mambax7 / extgallery

class/pear/PEAR.php

<?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
 * @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);
/**#@-*/

if ('WIN' == substr(PHP_OS, 0, 3)) {
    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'] = [];
$GLOBALS['_PEAR_shutdown_funcs']         = [];
$GLOBALS['_PEAR_error_handler_stack']    = [];

@ini_set('track_errors', true);

true of type true is incompatible with the type string expected by parameter $value of ini_set().

/**
 * 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: 1.10.12
 * @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
     */
    public $_debug = false;
    /**
     * Default error mode for this object.
     *
     * @var     int
     * @access  private
     */
    public $_default_error_mode = null;
    /**
     * Default error options used for this object when error mode
     * is PEAR_ERROR_TRIGGER.
     *
     * @var     int
     * @access  private
     */
    public $_default_error_options = null;
    /**
     * Default error handler (callback) for this object, if error mode is
     * PEAR_ERROR_CALLBACK.
     *
     * @var     string
     * @access  private
     */
    public $_default_error_handler = '';
    /**
     * Which class to use for error objects.
     *
     * @var     string
     * @access  private
     */
    public $_error_class = 'PEAR_Error';
    /**
     * An array of expected errors.
     *
     * @var     array
     * @access  private
     */
    public $_expected_errors = [];
    /**
     * List of methods that can be called both statically and non-statically.
     * @var array
     */
    protected static $bivalentMethods = [
        'setErrorHandling'  => true,
        'raiseError'        => true,
        'throwError'        => true,
        'pushErrorHandling' => true,
        'popErrorHandling'  => true,
    ];

    /**
     * Constructor.  Registers this object in
     * $_PEAR_destructor_object_list for destructor emulation if a
     * destructor object exists.
     *
     * @param string $error_class (optional) which class to use for
     *                            error objects, defaults to PEAR_Error.
     * @access public
     * @return void
     */
    public function __construct($error_class = null)
    {
        $classname = strtolower(get_class($this));
        if ($this->_debug) {
            print "PEAR constructor called, class=$classname\n";
        }

        if (null !== $error_class) {
            $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)
    {
        self::__construct($error_class);

The method PEAR::__construct() is not static, but was called statically.

    }

    /**
     * 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
     */
    public function _PEAR()
    {
        if ($this->_debug) {
            printf("PEAR destructor called, class=%s\n", strtolower(get_class($this)));
        }
    }

    public function __call($method, $arguments)
    {
        if (!isset(self::$bivalentMethods[$method])) {
            trigger_error(
                'Call to undefined method PEAR::' . $method . '()',
                E_USER_ERROR
            );
        }
        return call_user_func_array(
            [get_class(), '_' . $method],
            array_merge([$this], $arguments)
        );
    }

    public static function __callStatic($method, $arguments)
    {
        if (!isset(self::$bivalentMethods[$method])) {
            trigger_error(
                'Call to undefined method PEAR::' . $method . '()',
                E_USER_ERROR
            );
        }
        return call_user_func_array(
            [get_class(), '_' . $method],
            array_merge([null], $arguments)
        );
    }

    /**
     * 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!
     *
     * @param string $class The calling classname, to prevent clashes
     * @param string $var   The variable to retrieve.
     * @return mixed   A reference to the variable. If not set it will be
     *                      auto initialised to NULL.
     */
    public static function &getStaticProperty($class, $var)
    {
        static $properties;
        if (!isset($properties[$class])) {
            $properties[$class] = [];
        }

        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.
     *
     * @param mixed $func The function name (or array of class/method) to call
     * @param mixed $args The arguments to pass to the function
     *
     * @return void
     */
    public static function registerShutdownFunc($func, $args = [])
    {
        // if we are called statically, there is a potential
        // that no shutdown func is registered.  Bug #6445
        if (!isset($GLOBALS['_PEAR_SHUTDOWN_REGISTERED'])) {
            register_shutdown_function('_PEAR_call_destructors');
            $GLOBALS['_PEAR_SHUTDOWN_REGISTERED'] = true;
        }
        $GLOBALS['_PEAR_shutdown_funcs'][] = [$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() == $code
     *
     * @return  bool    true if parameter is an error
     */
    public static function isError($data, $code = null)
    {
        if (!is_a($data, 'PEAR_Error')) {
            return false;
        }

        if (null === $code) {
            return true;
        } elseif (is_string($code)) {

The condition is_string($code) is always false.

            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 object $object
     *        Object the method was called on (non-static mode)
     *
     * @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
     */
    protected static function _setErrorHandling(
        $object,
        $mode = null,
        $options = null
    ) {
        if (null !== $object) {
            $setmode    = &$object->_default_error_mode;
            $setoptions = &$object->_default_error_options;
        } else {
            $setmode    = &$GLOBALS['_PEAR_default_error_mode'];
            $setoptions = &$GLOBALS['_PEAR_default_error_options'];
        }

        switch ($mode) {
            case PEAR_ERROR_EXCEPTION:

The constant PEAR_ERROR_EXCEPTION has been deprecated.

            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 $code a single error code or an array of error codes to expect
     *
     * @return int     the new depth of the "expected errors" stack
     * @access public
     */
    public function expectError($code = '*')
    {
        if (is_array($code)) {
            array_push($this->_expected_errors, $code);
        } else {
            array_push($this->_expected_errors, [$code]);
        }
        return count($this->_expected_errors);
    }

    /**
     * This method pops one element off the expected error codes
     * stack.
     *
     * @return array   the list of error codes that were popped
     */
    public 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
     */
    public 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 occurrences of the specified element from
     * the expected error codes stack.
     *
     * @param mixed $error_code error code that should be deleted
     * @return mixed list of error codes that were deleted or error
     * @access public
     * @since  PHP 4.3.0
     */
    public function delExpect($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 : self::raiseError('The expected error you submitted does not exist'); // IMPROVE ME

The method raiseError() does not exist on PEAR. Since you implemented __callStatic, consider adding a @method annotation.

        } elseif (!empty($error_code)) {
            // $error_code comes alone, trying to unset it
            if ($this->_checkDelExpect($error_code)) {
                return true;
            }

            return self::raiseError('The expected error you submitted does not exist'); // IMPROVE ME
        }

        // $error_code is empty
        return self::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.
     *
     * @return object   a PEAR error object
     * @see   PEAR::setErrorHandling
     * @since PHP 4.0.5
     */
    protected static function _raiseError(
        $object,
        $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 (null !== $object
            && isset($object->_expected_errors)
            && count($object->_expected_errors) > 0
            && count($exp = end($object->_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 (null === $mode) {
            // Class error handler
            if (null !== $object && isset($object->_default_error_mode)) {
                $mode    = $object->_default_error_mode;
                $options = $object->_default_error_options;
                // Global error handler
            } elseif (isset($GLOBALS['_PEAR_default_error_mode'])) {
                $mode    = $GLOBALS['_PEAR_default_error_mode'];
                $options = $GLOBALS['_PEAR_default_error_options'];
            }
        }

        if (null !== $error_class) {
            $ec = $error_class;
        } elseif (null !== $object && isset($object->_error_class)) {
            $ec = $object->_error_class;
        } else {
            $ec = 'PEAR_Error';
        }

        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 $userinfo If you need to pass along for example debug
     *                         information, this parameter is meant for that.
     *
     * @return object   a PEAR error object
     * @see PEAR::raiseError
     */
    protected static function _throwError($object, $message = null, $code = null, $userinfo = null)
    {
        if (null !== $object) {
            $a = $object->raiseError($message, $code, null, null, $userinfo);
            return $a;
        }

        $a = self::raiseError($message, $code, null, null, $userinfo);
        return $a;
    }

    public static 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'];
        $stack[]     = [$def_mode, $def_options];
        switch ($mode) {
            case PEAR_ERROR_EXCEPTION:

The constant PEAR_ERROR_EXCEPTION has been deprecated.

            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;
        }
        $stack[] = [$mode, $options];
        return true;
    }

    public static function staticPopErrorHandling()
    {
        $stack      = &$GLOBALS['_PEAR_error_handler_stack'];
        $setmode    = &$GLOBALS['_PEAR_default_error_mode'];
        $setoptions = &$GLOBALS['_PEAR_default_error_options'];
        array_pop($stack);
        [$mode, $options] = $stack[count($stack) - 1];
        array_pop($stack);
        switch ($mode) {
            case PEAR_ERROR_EXCEPTION:

The constant PEAR_ERROR_EXCEPTION has been deprecated.

            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 $options (same as setErrorHandling)
     *
     * @return bool Always true
     *
     * @see PEAR::setErrorHandling
     */
    protected static function _pushErrorHandling($object, $mode, $options = null)
    {
        $stack = &$GLOBALS['_PEAR_error_handler_stack'];
        if (null !== $object) {
            $def_mode    = &$object->_default_error_mode;
            $def_options = &$object->_default_error_options;
        } else {
            $def_mode    = &$GLOBALS['_PEAR_default_error_mode'];
            $def_options = &$GLOBALS['_PEAR_default_error_options'];
        }
        $stack[] = [$def_mode, $def_options];

        if (null !== $object) {
            $object->setErrorHandling($mode, $options);
        } else {
            self::setErrorHandling($mode, $options);

The method setErrorHandling() does not exist on PEAR. Since you implemented __callStatic, consider adding a @method annotation.

        }
        $stack[] = [$mode, $options];
        return true;
    }

    /**
     * Pop the last error handler used
     *
     * @return bool Always true
     *
     * @see PEAR::pushErrorHandling
     */
    protected static function _popErrorHandling($object)
    {
        $stack = &$GLOBALS['_PEAR_error_handler_stack'];
        array_pop($stack);
        [$mode, $options] = $stack[count($stack) - 1];
        array_pop($stack);
        if (null !== $object) {
            $object->setErrorHandling($mode, $options);
        } else {
            self::setErrorHandling($mode, $options);
        }
        return true;
    }

    /**
     * OS independent PHP extension load. Remember to take care
     * on the correct extension name for case sensitive OSes.
     *
     * @param string $ext The extension name
     * @return bool Success or not on the dl() call
     */
    public static function loadExtension($ext)
    {
        if (extension_loaded($ext)) {
            return true;
        }

        // if either returns true dl() will produce a FATAL error, stop that
        if (false === function_exists('dl')
            || 1 != ini_get('enable_dl')) {
            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);
    }

    /**
     * Get SOURCE_DATE_EPOCH environment variable
     * See https://reproducible-builds.org/specs/source-date-epoch/
     *
     * @return int
     * @access public
     */
    public static function getSourceDateEpoch()
    {
        if ($source_date_epoch = getenv('SOURCE_DATE_EPOCH')) {
            if (preg_match('/^\d+$/', $source_date_epoch)) {
                return (int)$source_date_epoch;
            } else {
                //  "If the value is malformed, the build process SHOULD exit with a non-zero error code."
                self::raiseError("Invalid SOURCE_DATE_EPOCH: $source_date_epoch");
                exit(1);

Using exit here is not recommended.

            }
        } else {
            return time();
        }
    }
}

function _PEAR_call_destructors()
{
    global $_PEAR_destructor_object_list;
    if (is_array($_PEAR_destructor_object_list)
        && count($_PEAR_destructor_object_list)) {
        reset($_PEAR_destructor_object_list);

        $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 = [];
    }

    // 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: 1.10.12
 * @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
{
    public $error_message_prefix = '';
    public $mode                 = PEAR_ERROR_RETURN;
    public $level                = E_USER_NOTICE;
    public $code                 = -1;
    public $message              = '';
    public $userinfo             = '';
    public $backtrace            = null;

    /**
     * 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
     *
     */
    public function __construct(
        $message = 'unknown error',
        $code = null,
        $mode = null,
        $options = null,
        $userinfo = null
    ) {
        if (null === $mode) {
            $mode = PEAR_ERROR_RETURN;
        }
        $this->message  = $message;
        $this->code     = $code;
        $this->mode     = $mode;
        $this->userinfo = $userinfo;

        $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;

The property callback does not exist. Although not strictly required by PHP, it is generally a best practice to declare properties explicitly.

        } else {
            if (null === $options) {
                $options = E_USER_NOTICE;
            }

            $this->level    = $options;
            $this->callback = null;
        }

        if ($this->mode & PEAR_ERROR_PRINT) {
            if (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 (null === $options || is_int($options)) {
                $format = '%s';
                if ("\n" != substr($msg, -1)) {
                    $msg .= "\n";
                }
            } else {
                $format = $options;
            }
            printf($format, $msg);
            exit($code);

Using exit here is not recommended.

        }

        if ($this->mode & PEAR_ERROR_CALLBACK && is_callable($this->callback)) {
            call_user_func($this->callback, $this);

It seems like $this->callback can also be of type null; however, parameter $callback of call_user_func() does only seem to accept callable, maybe add an additional type check?

        }

        if ($this->mode & PEAR_ERROR_EXCEPTION) {

The constant PEAR_ERROR_EXCEPTION has been deprecated.

            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);');

The use of eval() is discouraged.

        }
    }

    /**
     * Only here for backwards compatibility.
     *
     * Class "Cache_Error" still uses it, among others.
     *
     * @param string $message  Message
     * @param int    $code     Error code
     * @param int    $mode     Error mode
     * @param mixed  $options  See __construct()
     * @param string $userinfo Additional user/debug info
     */
    public function PEAR_Error(
        $message = 'unknown error',
        $code = null,
        $mode = null,
        $options = null,
        $userinfo = null
    ) {
        self::__construct($message, $code, $mode, $options, $userinfo);

The method PEAR_Error::__construct() is not static, but was called statically.

    }

    /**
     * Get the error mode from an error object.
     *
     * @return int error mode
     * @access public
     */
    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
     */
    public function getCallback()
    {
        return $this->callback;
    }

    /**
     * Get the error message from an error object.
     *
     * @return  string  full error message
     * @access public
     */
    public function getMessage()
    {
        return ($this->error_message_prefix . $this->message);
    }

    /**
     * Get error code from an error object
     *
     * @return int error code
     * @access public
     */
    public function getCode()
    {
        return $this->code;
    }

    /**
     * Get the name of this error/exception.
     *
     * @return string error/exception name (type)
     * @access public
     */
    public function getType()
    {
        return get_class($this);
    }

    /**
     * Get additional user-supplied information.
     *
     * @return string user-supplied information
     * @access public
     */
    public function getUserInfo()
    {
        return $this->userinfo;
    }

    /**
     * Get additional debug information supplied by the application.
     *
     * @return string debug information
     * @access public
     */
    public function getDebugInfo()
    {
        return $this->getUserInfo();
    }

    /**
     * Get the call backtrace from where the error was generated.
     * Supported with PHP 4.3.0 or newer.
     *
     * @param int $frame (optional) what frame to fetch
     * @return array Backtrace, or NULL if not available.
     * @access public
     */
    public function getBacktrace($frame = null)
    {
        if (defined('PEAR_IGNORE_BACKTRACE')) {
            return null;
        }
        if (null === $frame) {
            return $this->backtrace;
        }
        return $this->backtrace[$frame];
    }

    public function addUserInfo($info)
    {
        if (empty($this->userinfo)) {
            $this->userinfo = $info;
        } else {
            $this->userinfo .= " ** $info";
        }
    }

    public function __toString()
    {
        return $this->getMessage();
    }

    /**
     * Make a string representation of this object.
     *
     * @return string a string with an object summary
     * @access public
     */
    public function toString()
    {
        $modes  = [];
        $levels = [
            E_USER_NOTICE  => 'notice',
            E_USER_WARNING => 'warning',
            E_USER_ERROR   => 'error',
        ];
        if ($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:
 */