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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Loader
* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Loader.php 8906 2008-03-19 19:15:30Z darby $
*/
/**
* Static methods for loading classes and files.
*
* @category Zend
* @package Zend_Loader
* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Loader {
/**
* Loads a class from a PHP file. The filename must be formatted
* as "$class.php".
*
* If $dirs is a string or an array, it will search the directories
* in the order supplied, and attempt to load the first matching file.
*
* If $dirs is null, it will split the class name at underscores to
* generate a path hierarchy (e.g., "Zend_Example_Class" will map
* to "Zend/Example/Class.php").
*
* If the file was not found in the $dirs, or if no $dirs were specified,
* it will attempt to load it from PHP's include_path.
*
* @param string $class - The full class name of a Zend component.
* @param string|array $dirs - OPTIONAL Either a path or an array of paths
* to search.
* @return void
* @throws Zend_Exception
*/
public static function loadClass($class, $dirs = null) {
if (class_exists($class, false) || interface_exists($class, false)) {
return;
}
if ((null !== $dirs) && ! is_string($dirs) && ! is_array($dirs)) {
require_once 'external/Zend/Exception.php';
throw new Zend_Exception('Directory argument must be a string or an array');
}
// autodiscover the path from the class name
$file = str_replace('_', DIRECTORY_SEPARATOR, $class) . '.php';
if (! empty($dirs)) {
// use the autodiscovered path
$dirPath = dirname($file);
if (is_string($dirs)) {
$dirs = explode(PATH_SEPARATOR, $dirs);
}
foreach ($dirs as $key => $dir) {
if ($dir == '.') {
$dirs[$key] = $dirPath;
} else {
$dir = rtrim($dir, '\\/');
$dirs[$key] = $dir . DIRECTORY_SEPARATOR . $dirPath;
}
}
$file = basename($file);
self::loadFile($file, $dirs, true);
} else {
self::_securityCheck($file);
include_once 'external/' . $file;
}
if (! class_exists($class, false) && ! interface_exists($class, false)) {
require_once 'external/Zend/Exception.php';
throw new Zend_Exception("File \"$file\" does not exist or class \"$class\" was not found in the file");
}
}
/**
* Loads a PHP file. This is a wrapper for PHP's include() function.
*
* $filename must be the complete filename, including any
* extension such as ".php". Note that a security check is performed that
* does not permit extended characters in the filename. This method is
* intended for loading Zend Framework files.
*
* If $dirs is a string or an array, it will search the directories
* in the order supplied, and attempt to load the first matching file.
*
* If the file was not found in the $dirs, or if no $dirs were specified,
* it will attempt to load it from PHP's include_path.
*
* If $once is TRUE, it will use include_once() instead of include().
*
* @param string $filename
* @param string|array $dirs - OPTIONAL either a path or array of paths
* to search.
* @param boolean $once
* @return boolean
* @throws Zend_Exception
*/
public static function loadFile($filename, $dirs = null, $once = false) {
self::_securityCheck($filename);
/**
* Search in provided directories, as well as include_path
*/
$incPath = false;
if (! empty($dirs) && (is_array($dirs) || is_string($dirs))) {
if (is_array($dirs)) {
$dirs = implode(PATH_SEPARATOR, $dirs);
}
$incPath = get_include_path();
set_include_path($dirs . PATH_SEPARATOR . $incPath);
}
/**
* Try finding for the plain filename in the include_path.
*/
if ($once) {
include_once $filename;
} else {
include $filename;
}
/**
* If searching in directories, reset include_path
*/
if ($incPath) {
set_include_path($incPath);
}
return true;
}
/**
* Returns TRUE if the $filename is readable, or FALSE otherwise.
* This function uses the PHP include_path, where PHP's is_readable()
* does not.
*
* @param string $filename
* @return boolean
*/
public static function isReadable($filename) {
if (! $fh = @fopen($filename, 'r', true)) {
return false;
}
return true;
}
/**
* spl_autoload() suitable implementation for supporting class autoloading.
*
* Attach to spl_autoload() using the following:
* <code>
* spl_autoload_register(array('Zend_Loader', 'autoload'));
* </code>
*
* @param string $class
* @return string|false Class name on success; false on failure
*/
public static function autoload($class) {
try {
self::loadClass($class);
return $class;
} catch (Exception $e) {
return false;
}
}
/**
* Register {@link autoload()} with spl_autoload()
*
* @param string $class (optional)
* @param boolean $enabled (optional)
* @return void
* @throws Zend_Exception if spl_autoload() is not found
* or if the specified class does not have an autoload() method.
*/
public static function registerAutoload($class = 'Zend_Loader', $enabled = true) {
if (! function_exists('spl_autoload_register')) {
require_once 'external/Zend/Exception.php';
throw new Zend_Exception('spl_autoload does not exist in this PHP installation');
}
self::loadClass($class);
$methods = get_class_methods($class);
if (! in_array('autoload', (array)$methods)) {
require_once 'external/Zend/Exception.php';
throw new Zend_Exception("The class \"$class\" does not have an autoload() method");
}
if ($enabled === true) {
spl_autoload_register(array($class, 'autoload'));
} else {
spl_autoload_unregister(array($class, 'autoload'));
}
}
/**
* Ensure that filename does not contain exploits
*
* @param string $filename
* @return void
* @throws Zend_Exception
*/
protected static function _securityCheck($filename) {
/**
* Security check
*/
if (preg_match('/[^a-z0-9\\/\\\\_.-]/i', $filename)) {
require_once 'external/Zend/Exception.php';
throw new Zend_Exception('Security check: Illegal character in filename');
}
}
/**
* Attempt to include() the file.
*
* include() is not prefixed with the @ operator because if
* the file is loaded and contains a parse error, execution
* will halt silently and this is difficult to debug.
*
* Always set display_errors = Off on production servers!
*
* @param string $filespec
* @param boolean $once
* @return boolean
* @deprecated Since 1.5.0; use loadFile() instead
*/
protected static function _includeFile($filespec, $once = false) {
if ($once) {
return include_once $filespec;
} else {
return include $filespec;
}
}
}
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