diff --git a/LEGALNOTICE b/LEGALNOTICE
index c45955aa80acb557dad58ddb35d388e9a93f0198..4b751655a340547dff9bd536c070d9fdb33e5a57 100644
--- a/LEGALNOTICE
+++ b/LEGALNOTICE
@@ -134,7 +134,7 @@ THIRD-PARTY COMPONENTS AND LIBRARIES
 
 	Name:  PEAR (base system)
 	Link:  http://pear.php.net/package/PEAR
-	License:  PHP 3.01
+	License:  Modified BSD
 
 	Name:  PhpSecInfo
 	Link:  http://phpsec.org/projects/phpsecinfo/
diff --git a/libs/PEAR.php b/libs/PEAR.php
index 8575231715e65ca67f91580c4df6559b3a23eaa9..69b2655366f8c740e7ae99f1fd2f5168e4b49ea4 100644
--- a/libs/PEAR.php
+++ b/libs/PEAR.php
@@ -6,20 +6,14 @@
  *
  * PHP versions 4 and 5
  *
- * LICENSE: This source file is subject to version 3.0 of the PHP license
- * that is available through the world-wide-web at the following URI:
- * 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 web, please
- * send a note to license@php.net so we can mail you a copy immediately.
- *
  * @category   pear
  * @package    PEAR
  * @author     Sterling Hughes <sterling@php.net>
  * @author     Stig Bakken <ssb@php.net>
  * @author     Tomas V.V.Cox <cox@idecnet.com>
  * @author     Greg Beaver <cellog@php.net>
- * @copyright  1997-2006 The PHP Group
- * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
+ * @copyright  1997-2010 The Authors
+ * @license    http://opensource.org/licenses/bsd-license.php New BSD License
  * @version    CVS: $Id$
  * @link       http://pear.php.net/package/PEAR
  * @since      File available since Release 0.1
@@ -52,15 +46,6 @@ if (substr(PHP_OS, 0, 3) == 'WIN') {
     define('PEAR_OS',    'Unix'); // blatant assumption
 }
 
-// instant backwards compatibility
-if (!defined('PATH_SEPARATOR')) {
-    if (OS_WINDOWS) {
-        define('PATH_SEPARATOR', ';');
-    } else {
-        define('PATH_SEPARATOR', ':');
-    }
-}
-
 $GLOBALS['_PEAR_default_error_mode']     = PEAR_ERROR_RETURN;
 $GLOBALS['_PEAR_default_error_options']  = E_USER_NOTICE;
 $GLOBALS['_PEAR_destructor_object_list'] = array();
@@ -92,8 +77,8 @@ $GLOBALS['_PEAR_error_handler_stack']    = array();
  * @author     Tomas V.V. Cox <cox@idecnet.com>
  * @author     Greg Beaver <cellog@php.net>
  * @copyright  1997-2006 The PHP Group
- * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
- * @version    Release: 1.6.1
+ * @license    http://opensource.org/licenses/bsd-license.php New BSD License
+ * @version    Release: 1.9.1
  * @link       http://pear.php.net/package/PEAR
  * @see        PEAR_Error
  * @since      Class available since PHP 4.0.2
@@ -101,8 +86,6 @@ $GLOBALS['_PEAR_error_handler_stack']    = array();
  */
 class PEAR
 {
-    // {{{ properties
-
     /**
      * Whether to enable internal debug messages.
      *
@@ -153,10 +136,6 @@ class PEAR
      */
     var $_expected_errors = array();
 
-    // }}}
-
-    // {{{ constructor
-
     /**
      * Constructor.  Registers this object in
      * $_PEAR_destructor_object_list for destructor emulation if a
@@ -173,9 +152,11 @@ class PEAR
         if ($this->_debug) {
             print "PEAR constructor called, class=$classname\n";
         }
+
         if ($error_class !== null) {
             $this->_error_class = $error_class;
         }
+
         while ($classname && strcasecmp($classname, "pear")) {
             $destructor = "_$classname";
             if (method_exists($this, $destructor)) {
@@ -192,9 +173,6 @@ class PEAR
         }
     }
 
-    // }}}
-    // {{{ destructor
-
     /**
      * Destructor (the emulated type of...).  Does nothing right now,
      * but is included for forward compatibility, so subclass
@@ -212,9 +190,6 @@ class PEAR
         }
     }
 
-    // }}}
-    // {{{ getStaticProperty()
-
     /**
     * If you have a class that's mostly/entirely static, and you need static
     * properties, you can use this method to simulate them. Eg. in your method(s)
@@ -227,21 +202,20 @@ class PEAR
     * @return mixed   A reference to the variable. If not set it will be
     *                 auto initialised to NULL.
     */
-    static  function &getStaticProperty($class, $var)
+    function &getStaticProperty($class, $var)
     {
         static $properties;
         if (!isset($properties[$class])) {
             $properties[$class] = array();
         }
+
         if (!array_key_exists($var, $properties[$class])) {
             $properties[$class][$var] = null;
         }
+
         return $properties[$class][$var];
     }
 
-    // }}}
-    // {{{ registerShutdownFunc()
-
     /**
     * Use this function to register a shutdown method for static
     * classes.
@@ -262,9 +236,6 @@ class PEAR
         $GLOBALS['_PEAR_shutdown_funcs'][] = array($func, $args);
     }
 
-    // }}}
-    // {{{ isError()
-
     /**
      * Tell whether a value is a PEAR error.
      *
@@ -276,22 +247,20 @@ class PEAR
      * @access  public
      * @return  bool    true if parameter is an error
      */
-    static function isError($data, $code = null)
+    function isError($data, $code = null)
     {
-        if ($data instanceof PEAR_Error) {
-            if (is_null($code)) {
-                return true;
-            } elseif (is_string($code)) {
-                return $data->getMessage() == $code;
-            } else {
-                return $data->getCode() == $code;
-            }
+        if (!is_a($data, 'PEAR_Error')) {
+            return false;
+        }
+
+        if (is_null($code)) {
+            return true;
+        } elseif (is_string($code)) {
+            return $data->getMessage() == $code;
         }
-        return false;
-    }
 
-    // }}}
-    // {{{ setErrorHandling()
+        return $data->getCode() == $code;
+    }
 
     /**
      * Sets how errors generated by this object should be handled.
@@ -331,7 +300,6 @@ class PEAR
      *
      * @since PHP 4.0.5
      */
-
     function setErrorHandling($mode = null, $options = null)
     {
         if (isset($this) && is_a($this, 'PEAR')) {
@@ -369,9 +337,6 @@ class PEAR
         }
     }
 
-    // }}}
-    // {{{ expectError()
-
     /**
      * This method is used to tell which errors you expect to get.
      * Expected errors are always returned with error mode
@@ -394,12 +359,9 @@ class PEAR
         } else {
             array_push($this->_expected_errors, array($code));
         }
-        return sizeof($this->_expected_errors);
+        return count($this->_expected_errors);
     }
 
-    // }}}
-    // {{{ popExpect()
-
     /**
      * This method pops one element off the expected error codes
      * stack.
@@ -411,9 +373,6 @@ class PEAR
         return array_pop($this->_expected_errors);
     }
 
-    // }}}
-    // {{{ _checkDelExpect()
-
     /**
      * This method checks unsets an error code if available
      *
@@ -425,8 +384,7 @@ class PEAR
     function _checkDelExpect($error_code)
     {
         $deleted = false;
-
-        foreach ($this->_expected_errors AS $key => $error_array) {
+        foreach ($this->_expected_errors as $key => $error_array) {
             if (in_array($error_code, $error_array)) {
                 unset($this->_expected_errors[$key][array_search($error_code, $error_array)]);
                 $deleted = true;
@@ -437,12 +395,10 @@ class PEAR
                 unset($this->_expected_errors[$key]);
             }
         }
+
         return $deleted;
     }
 
-    // }}}
-    // {{{ delExpect()
-
     /**
      * This method deletes all occurences of the specified element from
      * the expected error codes stack.
@@ -455,34 +411,26 @@ class PEAR
     function delExpect($error_code)
     {
         $deleted = false;
-
         if ((is_array($error_code) && (0 != count($error_code)))) {
-            // $error_code is a non-empty array here;
-            // we walk through it trying to unset all
-            // values
-            foreach($error_code as $key => $error) {
-                if ($this->_checkDelExpect($error)) {
-                    $deleted =  true;
-                } else {
-                    $deleted = false;
-                }
+            // $error_code is a non-empty array here; we walk through it trying
+            // to unset all values
+            foreach ($error_code as $key => $error) {
+                $deleted =  $this->_checkDelExpect($error) ? true : false;
             }
+
             return $deleted ? true : PEAR::raiseError("The expected error you submitted does not exist"); // IMPROVE ME
         } elseif (!empty($error_code)) {
             // $error_code comes alone, trying to unset it
             if ($this->_checkDelExpect($error_code)) {
                 return true;
-            } else {
-                return PEAR::raiseError("The expected error you submitted does not exist"); // IMPROVE ME
             }
-        } else {
-            // $error_code is empty
-            return PEAR::raiseError("The expected error you submitted is empty"); // IMPROVE ME
+
+            return PEAR::raiseError("The expected error you submitted does not exist"); // IMPROVE ME
         }
-    }
 
-    // }}}
-    // {{{ raiseError()
+        // $error_code is empty
+        return PEAR::raiseError("The expected error you submitted is empty"); // IMPROVE ME
+    }
 
     /**
      * This method is a wrapper that returns an instance of the
@@ -521,7 +469,7 @@ class PEAR
      * @see PEAR::setErrorHandling
      * @since PHP 4.0.5
      */
-    static function &raiseError($message = null,
+    function &raiseError($message = null,
                          $code = null,
                          $mode = null,
                          $options = null,
@@ -538,13 +486,20 @@ class PEAR
             $message     = $message->getMessage();
         }
 
-        if (isset($this) && isset($this->_expected_errors) && sizeof($this->_expected_errors) > 0 && sizeof($exp = end($this->_expected_errors))) {
+        if (
+            isset($this) &&
+            isset($this->_expected_errors) &&
+            count($this->_expected_errors) > 0 &&
+            count($exp = end($this->_expected_errors))
+        ) {
             if ($exp[0] == "*" ||
                 (is_int(reset($exp)) && in_array($code, $exp)) ||
-                (is_string(reset($exp)) && in_array($message, $exp))) {
+                (is_string(reset($exp)) && in_array($message, $exp))
+            ) {
                 $mode = PEAR_ERROR_RETURN;
             }
         }
+
         // No mode given, try global ones
         if ($mode === null) {
             // Class error handler
@@ -565,42 +520,52 @@ class PEAR
         } else {
             $ec = 'PEAR_Error';
         }
+
+        if (intval(PHP_VERSION) < 5) {
+            // little non-eval hack to fix bug #12147
+            include 'PEAR/FixPHP5PEARWarnings.php';
+            return $a;
+        }
+
         if ($skipmsg) {
             $a = new $ec($code, $mode, $options, $userinfo);
-            return $a;
         } else {
             $a = new $ec($message, $code, $mode, $options, $userinfo);
-            return $a;
         }
-    }
 
-    // }}}
-    // {{{ throwError()
+        return $a;
+    }
 
     /**
      * Simpler form of raiseError with fewer options.  In most cases
      * message, code and userinfo are enough.
      *
-     * @param string $message
+     * @param mixed $message a text error message or a PEAR error object
+     *
+     * @param int $code      a numeric error code (it is up to your class
+     *                  to define these if you want to use codes)
      *
+     * @param string $userinfo If you need to pass along for example debug
+     *                  information, this parameter is meant for that.
+     *
+     * @access public
+     * @return object   a PEAR error object
+     * @see PEAR::raiseError
      */
-    function &throwError($message = null,
-                         $code = null,
-                         $userinfo = null)
+    function &throwError($message = null, $code = null, $userinfo = null)
     {
         if (isset($this) && is_a($this, 'PEAR')) {
             $a = &$this->raiseError($message, $code, null, null, $userinfo);
             return $a;
-        } else {
-            $a = &PEAR::raiseError($message, $code, null, null, $userinfo);
-            return $a;
         }
+
+        $a = &PEAR::raiseError($message, $code, null, null, $userinfo);
+        return $a;
     }
 
-    // }}}
     function staticPushErrorHandling($mode, $options = null)
     {
-        $stack = &$GLOBALS['_PEAR_error_handler_stack'];
+        $stack       = &$GLOBALS['_PEAR_error_handler_stack'];
         $def_mode    = &$GLOBALS['_PEAR_default_error_mode'];
         $def_options = &$GLOBALS['_PEAR_default_error_options'];
         $stack[] = array($def_mode, $def_options);
@@ -669,8 +634,6 @@ class PEAR
         return true;
     }
 
-    // {{{ pushErrorHandling()
-
     /**
      * Push a new error handler on top of the error handler options stack. With this
      * you can easily override the actual error handler for some code and restore
@@ -704,9 +667,6 @@ class PEAR
         return true;
     }
 
-    // }}}
-    // {{{ popErrorHandling()
-
     /**
     * Pop the last error handler used
     *
@@ -728,9 +688,6 @@ class PEAR
         return true;
     }
 
-    // }}}
-    // {{{ loadExtension()
-
     /**
     * OS independant PHP extension load. Remember to take care
     * on the correct extension name for case sensitive OSes.
@@ -740,31 +697,38 @@ class PEAR
     */
     function loadExtension($ext)
     {
-        if (!extension_loaded($ext)) {
-            // if either returns true dl() will produce a FATAL error, stop that
-            if ((ini_get('enable_dl') != 1) || (ini_get('safe_mode') == 1)) {
-                return false;
-            }
-            if (OS_WINDOWS) {
-                $suffix = '.dll';
-            } elseif (PHP_OS == 'HP-UX') {
-                $suffix = '.sl';
-            } elseif (PHP_OS == 'AIX') {
-                $suffix = '.a';
-            } elseif (PHP_OS == 'OSX') {
-                $suffix = '.bundle';
-            } else {
-                $suffix = '.so';
-            }
-            return @dl('php_'.$ext.$suffix) || @dl($ext.$suffix);
+        if (extension_loaded($ext)) {
+            return true;
+        }
+
+        // if either returns true dl() will produce a FATAL error, stop that
+        if (
+            function_exists('dl') === false ||
+            ini_get('enable_dl') != 1 ||
+            ini_get('safe_mode') == 1
+        ) {
+            return false;
         }
-        return true;
-    }
 
-    // }}}
+        if (OS_WINDOWS) {
+            $suffix = '.dll';
+        } elseif (PHP_OS == 'HP-UX') {
+            $suffix = '.sl';
+        } elseif (PHP_OS == 'AIX') {
+            $suffix = '.a';
+        } elseif (PHP_OS == 'OSX') {
+            $suffix = '.bundle';
+        } else {
+            $suffix = '.so';
+        }
+
+        return @dl('php_'.$ext.$suffix) || @dl($ext.$suffix);
+    }
 }
 
-// {{{ _PEAR_call_destructors()
+if (PEAR_ZE2) {
+    include_once 'PEAR5.php';
+}
 
 function _PEAR_call_destructors()
 {
@@ -773,9 +737,16 @@ function _PEAR_call_destructors()
         sizeof($_PEAR_destructor_object_list))
     {
         reset($_PEAR_destructor_object_list);
-        if (PEAR::getStaticProperty('PEAR', 'destructlifo')) {
+        if (PEAR_ZE2) {
+            $destructLifoExists = PEAR5::getStaticProperty('PEAR', 'destructlifo');
+        } else {
+            $destructLifoExists = PEAR::getStaticProperty('PEAR', 'destructlifo');
+        }
+
+        if ($destructLifoExists) {
             $_PEAR_destructor_object_list = array_reverse($_PEAR_destructor_object_list);
         }
+
         while (list($k, $objref) = each($_PEAR_destructor_object_list)) {
             $classname = get_class($objref);
             while ($classname) {
@@ -794,14 +765,17 @@ function _PEAR_call_destructors()
     }
 
     // Now call the shutdown functions
-    if (is_array($GLOBALS['_PEAR_shutdown_funcs']) AND !empty($GLOBALS['_PEAR_shutdown_funcs'])) {
+    if (
+        isset($GLOBALS['_PEAR_shutdown_funcs']) &&
+        is_array($GLOBALS['_PEAR_shutdown_funcs']) &&
+        !empty($GLOBALS['_PEAR_shutdown_funcs'])
+    ) {
         foreach ($GLOBALS['_PEAR_shutdown_funcs'] as $value) {
             call_user_func_array($value[0], $value[1]);
         }
     }
 }
 
-// }}}
 /**
  * Standard PEAR error class for PHP 4
  *
@@ -813,16 +787,14 @@ function _PEAR_call_destructors()
  * @author     Tomas V.V. Cox <cox@idecnet.com>
  * @author     Gregory Beaver <cellog@php.net>
  * @copyright  1997-2006 The PHP Group
- * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
- * @version    Release: 1.6.1
+ * @license    http://opensource.org/licenses/bsd-license.php New BSD License
+ * @version    Release: 1.9.1
  * @link       http://pear.php.net/manual/en/core.pear.pear-error.php
  * @see        PEAR::raiseError(), PEAR::throwError()
  * @since      Class available since PHP 4.0.2
  */
 class PEAR_Error
 {
-    // {{{ properties
-
     var $error_message_prefix = '';
     var $mode                 = PEAR_ERROR_RETURN;
     var $level                = E_USER_NOTICE;
@@ -831,9 +803,6 @@ class PEAR_Error
     var $userinfo             = '';
     var $backtrace            = null;
 
-    // }}}
-    // {{{ constructor
-
     /**
      * PEAR_Error constructor
      *
@@ -864,12 +833,20 @@ class PEAR_Error
         $this->code      = $code;
         $this->mode      = $mode;
         $this->userinfo  = $userinfo;
-        if (!PEAR::getStaticProperty('PEAR_Error', 'skiptrace')) {
+
+        if (PEAR_ZE2) {
+            $skiptrace = PEAR5::getStaticProperty('PEAR_Error', 'skiptrace');
+        } else {
+            $skiptrace = PEAR::getStaticProperty('PEAR_Error', 'skiptrace');
+        }
+
+        if (!$skiptrace) {
             $this->backtrace = debug_backtrace();
             if (isset($this->backtrace[0]) && isset($this->backtrace[0]['object'])) {
                 unset($this->backtrace[0]['object']);
             }
         }
+
         if ($mode & PEAR_ERROR_CALLBACK) {
             $this->level = E_USER_NOTICE;
             $this->callback = $options;
@@ -877,20 +854,25 @@ class PEAR_Error
             if ($options === null) {
                 $options = E_USER_NOTICE;
             }
+
             $this->level = $options;
             $this->callback = null;
         }
+
         if ($this->mode & PEAR_ERROR_PRINT) {
             if (is_null($options) || is_int($options)) {
                 $format = "%s";
             } else {
                 $format = $options;
             }
+
             printf($format, $this->getMessage());
         }
+
         if ($this->mode & PEAR_ERROR_TRIGGER) {
             trigger_error($this->getMessage(), $this->level);
         }
+
         if ($this->mode & PEAR_ERROR_DIE) {
             $msg = $this->getMessage();
             if (is_null($options) || is_int($options)) {
@@ -903,47 +885,39 @@ class PEAR_Error
             }
             die(sprintf($format, $msg));
         }
-        if ($this->mode & PEAR_ERROR_CALLBACK) {
-            if (is_callable($this->callback)) {
-                call_user_func($this->callback, $this);
-            }
+
+        if ($this->mode & PEAR_ERROR_CALLBACK && is_callable($this->callback)) {
+            call_user_func($this->callback, $this);
         }
+
         if ($this->mode & PEAR_ERROR_EXCEPTION) {
             trigger_error("PEAR_ERROR_EXCEPTION is obsolete, use class PEAR_Exception for exceptions", E_USER_WARNING);
             eval('$e = new Exception($this->message, $this->code);throw($e);');
         }
     }
 
-    // }}}
-    // {{{ getMode()
-
     /**
      * Get the error mode from an error object.
      *
      * @return int error mode
      * @access public
      */
-    function getMode() {
+    function getMode()
+    {
         return $this->mode;
     }
 
-    // }}}
-    // {{{ getCallback()
-
     /**
      * Get the callback function/method from an error object.
      *
      * @return mixed callback function or object/method array
      * @access public
      */
-    function getCallback() {
+    function getCallback()
+    {
         return $this->callback;
     }
 
-    // }}}
-    // {{{ getMessage()
-
-
     /**
      * Get the error message from an error object.
      *
@@ -955,10 +929,6 @@ class PEAR_Error
         return ($this->error_message_prefix . $this->message);
     }
 
-
-    // }}}
-    // {{{ getCode()
-
     /**
      * Get error code from an error object
      *
@@ -970,9 +940,6 @@ class PEAR_Error
         return $this->code;
      }
 
-    // }}}
-    // {{{ getType()
-
     /**
      * Get the name of this error/exception.
      *
@@ -984,9 +951,6 @@ class PEAR_Error
         return get_class($this);
     }
 
-    // }}}
-    // {{{ getUserInfo()
-
     /**
      * Get additional user-supplied information.
      *
@@ -998,9 +962,6 @@ class PEAR_Error
         return $this->userinfo;
     }
 
-    // }}}
-    // {{{ getDebugInfo()
-
     /**
      * Get additional debug information supplied by the application.
      *
@@ -1012,9 +973,6 @@ class PEAR_Error
         return $this->getUserInfo();
     }
 
-    // }}}
-    // {{{ getBacktrace()
-
     /**
      * Get the call backtrace from where the error was generated.
      * Supported with PHP 4.3.0 or newer.
@@ -1034,9 +992,6 @@ class PEAR_Error
         return $this->backtrace[$frame];
     }
 
-    // }}}
-    // {{{ addUserInfo()
-
     function addUserInfo($info)
     {
         if (empty($this->userinfo)) {
@@ -1046,8 +1001,10 @@ class PEAR_Error
         }
     }
 
-    // }}}
-    // {{{ toString()
+    function __toString()
+    {
+        return $this->getMessage();
+    }
 
     /**
      * Make a string representation of this object.
@@ -1055,7 +1012,8 @@ class PEAR_Error
      * @return string a string with an object summary
      * @access public
      */
-    function toString() {
+    function toString()
+    {
         $modes = array();
         $levels = array(E_USER_NOTICE  => 'notice',
                         E_USER_WARNING => 'warning',
@@ -1094,8 +1052,6 @@ class PEAR_Error
                        $this->error_message_prefix,
                        $this->userinfo);
     }
-
-    // }}}
 }
 
 /*
@@ -1105,4 +1061,3 @@ class PEAR_Error
  * c-basic-offset: 4
  * End:
  */
-?>
diff --git a/libs/PEAR/Exception.php b/libs/PEAR/Exception.php
new file mode 100644
index 0000000000000000000000000000000000000000..77743ef210b5954773929932ad1a6e65149de154
--- /dev/null
+++ b/libs/PEAR/Exception.php
@@ -0,0 +1,389 @@
+<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 foldmethod=marker: */
+/**
+ * PEAR_Exception
+ *
+ * PHP versions 4 and 5
+ *
+ * @category   pear
+ * @package    PEAR
+ * @author     Tomas V. V. Cox <cox@idecnet.com>
+ * @author     Hans Lellelid <hans@velum.net>
+ * @author     Bertrand Mansion <bmansion@mamasam.com>
+ * @author     Greg Beaver <cellog@php.net>
+ * @copyright  1997-2009 The Authors
+ * @license    http://opensource.org/licenses/bsd-license.php New BSD License
+ * @version    CVS: $Id: Exception.php 296939 2010-03-27 16:24:43Z dufuz $
+ * @link       http://pear.php.net/package/PEAR
+ * @since      File available since Release 1.3.3
+ */
+
+
+/**
+ * Base PEAR_Exception Class
+ *
+ * 1) Features:
+ *
+ * - Nestable exceptions (throw new PEAR_Exception($msg, $prev_exception))
+ * - Definable triggers, shot when exceptions occur
+ * - Pretty and informative error messages
+ * - Added more context info available (like class, method or cause)
+ * - cause can be a PEAR_Exception or an array of mixed
+ *   PEAR_Exceptions/PEAR_ErrorStack warnings
+ * - callbacks for specific exception classes and their children
+ *
+ * 2) Ideas:
+ *
+ * - Maybe a way to define a 'template' for the output
+ *
+ * 3) Inherited properties from PHP Exception Class:
+ *
+ * protected $message
+ * protected $code
+ * protected $line
+ * protected $file
+ * private   $trace
+ *
+ * 4) Inherited methods from PHP Exception Class:
+ *
+ * __clone
+ * __construct
+ * getMessage
+ * getCode
+ * getFile
+ * getLine
+ * getTraceSafe
+ * getTraceSafeAsString
+ * __toString
+ *
+ * 5) Usage example
+ *
+ * <code>
+ *  require_once 'PEAR/Exception.php';
+ *
+ *  class Test {
+ *     function foo() {
+ *         throw new PEAR_Exception('Error Message', ERROR_CODE);
+ *     }
+ *  }
+ *
+ *  function myLogger($pear_exception) {
+ *     echo $pear_exception->getMessage();
+ *  }
+ *  // each time a exception is thrown the 'myLogger' will be called
+ *  // (its use is completely optional)
+ *  PEAR_Exception::addObserver('myLogger');
+ *  $test = new Test;
+ *  try {
+ *     $test->foo();
+ *  } catch (PEAR_Exception $e) {
+ *     print $e;
+ *  }
+ * </code>
+ *
+ * @category   pear
+ * @package    PEAR
+ * @author     Tomas V.V.Cox <cox@idecnet.com>
+ * @author     Hans Lellelid <hans@velum.net>
+ * @author     Bertrand Mansion <bmansion@mamasam.com>
+ * @author     Greg Beaver <cellog@php.net>
+ * @copyright  1997-2009 The Authors
+ * @license    http://opensource.org/licenses/bsd-license.php New BSD License
+ * @version    Release: 1.9.1
+ * @link       http://pear.php.net/package/PEAR
+ * @since      Class available since Release 1.3.3
+ *
+ */
+class PEAR_Exception extends Exception
+{
+    const OBSERVER_PRINT = -2;
+    const OBSERVER_TRIGGER = -4;
+    const OBSERVER_DIE = -8;
+    protected $cause;
+    private static $_observers = array();
+    private static $_uniqueid = 0;
+    private $_trace;
+
+    /**
+     * Supported signatures:
+     *  - PEAR_Exception(string $message);
+     *  - PEAR_Exception(string $message, int $code);
+     *  - PEAR_Exception(string $message, Exception $cause);
+     *  - PEAR_Exception(string $message, Exception $cause, int $code);
+     *  - PEAR_Exception(string $message, PEAR_Error $cause);
+     *  - PEAR_Exception(string $message, PEAR_Error $cause, int $code);
+     *  - PEAR_Exception(string $message, array $causes);
+     *  - PEAR_Exception(string $message, array $causes, int $code);
+     * @param string exception message
+     * @param int|Exception|PEAR_Error|array|null exception cause
+     * @param int|null exception code or null
+     */
+    public function __construct($message, $p2 = null, $p3 = null)
+    {
+        if (is_int($p2)) {
+            $code = $p2;
+            $this->cause = null;
+        } elseif (is_object($p2) || is_array($p2)) {
+            // using is_object allows both Exception and PEAR_Error
+            if (is_object($p2) && !($p2 instanceof Exception)) {
+                if (!class_exists('PEAR_Error') || !($p2 instanceof PEAR_Error)) {
+                    throw new PEAR_Exception('exception cause must be Exception, ' .
+                        'array, or PEAR_Error');
+                }
+            }
+            $code = $p3;
+            if (is_array($p2) && isset($p2['message'])) {
+                // fix potential problem of passing in a single warning
+                $p2 = array($p2);
+            }
+            $this->cause = $p2;
+        } else {
+            $code = null;
+            $this->cause = null;
+        }
+        parent::__construct($message, $code);
+        $this->signal();
+    }
+
+    /**
+     * @param mixed $callback  - A valid php callback, see php func is_callable()
+     *                         - A PEAR_Exception::OBSERVER_* constant
+     *                         - An array(const PEAR_Exception::OBSERVER_*,
+     *                           mixed $options)
+     * @param string $label    The name of the observer. Use this if you want
+     *                         to remove it later with removeObserver()
+     */
+    public static function addObserver($callback, $label = 'default')
+    {
+        self::$_observers[$label] = $callback;
+    }
+
+    public static function removeObserver($label = 'default')
+    {
+        unset(self::$_observers[$label]);
+    }
+
+    /**
+     * @return int unique identifier for an observer
+     */
+    public static function getUniqueId()
+    {
+        return self::$_uniqueid++;
+    }
+
+    private function signal()
+    {
+        foreach (self::$_observers as $func) {
+            if (is_callable($func)) {
+                call_user_func($func, $this);
+                continue;
+            }
+            settype($func, 'array');
+            switch ($func[0]) {
+                case self::OBSERVER_PRINT :
+                    $f = (isset($func[1])) ? $func[1] : '%s';
+                    printf($f, $this->getMessage());
+                    break;
+                case self::OBSERVER_TRIGGER :
+                    $f = (isset($func[1])) ? $func[1] : E_USER_NOTICE;
+                    trigger_error($this->getMessage(), $f);
+                    break;
+                case self::OBSERVER_DIE :
+                    $f = (isset($func[1])) ? $func[1] : '%s';
+                    die(printf($f, $this->getMessage()));
+                    break;
+                default:
+                    trigger_error('invalid observer type', E_USER_WARNING);
+            }
+        }
+    }
+
+    /**
+     * Return specific error information that can be used for more detailed
+     * error messages or translation.
+     *
+     * This method may be overridden in child exception classes in order
+     * to add functionality not present in PEAR_Exception and is a placeholder
+     * to define API
+     *
+     * The returned array must be an associative array of parameter => value like so:
+     * <pre>
+     * array('name' => $name, 'context' => array(...))
+     * </pre>
+     * @return array
+     */
+    public function getErrorData()
+    {
+        return array();
+    }
+
+    /**
+     * Returns the exception that caused this exception to be thrown
+     * @access public
+     * @return Exception|array The context of the exception
+     */
+    public function getCause()
+    {
+        return $this->cause;
+    }
+
+    /**
+     * Function must be public to call on caused exceptions
+     * @param array
+     */
+    public function getCauseMessage(&$causes)
+    {
+        $trace = $this->getTraceSafe();
+        $cause = array('class'   => get_class($this),
+                       'message' => $this->message,
+                       'file' => 'unknown',
+                       'line' => 'unknown');
+        if (isset($trace[0])) {
+            if (isset($trace[0]['file'])) {
+                $cause['file'] = $trace[0]['file'];
+                $cause['line'] = $trace[0]['line'];
+            }
+        }
+        $causes[] = $cause;
+        if ($this->cause instanceof PEAR_Exception) {
+            $this->cause->getCauseMessage($causes);
+        } elseif ($this->cause instanceof Exception) {
+            $causes[] = array('class'   => get_class($this->cause),
+                              'message' => $this->cause->getMessage(),
+                              'file' => $this->cause->getFile(),
+                              'line' => $this->cause->getLine());
+        } elseif (class_exists('PEAR_Error') && $this->cause instanceof PEAR_Error) {
+            $causes[] = array('class' => get_class($this->cause),
+                              'message' => $this->cause->getMessage(),
+                              'file' => 'unknown',
+                              'line' => 'unknown');
+        } elseif (is_array($this->cause)) {
+            foreach ($this->cause as $cause) {
+                if ($cause instanceof PEAR_Exception) {
+                    $cause->getCauseMessage($causes);
+                } elseif ($cause instanceof Exception) {
+                    $causes[] = array('class'   => get_class($cause),
+                                   'message' => $cause->getMessage(),
+                                   'file' => $cause->getFile(),
+                                   'line' => $cause->getLine());
+                } elseif (class_exists('PEAR_Error') && $cause instanceof PEAR_Error) {
+                    $causes[] = array('class' => get_class($cause),
+                                      'message' => $cause->getMessage(),
+                                      'file' => 'unknown',
+                                      'line' => 'unknown');
+                } elseif (is_array($cause) && isset($cause['message'])) {
+                    // PEAR_ErrorStack warning
+                    $causes[] = array(
+                        'class' => $cause['package'],
+                        'message' => $cause['message'],
+                        'file' => isset($cause['context']['file']) ?
+                                            $cause['context']['file'] :
+                                            'unknown',
+                        'line' => isset($cause['context']['line']) ?
+                                            $cause['context']['line'] :
+                                            'unknown',
+                    );
+                }
+            }
+        }
+    }
+
+    public function getTraceSafe()
+    {
+        if (!isset($this->_trace)) {
+            $this->_trace = $this->getTrace();
+            if (empty($this->_trace)) {
+                $backtrace = debug_backtrace();
+                $this->_trace = array($backtrace[count($backtrace)-1]);
+            }
+        }
+        return $this->_trace;
+    }
+
+    public function getErrorClass()
+    {
+        $trace = $this->getTraceSafe();
+        return $trace[0]['class'];
+    }
+
+    public function getErrorMethod()
+    {
+        $trace = $this->getTraceSafe();
+        return $trace[0]['function'];
+    }
+
+    public function __toString()
+    {
+        if (isset($_SERVER['REQUEST_URI'])) {
+            return $this->toHtml();
+        }
+        return $this->toText();
+    }
+
+    public function toHtml()
+    {
+        $trace = $this->getTraceSafe();
+        $causes = array();
+        $this->getCauseMessage($causes);
+        $html =  '<table style="border: 1px" cellspacing="0">' . "\n";
+        foreach ($causes as $i => $cause) {
+            $html .= '<tr><td colspan="3" style="background: #ff9999">'
+               . str_repeat('-', $i) . ' <b>' . $cause['class'] . '</b>: '
+               . htmlspecialchars($cause['message']) . ' in <b>' . $cause['file'] . '</b> '
+               . 'on line <b>' . $cause['line'] . '</b>'
+               . "</td></tr>\n";
+        }
+        $html .= '<tr><td colspan="3" style="background-color: #aaaaaa; text-align: center; font-weight: bold;">Exception trace</td></tr>' . "\n"
+               . '<tr><td style="text-align: center; background: #cccccc; width:20px; font-weight: bold;">#</td>'
+               . '<td style="text-align: center; background: #cccccc; font-weight: bold;">Function</td>'
+               . '<td style="text-align: center; background: #cccccc; font-weight: bold;">Location</td></tr>' . "\n";
+
+        foreach ($trace as $k => $v) {
+            $html .= '<tr><td style="text-align: center;">' . $k . '</td>'
+                   . '<td>';
+            if (!empty($v['class'])) {
+                $html .= $v['class'] . $v['type'];
+            }
+            $html .= $v['function'];
+            $args = array();
+            if (!empty($v['args'])) {
+                foreach ($v['args'] as $arg) {
+                    if (is_null($arg)) $args[] = 'null';
+                    elseif (is_array($arg)) $args[] = 'Array';
+                    elseif (is_object($arg)) $args[] = 'Object('.get_class($arg).')';
+                    elseif (is_bool($arg)) $args[] = $arg ? 'true' : 'false';
+                    elseif (is_int($arg) || is_double($arg)) $args[] = $arg;
+                    else {
+                        $arg = (string)$arg;
+                        $str = htmlspecialchars(substr($arg, 0, 16));
+                        if (strlen($arg) > 16) $str .= '&hellip;';
+                        $args[] = "'" . $str . "'";
+                    }
+                }
+            }
+            $html .= '(' . implode(', ',$args) . ')'
+                   . '</td>'
+                   . '<td>' . (isset($v['file']) ? $v['file'] : 'unknown')
+                   . ':' . (isset($v['line']) ? $v['line'] : 'unknown')
+                   . '</td></tr>' . "\n";
+        }
+        $html .= '<tr><td style="text-align: center;">' . ($k+1) . '</td>'
+               . '<td>{main}</td>'
+               . '<td>&nbsp;</td></tr>' . "\n"
+               . '</table>';
+        return $html;
+    }
+
+    public function toText()
+    {
+        $causes = array();
+        $this->getCauseMessage($causes);
+        $causeMsg = '';
+        foreach ($causes as $i => $cause) {
+            $causeMsg .= str_repeat(' ', $i) . $cause['class'] . ': '
+                   . $cause['message'] . ' in ' . $cause['file']
+                   . ' on line ' . $cause['line'] . "\n";
+        }
+        return $causeMsg . $this->getTraceAsString();
+    }
+}
\ No newline at end of file