Proyectos de Subversion Moodle

<?php

/**

 * PEAR, the PHP Extension and Application Repository

 *

 * PEAR class and PEAR_Error class

 *

 * PHP versions 4 and 5

 *

 * @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  1997-2010 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

 */

/**#@+

 * 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

}

$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://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

 * @link        http://pear.php.net/manual/en/core.pear.php#core.pear.pear

 */

class PEAR

{

    /**

     * 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.  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 __construct($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);

            }

        }

    }

    /**

     * Only here for backwards compatibility.

     * E.g. Archive_Tar calls $this->PEAR() in its constructor.

     *

     * @param string $error_class Which class to use for error objects,

     *                            defaults to PEAR_Error.

     */

    public function PEAR($error_class = null)

    {

        $this->__construct($error_class);

    }

    /**

     * 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)));

        }

    }

    /**

    * 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];

    }

    /**

    * 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);

    }

    /**

     * 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')) {

            return false;

        }

        if (is_null($code)) {

            return true;

        } elseif (is_string($code)) {

            return $data->getMessage() == $code;

        }

        return $data->getCode() == $code;

    }

    /**

     * 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;

        }

    }

    /**

     * 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 count($this->_expected_errors);

    }

    /**

     * 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);

    }

    /**

     * 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;

    }

    /**

     * 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) {

                $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;

            }

            return PEAR::raiseError("The expected error you submitted does not exist"); // IMPROVE ME

        }

        // $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

     * 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) &&

            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))

            ) {

                $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 (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);

        } else {

            $a = new $ec($message, $code, $mode, $options, $userinfo);

        }

        return $a;

    }

    /**

     * Simpler form of raiseError with fewer options.  In most cases

     * message, code and userinfo are enough.

     *

     * @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)

    {

        if (isset($this) && is_a($this, 'PEAR')) {

            $a = &$this->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'];

        $def_mode    = &$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;

    }

    /**

     * 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;

    }

    /**

    * 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;

    }

    /**

    * 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)) {

            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;

        }

        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 (PEAR_ZE2) {

    include_once 'PEAR5.php';

}

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_ZE2) {

            $destructLifoExists = PEAR5::getStaticProperty('PEAR', 'destructlifo');

        } else {

            $destructLifoExists = PEAR::getStaticProperty('PEAR', 'destructlifo');

        }

        if ($destructLifoExists) {

            $_PEAR_destructor_object_list = array_reverse($_PEAR_destructor_object_list);

        }

        foreach ($_PEAR_destructor_object_list as $k => $objref) {

            $classname = get_class($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 (

        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

 *

 * 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://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

{

    var $error_message_prefix = '';

    var $mode                 = PEAR_ERROR_RETURN;

    var $level                = E_USER_NOTICE;

    var $code                 = -1;

    var $message              = '';

    var $userinfo             = '';

    var $backtrace            = null;

    /** @var mixed error level. */

    private $callback;

    /**

     * 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 __construct($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_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;

        } 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 ($this->mode & PEAR_ERROR_CALLBACK && is_callable($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);');

        }

    }

    /**

     * Old syntax of class constructor for backward compatibility.

     */

    public function PEAR_Error($message = 'unknown error', $code = null,

                        $mode = null, $options = null, $userinfo = null) {

        self::__construct($message, $code, $mode, $options, $userinfo);

    }

    /**

     * Get the error mode from an error object.

     *

     * @return int error mode

     * @access public

     */

    function getMode()

    {

        return $this->mode;

    }

    /**

     * Get the callback function/method from an error object.

     *

     * @return mixed callback function or object/method array

     * @access public

     */

    function getCallback()

    {

        return $this->callback;

    }

    /**

     * Get the error message from an error object.

     *

     * @return  string  full error message

     * @access public

     */

    function getMessage()

    {

        return ($this->error_message_prefix . $this->message);

    }

    /**

     * Get error code from an error object

     *

     * @return int error code

     * @access public

     */

     function getCode()

     {

        return $this->code;

     }

    /**

     * Get the name of this error/exception.

     *

     * @return string error/exception name (type)

     * @access public

     */

    function getType()

    {

        return get_class($this);

    }

    /**

     * Get additional user-supplied information.

     *

     * @return string user-supplied information

     * @access public

     */

    function getUserInfo()

    {

        return $this->userinfo;

    }

    /**

     * Get additional debug information supplied by the application.

     *

     * @return string debug information

     * @access public

     */

    function getDebugInfo()

    {

        return $this->getUserInfo();

    }