259 lines
8.3 KiB
PHP
259 lines
8.3 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Loader
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Loader.php 10454 2008-07-26 06:25:51Z ralph $
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*/
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/**
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* Static methods for loading classes and files.
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*
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* @category Zend
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* @package Zend_Loader
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Loader
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{
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/**
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* Loads a class from a PHP file. The filename must be formatted
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* as "$class.php".
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*
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* If $dirs is a string or an array, it will search the directories
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* in the order supplied, and attempt to load the first matching file.
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*
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* If $dirs is null, it will split the class name at underscores to
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* generate a path hierarchy (e.g., "Zend_Example_Class" will map
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* to "Zend/Example/Class.php").
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*
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* If the file was not found in the $dirs, or if no $dirs were specified,
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* it will attempt to load it from PHP's include_path.
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*
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* @param string $class - The full class name of a Zend component.
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* @param string|array $dirs - OPTIONAL Either a path or an array of paths
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* to search.
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* @return void
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* @throws Zend_Exception
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*/
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public static function loadClass($class, $dirs = null)
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{
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if (class_exists($class, false) || interface_exists($class, false)) {
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return;
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}
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if ((null !== $dirs) && !is_string($dirs) && !is_array($dirs)) {
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require_once 'Zend/Exception.php';
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throw new Zend_Exception('Directory argument must be a string or an array');
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}
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// autodiscover the path from the class name
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$file = str_replace('_', DIRECTORY_SEPARATOR, $class) . '.php';
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if (!empty($dirs)) {
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// use the autodiscovered path
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$dirPath = dirname($file);
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if (is_string($dirs)) {
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$dirs = explode(PATH_SEPARATOR, $dirs);
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}
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foreach ($dirs as $key => $dir) {
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if ($dir == '.') {
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$dirs[$key] = $dirPath;
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} else {
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$dir = rtrim($dir, '\\/');
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$dirs[$key] = $dir . DIRECTORY_SEPARATOR . $dirPath;
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}
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}
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$file = basename($file);
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self::loadFile($file, $dirs, true);
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} else {
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self::_securityCheck($file);
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include_once $file;
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}
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if (!class_exists($class, false) && !interface_exists($class, false)) {
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require_once 'Zend/Exception.php';
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throw new Zend_Exception("File \"$file\" does not exist or class \"$class\" was not found in the file");
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}
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}
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/**
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* Loads a PHP file. This is a wrapper for PHP's include() function.
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*
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* $filename must be the complete filename, including any
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* extension such as ".php". Note that a security check is performed that
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* does not permit extended characters in the filename. This method is
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* intended for loading Zend Framework files.
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*
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* If $dirs is a string or an array, it will search the directories
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* in the order supplied, and attempt to load the first matching file.
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*
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* If the file was not found in the $dirs, or if no $dirs were specified,
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* it will attempt to load it from PHP's include_path.
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*
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* If $once is TRUE, it will use include_once() instead of include().
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*
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* @param string $filename
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* @param string|array $dirs - OPTIONAL either a path or array of paths
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* to search.
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* @param boolean $once
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* @return boolean
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* @throws Zend_Exception
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*/
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public static function loadFile($filename, $dirs = null, $once = false)
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{
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self::_securityCheck($filename);
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/**
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* Search in provided directories, as well as include_path
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*/
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$incPath = false;
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if (!empty($dirs) && (is_array($dirs) || is_string($dirs))) {
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if (is_array($dirs)) {
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$dirs = implode(PATH_SEPARATOR, $dirs);
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}
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$incPath = get_include_path();
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set_include_path($dirs . PATH_SEPARATOR . $incPath);
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}
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/**
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* Try finding for the plain filename in the include_path.
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*/
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if ($once) {
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include_once $filename;
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} else {
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include $filename;
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}
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/**
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* If searching in directories, reset include_path
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*/
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if ($incPath) {
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set_include_path($incPath);
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}
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return true;
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}
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/**
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* Returns TRUE if the $filename is readable, or FALSE otherwise.
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* This function uses the PHP include_path, where PHP's is_readable()
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* does not.
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*
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* @param string $filename
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* @return boolean
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*/
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public static function isReadable($filename)
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{
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if (!$fh = @fopen($filename, 'r', true)) {
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return false;
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}
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@fclose($fh);
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return true;
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}
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/**
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* spl_autoload() suitable implementation for supporting class autoloading.
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*
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* Attach to spl_autoload() using the following:
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* <code>
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* spl_autoload_register(array('Zend_Loader', 'autoload'));
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* </code>
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*
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* @param string $class
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* @return string|false Class name on success; false on failure
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*/
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public static function autoload($class)
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{
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try {
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self::loadClass($class);
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return $class;
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} catch (Exception $e) {
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return false;
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}
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}
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/**
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* Register {@link autoload()} with spl_autoload()
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*
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* @param string $class (optional)
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* @param boolean $enabled (optional)
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* @return void
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* @throws Zend_Exception if spl_autoload() is not found
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* or if the specified class does not have an autoload() method.
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*/
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public static function registerAutoload($class = 'Zend_Loader', $enabled = true)
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{
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if (!function_exists('spl_autoload_register')) {
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require_once 'Zend/Exception.php';
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throw new Zend_Exception('spl_autoload does not exist in this PHP installation');
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}
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self::loadClass($class);
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$methods = get_class_methods($class);
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if (!in_array('autoload', (array) $methods)) {
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require_once 'Zend/Exception.php';
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throw new Zend_Exception("The class \"$class\" does not have an autoload() method");
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}
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if ($enabled === true) {
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spl_autoload_register(array($class, 'autoload'));
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} else {
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spl_autoload_unregister(array($class, 'autoload'));
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}
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}
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/**
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* Ensure that filename does not contain exploits
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*
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* @param string $filename
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* @return void
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* @throws Zend_Exception
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*/
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protected static function _securityCheck($filename)
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{
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/**
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* Security check
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*/
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if (preg_match('/[^a-z0-9\\/\\\\_.-]/i', $filename)) {
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require_once 'Zend/Exception.php';
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throw new Zend_Exception('Security check: Illegal character in filename');
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}
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}
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/**
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* Attempt to include() the file.
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*
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* include() is not prefixed with the @ operator because if
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* the file is loaded and contains a parse error, execution
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* will halt silently and this is difficult to debug.
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*
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* Always set display_errors = Off on production servers!
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*
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* @param string $filespec
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* @param boolean $once
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* @return boolean
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* @deprecated Since 1.5.0; use loadFile() instead
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*/
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protected static function _includeFile($filespec, $once = false)
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{
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if ($once) {
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return include_once $filespec;
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} else {
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return include $filespec ;
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}
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}
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}
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