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vendor/PEAR.php

+<?php
+/**
+ * PEAR, the PHP Extension and Application Repository
+ *
+ * PEAR class and PEAR_Error class
+ *
+ * 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
+ * @version    CVS: $Id: PEAR.php,v 1.101 2006/04/25 02:41:03 cellog Exp $
+ * @link       http://pear.php.net/package/PEAR
+ * @since      File available since Release 0.1
+ */
+
+/**#@+
+ * ERROR constants
+ */
+define('PEAR_ERROR_RETURN',     1);
+define('PEAR_ERROR_PRINT',      2);
+define('PEAR_ERROR_TRIGGER',    4);
+define('PEAR_ERROR_DIE',        8);
+define('PEAR_ERROR_CALLBACK',  16);
+/**
+ * WARNING: obsolete
+ * @deprecated
+ */
+define('PEAR_ERROR_EXCEPTION', 32);
+/**#@-*/
+define('PEAR_ZE2', (function_exists('version_compare') &&
+                    version_compare(zend_version(), "2-dev", "ge")));
+
+if (substr(PHP_OS, 0, 3) == 'WIN') {
+    define('OS_WINDOWS', true);
+    define('OS_UNIX',    false);
+    define('PEAR_OS',    'Windows');
+} else {
+    define('OS_WINDOWS', false);
+    define('OS_UNIX',    true);
+    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;
+$GLOBALS['_PEAR_destructor_object_list'] = array();
+$GLOBALS['_PEAR_shutdown_funcs']         = array();
+$GLOBALS['_PEAR_error_handler_stack']    = array();
+
+@ini_set('track_errors', true);
+
+/**
+ * Base class for other PEAR classes.  Provides rudimentary
+ * emulation of destructors.
+ *
+ * If you want a destructor in your class, inherit PEAR and make a
+ * destructor method called _yourclassname (same name as the
+ * constructor, but with a "_" prefix).  Also, in your constructor you
+ * have to call the PEAR constructor: $this->PEAR();.
+ * The destructor method will be called without parameters.  Note that
+ * at in some SAPI implementations (such as Apache), any output during
+ * the request shutdown (in which destructors are called) seems to be
+ * discarded.  If you need to get any debug information from your
+ * destructor, use error_log(), syslog() or something similar.
+ *
+ * IMPORTANT! To use the emulated destructors you need to create the
+ * objects by reference: $obj =& new PEAR_child;
+ *
+ * @category   pear
+ * @package    PEAR
+ * @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
+ * @version    Release: 1.5.0
+ * @link       http://pear.php.net/package/PEAR
+ * @see        PEAR_Error
+ * @since      Class available since PHP 4.0.2
+ * @link        http://pear.php.net/manual/en/core.pear.php#core.pear.pear
+ */
+class PEAR
+{
+    // {{{ properties
+
+    /**
+     * Whether to enable internal debug messages.
+     *
+     * @var     bool
+     * @access  private
+     */
+    var $_debug = false;
+
+    /**
+     * Default error mode for this object.
+     *
+     * @var     int
+     * @access  private
+     */
+    var $_default_error_mode = null;
+
+    /**
+     * Default error options used for this object when error mode
+     * is PEAR_ERROR_TRIGGER.
+     *
+     * @var     int
+     * @access  private
+     */
+    var $_default_error_options = null;
+
+    /**
+     * Default error handler (callback) for this object, if error mode is
+     * PEAR_ERROR_CALLBACK.
+     *
+     * @var     string
+     * @access  private
+     */
+    var $_default_error_handler = '';
+
+    /**
+     * Which class to use for error objects.
+     *
+     * @var     string
+     * @access  private
+     */
+    var $_error_class = 'PEAR_Error';
+
+    /**
+     * An array of expected errors.
+     *
+     * @var     array
+     * @access  private
+     */
+    var $_expected_errors = array();
+
+    // }}}
+
+    // {{{ constructor
+
+    /**
+     * Constructor.  Registers this object in
+     * $_PEAR_destructor_object_list for destructor emulation if a
+     * destructor object exists.
+     *
+     * @param string $error_class  (optional) which class to use for
+     *        error objects, defaults to PEAR_Error.
+     * @access public
+     * @return void
+     */
+    function PEAR($error_class = null)
+    {
+        $classname = strtolower(get_class($this));
+        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)) {
+                global $_PEAR_destructor_object_list;
+                $_PEAR_destructor_object_list[] = &$this;
+                if (!isset($GLOBALS['_PEAR_SHUTDOWN_REGISTERED'])) {
+                    register_shutdown_function("_PEAR_call_destructors");
+                    $GLOBALS['_PEAR_SHUTDOWN_REGISTERED'] = true;
+                }
+                break;
+            } else {
+                $classname = get_parent_class($classname);
+            }
+        }
+    }
+
+    // }}}
+    // {{{ destructor
+
+    /**
+     * Destructor (the emulated type of...).  Does nothing right now,
+     * but is included for forward compatibility, so subclass
+     * destructors should always call it.
+     *
+     * See the note in the class desciption about output from
+     * destructors.
+     *
+     * @access public
+     * @return void
+     */
+    function _PEAR() {
+        if ($this->_debug) {
+            printf("PEAR destructor called, class=%s\n", strtolower(get_class($this)));
+        }
+    }
+
+    // }}}
+    // {{{ 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)
+    * do this: $myVar = &PEAR::getStaticProperty('myclass', 'myVar');
+    * You MUST use a reference, or they will not persist!
+    *
+    * @access public
+    * @param  string $class  The calling classname, to prevent clashes
+    * @param  string $var    The variable to retrieve.
+    * @return mixed   A reference to the variable. If not set it will be
+    *                 auto initialised to NULL.
+    */
+    function &getStaticProperty($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.
+    *
+    * @access public
+    * @param  mixed $func  The function name (or array of class/method) to call
+    * @param  mixed $args  The arguments to pass to the function
+    * @return void
+    */
+    function registerShutdownFunc($func, $args = array())
+    {
+        // if we are called statically, there is a potential
+        // that no shutdown func is registered.  Bug #6445
+        if (!isset($GLOBALS['_PEAR_SHUTDOWN_REGISTERED'])) {
+            register_shutdown_function("_PEAR_call_destructors");
+            $GLOBALS['_PEAR_SHUTDOWN_REGISTERED'] = true;
+        }
+        $GLOBALS['_PEAR_shutdown_funcs'][] = array($func, $args);
+    }
+
+    // }}}
+    // {{{ isError()
+
+    /**
+     * Tell whether a value is a PEAR error.
+     *
+     * @param   mixed $data   the value to test
+     * @param   int   $code   if $data is an error object, return true
+     *                        only if $code is a string and
+     *                        $obj->getMessage() == $code or
+     *                        $code is an integer and $obj->getCode() == $code
+     * @access  public
+     * @return  bool    true if parameter is an error
+     */
+    function isError($data, $code = null)
+    {
+        if (is_a($data, 'PEAR_Error')) {
+            if (is_null($code)) {
+                return true;
+            } elseif (is_string($code)) {
+                return $data->getMessage() == $code;
+            } else {
+                return $data->getCode() == $code;
+            }
+        }
+        return false;
+    }
+
+    // }}}
+    // {{{ setErrorHandling()
+
+    /**
+     * Sets how errors generated by this object should be handled.
+     * Can be invoked both in objects and statically.  If called
+     * statically, setErrorHandling sets the default behaviour for all
+     * PEAR objects.  If called in an object, setErrorHandling sets
+     * the default behaviour for that object.
+     *
+     * @param int $mode
+     *        One of PEAR_ERROR_RETURN, PEAR_ERROR_PRINT,
+     *        PEAR_ERROR_TRIGGER, PEAR_ERROR_DIE,
+     *        PEAR_ERROR_CALLBACK or PEAR_ERROR_EXCEPTION.
+     *
+     * @param mixed $options
+     *        When $mode is PEAR_ERROR_TRIGGER, this is the error level (one
+     *        of E_USER_NOTICE, E_USER_WARNING or E_USER_ERROR).
+     *
+     *        When $mode is PEAR_ERROR_CALLBACK, this parameter is expected
+     *        to be the callback function or method.  A callback
+     *        function is a string with the name of the function, a
+     *        callback method is an array of two elements: the element
+     *        at index 0 is the object, and the element at index 1 is
+     *        the name of the method to call in the object.
+     *
+     *        When $mode is PEAR_ERROR_PRINT or PEAR_ERROR_DIE, this is
+     *        a printf format string used when printing the error
+     *        message.
+     *
+     * @access public
+     * @return void
+     * @see PEAR_ERROR_RETURN
+     * @see PEAR_ERROR_PRINT
+     * @see PEAR_ERROR_TRIGGER
+     * @see PEAR_ERROR_DIE
+     * @see PEAR_ERROR_CALLBACK
+     * @see PEAR_ERROR_EXCEPTION
+     *
+     * @since PHP 4.0.5
+     */
+
+    function setErrorHandling($mode = null, $options = null)
+    {
+        if (isset($this) && is_a($this, 'PEAR')) {
+            $setmode     = &$this->_default_error_mode;
+            $setoptions  = &$this->_default_error_options;
+        } else {
+            $setmode     = &$GLOBALS['_PEAR_default_error_mode'];
+            $setoptions  = &$GLOBALS['_PEAR_default_error_options'];
+        }
+
+        switch ($mode) {
+            case PEAR_ERROR_EXCEPTION:
+            case PEAR_ERROR_RETURN:
+            case PEAR_ERROR_PRINT:
+            case PEAR_ERROR_TRIGGER:
+            case PEAR_ERROR_DIE:
+            case null:
+                $setmode = $mode;
+                $setoptions = $options;
+                break;
+
+            case PEAR_ERROR_CALLBACK:
+                $setmode = $mode;
+                // class/object method callback
+                if (is_callable($options)) {
+                    $setoptions = $options;
+                } else {
+                    trigger_error("invalid error callback", E_USER_WARNING);
+                }
+                break;
+
+            default:
+                trigger_error("invalid error mode", E_USER_WARNING);
+                break;
+        }
+    }
+
+    // }}}
+    // {{{ expectError()
+
+    /**
+     * This method is used to tell which errors you expect to get.
+     * Expected errors are always returned with error mode
+     * PEAR_ERROR_RETURN.  Expected error codes are stored in a stack,
+     * and this method pushes a new element onto it.  The list of
+     * expected errors are in effect until they are popped off the
+     * stack with the popExpect() method.
+     *
+     * Note that this method can not be called statically
+     *
+     * @param mixed $code a single error code or an array of error codes to expect
+     *
+     * @return int     the new depth of the "expected errors" stack
+     * @access public
+     */
+    function expectError($code = '*')
+    {
+        if (is_array($code)) {
+            array_push($this->_expected_errors, $code);
+        } else {
+            array_push($this->_expected_errors, array($code));
+        }
+        return sizeof($this->_expected_errors);
+    }
+
+    // }}}
+    // {{{ popExpect()
+
+    /**
+     * This method pops one element off the expected error codes
+     * stack.
+     *
+     * @return array   the list of error codes that were popped
+     */
+    function popExpect()
+    {
+        return array_pop($this->_expected_errors);
+    }
+
+    // }}}
+    // {{{ _checkDelExpect()
+
+    /**
+     * This method checks unsets an error code if available
+     *
+     * @param mixed error code
+     * @return bool true if the error code was unset, false otherwise
+     * @access private
+     * @since PHP 4.3.0
+     */
+    function _checkDelExpect($error_code)
+    {
+        $deleted = false;
+
+        foreach ($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)]);
+                $deleted = true;
+            }
+
+            // clean up empty arrays
+            if (0 == count($this->_expected_errors[$key])) {
+                unset($this->_expected_errors[$key]);
+            }
+        }
+        return $deleted;
+    }
+
+    // }}}
+    // {{{ delExpect()
+
+    /**
+     * This method deletes all occurences of the specified element from
+     * the expected error codes stack.
+     *
+     * @param  mixed $error_code error code that should be deleted
+     * @return mixed list of error codes that were deleted or error
+     * @access public
+     * @since PHP 4.3.0
+     */
+    function delExpect($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;
+                }
+            }
+            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
+        }
+    }
+
+    // }}}
+    // {{{ raiseError()
+
+    /**
+     * This method is a wrapper that returns an instance of the
+     * configured error class with this object's default error
+     * handling applied.  If the $mode and $options parameters are not
+     * specified, the object's defaults are used.
+     *
+     * @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 int $mode      One of PEAR_ERROR_RETURN, PEAR_ERROR_PRINT,
+     *                  PEAR_ERROR_TRIGGER, PEAR_ERROR_DIE,
+     *                  PEAR_ERROR_CALLBACK, PEAR_ERROR_EXCEPTION.
+     *
+     * @param mixed $options If $mode is PEAR_ERROR_TRIGGER, this parameter
+     *                  specifies the PHP-internal error level (one of
+     *                  E_USER_NOTICE, E_USER_WARNING or E_USER_ERROR).
+     *                  If $mode is PEAR_ERROR_CALLBACK, this
+     *                  parameter specifies the callback function or
+     *                  method.  In other error modes this parameter
+     *                  is ignored.
+     *
+     * @param string $userinfo If you need to pass along for example debug
+     *                  information, this parameter is meant for that.
+     *
+     * @param string $error_class The returned error object will be
+     *                  instantiated from this class, if specified.
+     *
+     * @param bool $skipmsg If true, raiseError will only pass error codes,
+     *                  the error message parameter will be dropped.
+     *
+     * @access public
+     * @return object   a PEAR error object
+     * @see PEAR::setErrorHandling
+     * @since PHP 4.0.5
+     */
+    function &raiseError($message = null,
+                         $code = null,
+                         $mode = null,
+                         $options = null,
+                         $userinfo = null,
+                         $error_class = null,
+                         $skipmsg = false)
+    {
+        // The error is yet a PEAR error object
+        if (is_object($message)) {
+            $code        = $message->getCode();
+            $userinfo    = $message->getUserInfo();
+            $error_class = $message->getType();
+            $message->error_message_prefix = '';
+            $message     = $message->getMessage();
+        }
+
+        if (isset($this) && isset($this->_expected_errors) && sizeof($this->_expected_errors) > 0 && sizeof($exp = end($this->_expected_errors))) {
+            if ($exp[0] == "*" ||
+                (is_int(reset($exp)) && in_array($code, $exp)) ||
+                (is_string(reset($exp)) && in_array($message, $exp))) {
+                $mode = PEAR_ERROR_RETURN;
+            }
+        }
+        // No mode given, try global ones
+        if ($mode === null) {
+            // Class error handler
+            if (isset($this) && isset($this->_default_error_mode)) {
+                $mode    = $this->_default_error_mode;
+                $options = $this->_default_error_options;
+            // Global error handler
+            } elseif (isset($GLOBALS['_PEAR_default_error_mode'])) {
+                $mode    = $GLOBALS['_PEAR_default_error_mode'];
+                $options = $GLOBALS['_PEAR_default_error_options'];
+            }
+        }
+
+        if ($error_class !== null) {
+            $ec = $error_class;
+        } elseif (isset($this) && isset($this->_error_class)) {
+            $ec = $this->_error_class;
+        } else {
+            $ec = 'PEAR_Error';
+        }
+        if ($skipmsg) {
+            $a = &new $ec($code, $mode, $options, $userinfo);
+            return $a;
+        } else {
+            $a = &new $ec($message, $code, $mode, $options, $userinfo);
+            return $a;
+        }
+    }
+
+    // }}}
+    // {{{ throwError()
+
+    /**
+     * Simpler form of raiseError with fewer options.  In most cases
+     * message, code and userinfo are enough.
+     *
+     * @param string $message
+     *
+     */
+    function &throwError($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 $a;
+        }
+    }
+
+    // }}}
+    function staticPushErrorHandling($mode, $options = null)
+    {
+        $stack = &$GLOBALS['_PEAR_error_handler_stack'];
+        $def_mode    = &$GLOBALS['_PEAR_default_error_mode'];
+        $def_options = &$GLOBALS['_PEAR_default_error_options'];
+        $stack[] = array($def_mode, $def_options);
+        switch ($mode) {
+            case PEAR_ERROR_EXCEPTION:
+            case PEAR_ERROR_RETURN:
+            case PEAR_ERROR_PRINT:
+            case PEAR_ERROR_TRIGGER:
+            case PEAR_ERROR_DIE:
+            case null:
+                $def_mode = $mode;
+                $def_options = $options;
+                break;
+
+            case PEAR_ERROR_CALLBACK:
+                $def_mode = $mode;
+                // class/object method callback
+                if (is_callable($options)) {
+                    $def_options = $options;
+                } else {
+                    trigger_error("invalid error callback", E_USER_WARNING);
+                }
+                break;
+
+            default:
+                trigger_error("invalid error mode", E_USER_WARNING);
+                break;
+        }
+        $stack[] = array($mode, $options);
+        return true;
+    }
+
+    function staticPopErrorHandling()
+    {
+        $stack = &$GLOBALS['_PEAR_error_handler_stack'];
+        $setmode     = &$GLOBALS['_PEAR_default_error_mode'];
+        $setoptions  = &$GLOBALS['_PEAR_default_error_options'];
+        array_pop($stack);
+        list($mode, $options) = $stack[sizeof($stack) - 1];
+        array_pop($stack);
+        switch ($mode) {
+            case PEAR_ERROR_EXCEPTION:
+            case PEAR_ERROR_RETURN:
+            case PEAR_ERROR_PRINT:
+            case PEAR_ERROR_TRIGGER:
+            case PEAR_ERROR_DIE:
+            case null:
+                $setmode = $mode;
+                $setoptions = $options;
+                break;
+
+            case PEAR_ERROR_CALLBACK:
+                $setmode = $mode;
+                // class/object method callback
+                if (is_callable($options)) {
+                    $setoptions = $options;
+                } else {
+                    trigger_error("invalid error callback", E_USER_WARNING);
+                }
+                break;
+
+            default:
+                trigger_error("invalid error mode", E_USER_WARNING);
+                break;
+        }
+        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
+     * it later with popErrorHandling.
+     *
+     * @param mixed $mode (same as setErrorHandling)
+     * @param mixed $options (same as setErrorHandling)
+     *
+     * @return bool Always true
+     *
+     * @see PEAR::setErrorHandling
+     */
+    function pushErrorHandling($mode, $options = null)
+    {
+        $stack = &$GLOBALS['_PEAR_error_handler_stack'];
+        if (isset($this) && is_a($this, 'PEAR')) {
+            $def_mode    = &$this->_default_error_mode;
+            $def_options = &$this->_default_error_options;
+        } else {
+            $def_mode    = &$GLOBALS['_PEAR_default_error_mode'];
+            $def_options = &$GLOBALS['_PEAR_default_error_options'];
+        }
+        $stack[] = array($def_mode, $def_options);
+
+        if (isset($this) && is_a($this, 'PEAR')) {
+            $this->setErrorHandling($mode, $options);
+        } else {
+            PEAR::setErrorHandling($mode, $options);
+        }
+        $stack[] = array($mode, $options);
+        return true;
+    }
+
+    // }}}
+    // {{{ popErrorHandling()
+
+    /**
+    * Pop the last error handler used
+    *
+    * @return bool Always true
+    *
+    * @see PEAR::pushErrorHandling
+    */
+    function popErrorHandling()
+    {
+        $stack = &$GLOBALS['_PEAR_error_handler_stack'];
+        array_pop($stack);
+        list($mode, $options) = $stack[sizeof($stack) - 1];
+        array_pop($stack);
+        if (isset($this) && is_a($this, 'PEAR')) {
+            $this->setErrorHandling($mode, $options);
+        } else {
+            PEAR::setErrorHandling($mode, $options);
+        }
+        return true;
+    }
+
+    // }}}
+    // {{{ loadExtension()
+
+    /**
+    * OS independant PHP extension load. Remember to take care
+    * on the correct extension name for case sensitive OSes.
+    *
+    * @param string $ext The extension name
+    * @return bool Success or not on the dl() call
+    */
+    function loadExtension($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);
+        }
+        return true;
+    }
+
+    // }}}
+}
+
+// {{{ _PEAR_call_destructors()
+
+function _PEAR_call_destructors()
+{
+    global $_PEAR_destructor_object_list;
+    if (is_array($_PEAR_destructor_object_list) &&
+        sizeof($_PEAR_destructor_object_list))
+    {
+        reset($_PEAR_destructor_object_list);
+        if (PEAR::getStaticProperty('PEAR', 'destructlifo')) {
+            $_PEAR_destructor_object_list = array_reverse($_PEAR_destructor_object_list);
+        }
+        while (list($k, $objref) = each($_PEAR_destructor_object_list)) {
+            $classname = get_class($objref);
+            while ($classname) {
+                $destructor = "_$classname";
+                if (method_exists($objref, $destructor)) {
+                    $objref->$destructor();
+                    break;
+                } else {
+                    $classname = get_parent_class($classname);
+                }
+            }
+        }
+        // Empty the object list to ensure that destructors are
+        // not called more than once.
+        $_PEAR_destructor_object_list = array();
+    }
+
+    // Now call the shutdown functions
+    if (is_array($GLOBALS['_PEAR_shutdown_funcs']) AND !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
+ *
+ * This class is supserseded by {@link PEAR_Exception} in PHP 5
+ *
+ * @category   pear
+ * @package    PEAR
+ * @author     Stig Bakken <ssb@php.net>
+ * @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: 1.5.0
+ * @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;
+    var $code                 = -1;
+    var $message              = '';
+    var $userinfo             = '';
+    var $backtrace            = null;
+
+    // }}}
+    // {{{ constructor
+
+    /**
+     * PEAR_Error constructor
+     *
+     * @param string $message  message
+     *
+     * @param int $code     (optional) error code
+     *
+     * @param int $mode     (optional) error mode, one of: PEAR_ERROR_RETURN,
+     * PEAR_ERROR_PRINT, PEAR_ERROR_DIE, PEAR_ERROR_TRIGGER,
+     * PEAR_ERROR_CALLBACK or PEAR_ERROR_EXCEPTION
+     *
+     * @param mixed $options   (optional) error level, _OR_ in the case of
+     * PEAR_ERROR_CALLBACK, the callback function or object/method
+     * tuple.
+     *
+     * @param string $userinfo (optional) additional user/debug info
+     *
+     * @access public
+     *
+     */
+    function PEAR_Error($message = 'unknown error', $code = null,
+                        $mode = null, $options = null, $userinfo = null)
+    {
+        if ($mode === null) {
+            $mode = PEAR_ERROR_RETURN;
+        }
+        $this->message   = $message;
+        $this->code      = $code;
+        $this->mode      = $mode;
+        $this->userinfo  = $userinfo;
+        if (!PEAR::getStaticProperty('PEAR_Error', '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 = $options;
+        } else {
+            if ($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)) {
+                $format = "%s";
+                if (substr($msg, -1) != "\n") {
+                    $msg .= "\n";
+                }
+            } else {
+                $format = $options;
+            }
+            die(sprintf($format, $msg));
+        }
+        if ($this->mode & PEAR_ERROR_CALLBACK) {
+            if (is_callable($this->callback)) {
+                call_user_func($this->callback, $this);
+            }
+        }
+        if ($this->mode & PEAR_ERROR_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() {
+        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() {
+        return $this->callback;
+    }
+
+    // }}}
+    // {{{ getMessage()
+
+
+    /**
+     * Get the error message from an error object.
+     *
+     * @return  string  full error message
+     * @access public
+     */
+    function getMessage()
+    {
+        return ($this->error_message_prefix . $this->message);
+    }
+
+
+    // }}}
+    // {{{ getCode()
+
+    /**
+     * Get error code from an error object
+     *
+     * @return int error code
+     * @access public
+     */
+     function getCode()
+     {
+        return $this->code;
+     }
+
+    // }}}
+    // {{{ getType()
+
+    /**
+     * Get the name of this error/exception.
+     *
+     * @return string error/exception name (type)
+     * @access public
+     */
+    function getType()
+    {
+        return get_class($this);
+    }
+
+    // }}}
+    // {{{ getUserInfo()
+
+    /**
+     * Get additional user-supplied information.
+     *
+     * @return string user-supplied information
+     * @access public
+     */
+    function getUserInfo()
+    {
+        return $this->userinfo;
+    }
+
+    // }}}
+    // {{{ getDebugInfo()
+
+    /**
+     * Get additional debug information supplied by the application.
+     *
+     * @return string debug information
+     * @access public
+     */
+    function getDebugInfo()
+    {
+        return $this->getUserInfo();
+    }
+
+    // }}}
+    // {{{ getBacktrace()
+
+    /**
+     * Get the call backtrace from where the error was generated.
+     * Supported with PHP 4.3.0 or newer.
+     *
+     * @param int $frame (optional) what frame to fetch
+     * @return array Backtrace, or NULL if not available.
+     * @access public
+     */
+    function getBacktrace($frame = null)
+    {
+        if (defined('PEAR_IGNORE_BACKTRACE')) {
+            return null;
+        }
+        if ($frame === null) {
+            return $this->backtrace;
+        }
+        return $this->backtrace[$frame];
+    }
+
+    // }}}
+    // {{{ addUserInfo()
+
+    function addUserInfo($info)
+    {
+        if (empty($this->userinfo)) {
+            $this->userinfo = $info;
+        } else {
+            $this->userinfo .= " ** $info";
+        }
+    }
+
+    // }}}
+    // {{{ toString()
+
+    /**
+     * Make a string representation of this object.
+     *
+     * @return string a string with an object summary
+     * @access public
+     */
+    function toString() {
+        $modes = array();
+        $levels = array(E_USER_NOTICE  => 'notice',
+                        E_USER_WARNING => 'warning',
+                        E_USER_ERROR   => 'error');
+        if ($this->mode & PEAR_ERROR_CALLBACK) {
+            if (is_array($this->callback)) {
+                $callback = (is_object($this->callback[0]) ?
+                    strtolower(get_class($this->callback[0])) :
+                    $this->callback[0]) . '::' .
+                    $this->callback[1];
+            } else {
+                $callback = $this->callback;
+            }
+            return sprintf('[%s: message="%s" code=%d mode=callback '.
+                           'callback=%s prefix="%s" info="%s"]',
+                           strtolower(get_class($this)), $this->message, $this->code,
+                           $callback, $this->error_message_prefix,
+                           $this->userinfo);
+        }
+        if ($this->mode & PEAR_ERROR_PRINT) {
+            $modes[] = 'print';
+        }
+        if ($this->mode & PEAR_ERROR_TRIGGER) {
+            $modes[] = 'trigger';
+        }
+        if ($this->mode & PEAR_ERROR_DIE) {
+            $modes[] = 'die';
+        }
+        if ($this->mode & PEAR_ERROR_RETURN) {
+            $modes[] = 'return';
+        }
+        return sprintf('[%s: message="%s" code=%d mode=%s level=%s '.
+                       'prefix="%s" info="%s"]',
+                       strtolower(get_class($this)), $this->message, $this->code,
+                       implode("|", $modes), $levels[$this->level],
+                       $this->error_message_prefix,
+                       $this->userinfo);
+    }
+
+    // }}}
+}
+
+/*
+ * Local Variables:
+ * mode: php
+ * tab-width: 4
+ * c-basic-offset: 4
+ * End:
+ */
+?>