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authordavehauenstein <davehauenstein@d4e419ec-0920-11de-bbfd-a7c1bc4c261e>2009-04-15 22:06:42 +0000
committerdavehauenstein <davehauenstein@d4e419ec-0920-11de-bbfd-a7c1bc4c261e>2009-04-15 22:06:42 +0000
commitc53d8d026021f97075fb2f4940ba22793c38fb6e (patch)
treec5d7865bc0fd226ecc7525d7de8a1d0b0c5c89fd /lib/Zend/Loader.php
parenta414fcee8e7dc733443c6a971162d0dd9d0e723f (diff)
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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 12507 2008-11-10 16:29:09Z matthew $
+ */
+
+/**
+ * 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 '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 $file;
+ }
+
+ if (!class_exists($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 (!$fh = @fopen($filename, 'r', true)) {
+ return false;
+ }
+ @fclose($fh);
+ 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', $enabled = true)
+ {
+ if (!function_exists('spl_autoload_register')) {
+ require_once 'Zend/Exception.php';
+ throw new Zend_Exception('spl_autoload does not exist in this PHP installation');
+ }
+
+ self::loadClass($class);
+ $methods = get_class_methods($class);
+ if (!in_array('autoload', (array) $methods)) {
+ require_once 'Zend/Exception.php';
+ throw new Zend_Exception("The class \"$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 '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 ;
+ }
+ }
+}