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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) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/**
* Static methods for loading classes and files.
*
* @category Zend
* @package Zend_Loader
* @copyright Copyright (c) 2005-2010 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 'Zend/Exception.php';
throw new Zend_Exception('Directory argument must be a string or an array');
}
// Autodiscover the path from the class name
// Implementation is PHP namespace-aware, and based on
// Framework Interop Group reference implementation:
// http://groups.google.com/group/php-standards/web/psr-0-final-proposal
$className = ltrim($class, '\\');
$file = '';
$namespace = '';
if ($lastNsPos = strripos($className, '\\')) {
$namespace = substr($className, 0, $lastNsPos);
$className = substr($className, $lastNsPos + 1);
$file = str_replace('\\', DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
}
$file .= str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';
if (!empty($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, $dirs, true);
} else {
self::loadFile($file, null, true);
}
if (!class_exists($class, false) && !interface_exists($class, false)) {
require_once '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.
*
* Note from ZF-2900:
* If you use custom error handler, please check whether return value
* from error_reporting() is zero or not.
* At mark of fopen() can not suppress warning if the handler is used.
*
* @param string $filename
* @return boolean
*/
public static function isReadable($filename)
{
if (is_readable($filename)) {
// Return early if the filename is readable without needing the
// include_path
return true;
}
if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN'
&& preg_match('/^[a-z]:/i', $filename)
) {
// If on windows, and path provided is clearly an absolute path,
// return false immediately
return false;
}
foreach (self::explodeIncludePath() as $path) {
if ($path == '.') {
if (is_readable($filename)) {
return true;
}
continue;
}
$file = $path . '/' . $filename;
if (is_readable($file)) {
return true;
}
}
return false;
}
/**
* Explode an include path into an array
*
* If no path provided, uses current include_path. Works around issues that
* occur when the path includes stream schemas.
*
* @param string|null $path
* @return array
*/
public static function explodeIncludePath($path = null)
{
if (null === $path) {
$path = get_include_path();
}
if (PATH_SEPARATOR == ':') {
// On *nix systems, include_paths which include paths with a stream
// schema cannot be safely explode'd, so we have to be a bit more
// intelligent in the approach.
$paths = preg_split('#:(?!//)#', $path);
} else {
$paths = explode(PATH_SEPARATOR, $path);
}
return $paths;
}
/**
* spl_autoload() suitable implementation for supporting class autoloading.
*
* Attach to spl_autoload() using the following:
* <code>
* spl_autoload_register(array('Zend_Loader', 'autoload'));
* </code>
*
* @deprecated Since 1.8.0
* @param string $class
* @return string|false Class name on success; false on failure
*/
public static function autoload($class)
{
trigger_error(__CLASS__ . '::' . __METHOD__ . ' is deprecated as of 1.8.0 and will be removed with 2.0.0; use Zend_Loader_Autoloader instead', E_USER_NOTICE);
try {
@self::loadClass($class);
return $class;
} catch (Exception $e) {
return false;
}
}
/**
* Register {@link autoload()} with spl_autoload()
*
* @deprecated Since 1.8.0
* @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)
{
trigger_error(__CLASS__ . '::' . __METHOD__ . ' is deprecated as of 1.8.0 and will be removed with 2.0.0; use Zend_Loader_Autoloader instead', E_USER_NOTICE);
require_once 'Zend/Loader/Autoloader.php';
$autoloader = Zend_Loader_Autoloader::getInstance();
$autoloader->setFallbackAutoloader(true);
if ('Zend_Loader' != $class) {
self::loadClass($class);
$methods = get_class_methods($class);
if (!in_array('autoload', (array) $methods)) {
require_once 'Zend/Exception.php';
throw new Zend_Exception("The class \"$class\" does not have an autoload() method");
}
$callback = array($class, 'autoload');
if ($enabled) {
$autoloader->pushAutoloader($callback);
} else {
$autoloader->removeAutoloader($callback);
}
}
}
/**
* 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 '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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