                         $throwPEAR_Error = false)
+    {
+        $this->_package = $package;
+        $this->setMessageCallback($msgCallback);
+        $this->setContextCallback($contextCallback);
+        $this->_compat = $throwPEAR_Error;
+    }
+    
+    /**
+     * Return a single error stack for this package.
+     * 
+     * Note that all parameters are ignored if the stack for package $package
+     * has already been instantiated
+     * @param string   $package name of the package this error stack represents
+     * @param callback $msgCallback callback used for error message generation
+     * @param callback $contextCallback callback used for context generation,
+     *                 defaults to {@link getFileLine()}
+     * @param boolean  $throwPEAR_Error
+     * @param string   $stackClass class to instantiate
+     * @static
+     * @return PEAR_ErrorStack
+     */
+    function &singleton($package, $msgCallback = false, $contextCallback = false,
+                         $throwPEAR_Error = false, $stackClass = 'PEAR_ErrorStack')
+    {
+        if (isset($GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package])) {
+            return $GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package];
+        }
+        if (!class_exists($stackClass)) {
+            if (function_exists('debug_backtrace')) {
+                $trace = debug_backtrace();
+            }
+            PEAR_ErrorStack::staticPush('PEAR_ErrorStack', PEAR_ERRORSTACK_ERR_NONCLASS,
+                'exception', array('stackclass' => $stackClass),
+                'stack class "%stackclass%" is not a valid class name (should be like PEAR_ErrorStack)',
+                false, $trace);
+        }
+        return $GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package] =
+            &new $stackClass($package, $msgCallback, $contextCallback, $throwPEAR_Error);
+    }
+
+    /**
+     * Internal error handler for PEAR_ErrorStack class
+     * 
+     * Dies if the error is an exception (and would have died anyway)
+     * @access private
+     */
+    function _handleError($err)
+    {
+        if ($err['level'] == 'exception') {
+            $message = $err['message'];
+            if (isset($_SERVER['REQUEST_URI'])) {
+                echo '<br />';
+            } else {
+                echo "\n";
+            }
+            var_dump($err['context']);
+            die($message);
+        }
+    }
+    
+    /**
+     * Set up a PEAR::Log object for all error stacks that don't have one
+     * @param Log $log 
+     * @static
+     */
+    function setDefaultLogger(&$log)
+    {
+        if (is_object($log) && method_exists($log, 'log') ) {
+            $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER'] = &$log;
+        } elseif (is_callable($log)) {
+            $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER'] = &$log;
+	}
+    }
+    
+    /**
+     * Set up a PEAR::Log object for this error stack
+     * @param Log $log 
+     */
+    function setLogger(&$log)
+    {
+        if (is_object($log) && method_exists($log, 'log') ) {
+            $this->_logger = &$log;
+        } elseif (is_callable($log)) {
+            $this->_logger = &$log;
+        }
+    }
+    
+    /**
+     * Set an error code => error message mapping callback
+     * 
+     * This method sets the callback that can be used to generate error
+     * messages for any instance
+     * @param array|string Callback function/method
+     */
+    function setMessageCallback($msgCallback)
+    {
+        if (!$msgCallback) {
+            $this->_msgCallback = array(&$this, 'getErrorMessage');
+        } else {
+            if (is_callable($msgCallback)) {
+                $this->_msgCallback = $msgCallback;
+            }
+        }
+    }
+    
+    /**
+     * Get an error code => error message mapping callback
+     * 
+     * This method returns the current callback that can be used to generate error
+     * messages
+     * @return array|string|false Callback function/method or false if none
+     */
+    function getMessageCallback()
+    {
+        return $this->_msgCallback;
+    }
+    
+    /**
+     * Sets a default callback to be used by all error stacks
+     * 
+     * This method sets the callback that can be used to generate error
+     * messages for a singleton
+     * @param array|string Callback function/method
+     * @param string Package name, or false for all packages
+     * @static
+     */
+    function setDefaultCallback($callback = false, $package = false)
+    {
+        if (!is_callable($callback)) {
+            $callback = false;
+        }
+        $package = $package ? $package : '*';
+        $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_CALLBACK'][$package] = $callback;
+    }
+    
+    /**
+     * Set a callback that generates context information (location of error) for an error stack
+     * 
+     * This method sets the callback that can be used to generate context
+     * information for an error.  Passing in NULL will disable context generation
+     * and remove the expensive call to debug_backtrace()
+     * @param array|string|null Callback function/method
+     */
+    function setContextCallback($contextCallback)
+    {
+        if ($contextCallback === null) {
+            return $this->_contextCallback = false;
+        }
+        if (!$contextCallback) {
+            $this->_contextCallback = array(&$this, 'getFileLine');
+        } else {
+            if (is_callable($contextCallback)) {
+                $this->_contextCallback = $contextCallback;
+            }
+        }
+    }
+    
+    /**
+     * Set an error Callback
+     * If set to a valid callback, this will be called every time an error
+     * is pushed onto the stack.  The return value will be used to determine
+     * whether to allow an error to be pushed or logged.
+     * 
+     * The return value must be one of the ERRORSTACK_* constants.
+     * 
+     * This functionality can be used to emulate PEAR's pushErrorHandling, and
+     * the PEAR_ERROR_CALLBACK mode, without affecting the integrity of
+     * the error stack or logging
+     * @see PEAR_ERRORSTACK_PUSHANDLOG, PEAR_ERRORSTACK_PUSH, PEAR_ERRORSTACK_LOG
+     * @see popCallback()
+     * @param string|array $cb
+     */
+    function pushCallback($cb)
+    {
+        array_push($this->_errorCallback, $cb);
+    }
+    
+    /**
+     * Remove a callback from the error callback stack
+     * @see pushCallback()
+     * @return array|string|false
+     */
+    function popCallback()
+    {
+        if (!count($this->_errorCallback)) {
+            return false;
+        }
+        return array_pop($this->_errorCallback);
+    }
+    
+    /**
+     * Set a temporary overriding error callback for every package error stack
+     *
+     * Use this to temporarily disable all existing callbacks (can be used
+     * to emulate the @ operator, for instance)
+     * @see PEAR_ERRORSTACK_PUSHANDLOG, PEAR_ERRORSTACK_PUSH, PEAR_ERRORSTACK_LOG
+     * @see staticPopCallback(), pushCallback()
+     * @param string|array $cb
+     * @static
+     */
+    function staticPushCallback($cb)
+    {
+        array_push($GLOBALS['_PEAR_ERRORSTACK_OVERRIDE_CALLBACK'], $cb);
+    }
+    
+    /**
+     * Remove a temporary overriding error callback
+     * @see staticPushCallback()
+     * @return array|string|false
+     * @static
+     */
+    function staticPopCallback()
+    {
+        $ret = array_pop($GLOBALS['_PEAR_ERRORSTACK_OVERRIDE_CALLBACK']);
+        if (!is_array($GLOBALS['_PEAR_ERRORSTACK_OVERRIDE_CALLBACK'])) {
+            $GLOBALS['_PEAR_ERRORSTACK_OVERRIDE_CALLBACK'] = array();
+        }
+        return $ret;
+    }
+    
+    /**
+     * Add an error to the stack
+     * 
+     * If the message generator exists, it is called with 2 parameters.
+     *  - the current Error Stack object
+     *  - an array that is in the same format as an error.  Available indices
+     *    are 'code', 'package', 'time', 'params', 'level', and 'context'
+     * 
+     * Next, if the error should contain context information, this is
+     * handled by the context grabbing method.
+     * Finally, the error is pushed onto the proper error stack
+     * @param int    $code      Package-specific error code
+     * @param string $level     Error level.  This is NOT spell-checked
+     * @param array  $params    associative array of error parameters
+     * @param string $msg       Error message, or a portion of it if the message
+     *                          is to be generated
+     * @param array  $repackage If this error re-packages an error pushed by
+     *                          another package, place the array returned from
+     *                          {@link pop()} in this parameter
+     * @param array  $backtrace Protected parameter: use this to pass in the
+     *                          {@link debug_backtrace()} that should be used
+     *                          to find error context
+     * @return PEAR_Error|array|Exception
+     *                          if compatibility mode is on, a PEAR_Error is also
+     *                          thrown.  If the class Exception exists, then one
+     *                          is returned to allow code like:
+     * <code>
+     * throw ($stack->push(MY_ERROR_CODE, 'error', array('username' => 'grob')));
+     * </code>
+     * 
+     * The errorData property of the exception class will be set to the array
+     * that would normally be returned.  If a PEAR_Error is returned, the userinfo
+     * property is set to the array
+     * 
+     * Otherwise, an array is returned in this format:
+     * <code>
+     * array(
+     *    'code' => $code,
+     *    'params' => $params,
+     *    'package' => $this->_package,
+     *    'level' => $level,
+     *    'time' => time(),
+     *    'context' => $context,
+     *    'message' => $msg,
+     * //['repackage' => $err] repackaged error array/Exception class
+     * );
+     * </code>
+     */
+    function push($code, $level = 'error', $params = array(), $msg = false,
+                  $repackage = false, $backtrace = false)
+    {
+        $context = false;
+        // grab error context
+        if ($this->_contextCallback) {
+            if (!$backtrace) {
+                $backtrace = debug_backtrace();
+            }
+            $context = call_user_func($this->_contextCallback, $code, $params, $backtrace);
+        }
+        
+        // save error
+        $time = explode(' ', microtime());
+        $time = $time[1] + $time[0];
+        $err = array(
+                'code' => $code,
+                'params' => $params,
+                'package' => $this->_package,
+                'level' => $level,
+                'time' => $time,
+                'context' => $context,
+                'message' => $msg,
+               );
+
+        // set up the error message, if necessary
+        if ($this->_msgCallback) {
+            $msg = call_user_func_array($this->_msgCallback,
+                                        array(&$this, $err));
+            $err['message'] = $msg;
+        }        
+        
+        if ($repackage) {
+            $err['repackage'] = $repackage;
+        }
+        $push = $log = true;
+        $die = false;
+        // try the overriding callback first
+        $callback = $this->staticPopCallback();
+        if ($callback) {
+            $this->staticPushCallback($callback);
+        }
+        if (!is_callable($callback)) {
+            // try the local callback next
+            $callback = $this->popCallback();
+            if (is_callable($callback)) {
+                $this->pushCallback($callback);
+            } else {
+                // try the default callback
+                $callback = isset($GLOBALS['_PEAR_ERRORSTACK_DEFAULT_CALLBACK'][$this->_package]) ?
+                    $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_CALLBACK'][$this->_package] :
+                    $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_CALLBACK']['*'];
+            }
+        }
+        if (is_callable($callback)) {
+            switch(call_user_func($callback, $err)){
+            	case PEAR_ERRORSTACK_IGNORE: 
+            		return $err;
+        		break;
+            	case PEAR_ERRORSTACK_PUSH: 
+            		$log = false;
+        		break;
+            	case PEAR_ERRORSTACK_LOG: 
+            		$push = false;
+        		break;
+            	case PEAR_ERRORSTACK_DIE: 
+            		$die = true;
+        		break;
+                // anything else returned has the same effect as pushandlog
+            }
+        }
+        if ($push) {
+            array_unshift($this->_errors, $err);
+            $this->_errorsByLevel[$err['level']][] = &$this->_errors[0];
+        }
+        if ($log) {
+            if ($this->_logger || $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER']) {
+                $this->_log($err);
+            }
+        }
+        if ($die) {
+            die();
+        }
+        if ($this->_compat && $push) {
+            return $this->raiseError($msg, $code, null, null, $err);
+        }
+        return $err;
+    }
+    
+    /**
+     * Static version of {@link push()}
+     * 
+     * @param string $package   Package name this error belongs to
+     * @param int    $code      Package-specific error code
+     * @param string $level     Error level.  This is NOT spell-checked
+     * @param array  $params    associative array of error parameters
+     * @param string $msg       Error message, or a portion of it if the message
+     *                          is to be generated
+     * @param array  $repackage If this error re-packages an error pushed by
+     *                          another package, place the array returned from
+     *                          {@link pop()} in this parameter
+     * @param array  $backtrace Protected parameter: use this to pass in the
+     *                          {@link debug_backtrace()} that should be used
+     *                          to find error context
+     * @return PEAR_Error|null|Exception
+     *                          if compatibility mode is on, a PEAR_Error is also
+     *                          thrown.  If the class Exception exists, then one
+     *                          is returned to allow code like:
+     * <code>
+     * throw ($stack->push(MY_ERROR_CODE, 'error', array('username' => 'grob')));
+     * </code>
+     * @static
+     */
+    function staticPush($package, $code, $level = 'error', $params = array(),
+                        $msg = false, $repackage = false, $backtrace = false)
+    {
+        $s = &PEAR_ErrorStack::singleton($package);
+        if ($s->_contextCallback) {
+            if (!$backtrace) {
+                if (function_exists('debug_backtrace')) {
+                    $backtrace = debug_backtrace();
+                }
+            }
+        }
+        return $s->push($code, $level, $params, $msg, $repackage, $backtrace);
+    }
+    
+    /**
+     * Log an error using PEAR::Log
+     * @param array $err Error array
+     * @param array $levels Error level => Log constant map
+     * @access protected
+     */
+    function _log($err)
+    {
+        if ($this->_logger) {
+            $logger = &$this->_logger;
+        } else {
+            $logger = &$GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER'];
+        }
+        if (is_a($logger, 'Log')) {
+            $levels = array(
+                'exception' => PEAR_LOG_CRIT,
+                'alert' => PEAR_LOG_ALERT,
+                'critical' => PEAR_LOG_CRIT,
+                'error' => PEAR_LOG_ERR,
+                'warning' => PEAR_LOG_WARNING,
+                'notice' => PEAR_LOG_NOTICE,
+                'info' => PEAR_LOG_INFO,
+                'debug' => PEAR_LOG_DEBUG);
+            if (isset($levels[$err['level']])) {
+                $level = $levels[$err['level']];
+            } else {
+                $level = PEAR_LOG_INFO;
+            }
+            $logger->log($err['message'], $level, $err);
+        } else { // support non-standard logs
+            call_user_func($logger, $err);
+        }
+    }
+
+    
+    /**
+     * Pop an error off of the error stack
+     * 
+     * @return false|array
+     * @since 0.4alpha it is no longer possible to specify a specific error
+     * level to return - the last error pushed will be returned, instead
+     */
+    function pop()
+    {
+        return @array_shift($this->_errors);
+    }
+    
+    /**
+     * Determine whether there are any errors on the stack
+     * @param string|array Level name.  Use to determine if any errors
+     * of level (string), or levels (array) have been pushed
+     * @return boolean
+     */
+    function hasErrors($level = false)
+    {
+        if ($level) {
+            return isset($this->_errorsByLevel[$level]);
+        }
+        return count($this->_errors);
+    }
+    
+    /**
+     * Retrieve all errors since last purge
+     * 
+     * @param boolean set in order to empty the error stack
+     * @param string level name, to return only errors of a particular severity
+     * @return array
+     */
+    function getErrors($purge = false, $level = false)
+    {
+        if (!$purge) {
+            if ($level) {
+                if (!isset($this->_errorsByLevel[$level])) {
+                    return array();
+                } else {
+                    return $this->_errorsByLevel[$level];
+                }
+            } else {
+                return $this->_errors;
+            }
+        }
+        if ($level) {
+            $ret = $this->_errorsByLevel[$level];
+            foreach ($this->_errorsByLevel[$level] as $i => $unused) {
+                // entries are references to the $_errors array
+                $this->_errorsByLevel[$level][$i] = false;
+            }
+            // array_filter removes all entries === false
+            $this->_errors = array_filter($this->_errors);
+            unset($this->_errorsByLevel[$level]);
+            return $ret;
+        }
+        $ret = $this->_errors;
+        $this->_errors = array();
+        $this->_errorsByLevel = array();
+        return $ret;
+    }
+    
+    /**
+     * Determine whether there are any errors on a single error stack, or on any error stack
+     *
+     * The optional parameter can be used to test the existence of any errors without the need of
+     * singleton instantiation
+     * @param string|false Package name to check for errors
+     * @param string Level name to check for a particular severity
+     * @return boolean
+     * @static
+     */
+    function staticHasErrors($package = false, $level = false)
+    {
+        if ($package) {
+            if (!isset($GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package])) {
+                return false;
+            }
+            return $GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package]->hasErrors($level);
+        }
+        foreach ($GLOBALS['_PEAR_ERRORSTACK_SINGLETON'] as $package => $obj) {
+            if ($obj->hasErrors($level)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    
+    /**
+     * Get a list of all errors since last purge, organized by package
+     * @since PEAR 1.4.0dev BC break! $level is now in the place $merge used to be
+     * @param boolean $purge Set to purge the error stack of existing errors
+     * @param string  $level Set to a level name in order to retrieve only errors of a particular level
+     * @param boolean $merge Set to return a flat array, not organized by package
+     * @param array   $sortfunc Function used to sort a merged array - default
+     *        sorts by time, and should be good for most cases
+     * @static
+     * @return array 
+     */
+    function staticGetErrors($purge = false, $level = false, $merge = false,
+                             $sortfunc = array('PEAR_ErrorStack', '_sortErrors'))
+    {
+        $ret = array();
+        if (!is_callable($sortfunc)) {
+            $sortfunc = array('PEAR_ErrorStack', '_sortErrors');
+        }
+        foreach ($GLOBALS['_PEAR_ERRORSTACK_SINGLETON'] as $package => $obj) {
+            $test = $GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package]->getErrors($purge, $level);
+            if ($test) {
+                if ($merge) {
+                    $ret = array_merge($ret, $test);
+                } else {
+                    $ret[$package] = $test;
+                }
+            }
+        }
+        if ($merge) {
+            usort($ret, $sortfunc);
+        }
+        return $ret;
+    }
+    
+    /**
+     * Error sorting function, sorts by time
+     * @access private
+     */
+    function _sortErrors($a, $b)
+    {
+        if ($a['time'] == $b['time']) {
+            return 0;
+        }
+        if ($a['time'] < $b['time']) {
+            return 1;
+        }
+        return -1;
+    }
+
+    /**
+     * Standard file/line number/function/class context callback
+     *
+     * This function uses a backtrace generated from {@link debug_backtrace()}
+     * and so will not work at all in PHP < 4.3.0.  The frame should
+     * reference the frame that contains the source of the error.
+     * @return array|false either array('file' => file, 'line' => line,
+     *         'function' => function name, 'class' => class name) or
+     *         if this doesn't work, then false
+     * @param unused
+     * @param integer backtrace frame.
+     * @param array Results of debug_backtrace()
+     * @static
+     */
+    function getFileLine($code, $params, $backtrace = null)
+    {
+        if ($backtrace === null) {
+            return false;
+        }
+        $frame = 0;
+        $functionframe = 1;
+        if (!isset($backtrace[1])) {
+            $functionframe = 0;
+        } else {
+            while (isset($backtrace[$functionframe]['function']) &&
+                  $backtrace[$functionframe]['function'] == 'eval' &&
+                  isset($backtrace[$functionframe + 1])) {
+                $functionframe++;
+            }
+        }
+        if (isset($backtrace[$frame])) {
+            if (!isset($backtrace[$frame]['file'])) {
+                $frame++;
+            }
+            $funcbacktrace = $backtrace[$functionframe];
+            $filebacktrace = $backtrace[$frame];
+            $ret = array('file' => $filebacktrace['file'],
+                         'line' => $filebacktrace['line']);
+            // rearrange for eval'd code or create function errors
+            if (strpos($filebacktrace['file'], '(') && 
+            	  preg_match(';^(.*?)\((\d+)\) : (.*?)$;', $filebacktrace['file'],
+                  $matches)) {
+                $ret['file'] = $matches[1];
+                $ret['line'] = $matches[2] + 0;
+            }
+            if (isset($funcbacktrace['function']) && isset($backtrace[1])) {
+                if ($funcbacktrace['function'] != 'eval') {
+                    if ($funcbacktrace['function'] == '__lambda_func') {
+                        $ret['function'] = 'create_function() code';
+                    } else {
+                        $ret['function'] = $funcbacktrace['function'];
+                    }
+                }
+            }
+            if (isset($funcbacktrace['class']) && isset($backtrace[1])) {
+                $ret['class'] = $funcbacktrace['class'];
+            }
+            return $ret;
+        }
+        return false;
+    }
+    
+    /**
+     * Standard error message generation callback
+     * 
+     * This method may also be called by a custom error message generator
+     * to fill in template values from the params array, simply
+     * set the third parameter to the error message template string to use
+     * 
+     * The special variable %__msg% is reserved: use it only to specify
+     * where a message passed in by the user should be placed in the template,
+     * like so:
+     * 
+     * Error message: %msg% - internal error
+     * 
+     * If the message passed like so:
+     * 
+     * <code>
+     * $stack->push(ERROR_CODE, 'error', array(), 'server error 500');
+     * </code>
+     * 
+     * The returned error message will be "Error message: server error 500 -
+     * internal error"
+     * @param PEAR_ErrorStack
+     * @param array
+     * @param string|false Pre-generated error message template
+     * @static
+     * @return string
+     */
+    function getErrorMessage(&$stack, $err, $template = false)
+    {
+        if ($template) {
+            $mainmsg = $template;
+        } else {
+            $mainmsg = $stack->getErrorMessageTemplate($err['code']);
+        }
+        $mainmsg = str_replace('%__msg%', $err['message'], $mainmsg);
+        if (count($err['params'])) {
+            foreach ($err['params'] as $name => $val) {
+                if (is_array($val)) {
+                    // @ is needed in case $val is a multi-dimensional array
+                    $val = @implode(', ', $val);
+                }
+                if (is_object($val)) {
+                    if (method_exists($val, '__toString')) {
+                        $val = $val->__toString();
+                    } else {
+                        PEAR_ErrorStack::staticPush('PEAR_ErrorStack', PEAR_ERRORSTACK_ERR_OBJTOSTRING,
+                            'warning', array('obj' => get_class($val)),
+                            'object %obj% passed into getErrorMessage, but has no __toString() method');
+                        $val = 'Object';
+                    }
+                }
+                $mainmsg = str_replace('%' . $name . '%', $val, $mainmsg);
+            }
+        }
+        return $mainmsg;
+    }
+    
+    /**
+     * Standard Error Message Template generator from code
+     * @return string
+     */
+    function getErrorMessageTemplate($code)
+    {
+        if (!isset($this->_errorMsgs[$code])) {
+            return '%__msg%';
+        }
+        return $this->_errorMsgs[$code];
+    }
+    
+    /**
+     * Set the Error Message Template array
+     * 
+     * The array format must be:
+     * <pre>
+     * array(error code => 'message template',...)
+     * </pre>
+     * 
+     * Error message parameters passed into {@link push()} will be used as input
+     * for the error message.  If the template is 'message %foo% was %bar%', and the
+     * parameters are array('foo' => 'one', 'bar' => 'six'), the error message returned will
+     * be 'message one was six'
+     * @return string
+     */
+    function setErrorMessageTemplate($template)
+    {
+        $this->_errorMsgs = $template;
+    }
+    
+    
+    /**
+     * emulate PEAR::raiseError()
+     * 
+     * @return PEAR_Error
+     */
+    function raiseError()
+    {
+        require_once 'PEAR.php';
+        $args = func_get_args();
+        return call_user_func_array(array('PEAR', 'raiseError'), $args);
+    }
+}
+$stack = &PEAR_ErrorStack::singleton('PEAR_ErrorStack');
+$stack->pushCallback(array('PEAR_ErrorStack', '_handleError'));
+?>
\ No newline at end of file