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| 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 'Exception.php';
throw new Zend_Exception('Directory argument must be a string or an array');
}
if (null === $dirs) {
$dirs = array();
}
if (is_string($dirs)) {
$dirs = (array) $dirs;
}
// autodiscover the path from the class name
$path = str_replace('_', DIRECTORY_SEPARATOR, $class);
if ($path != $class) {
// use the autodiscovered path
$dirPath = dirname($path);
if (0 == count($dirs)) {
$dirs = array($dirPath);
} else {
foreach ($dirs as $key => $dir) {
if ($dir == '.') {
$dirs[$key] = $dirPath;
} else {
$dir = rtrim($dir, '\\/');
$dirs[$key] = $dir . DIRECTORY_SEPARATOR . $dirPath;
}
}
}
$file = basename($path) . '.php';
} else {
$file = $class . '.php';
}
self::loadFile($file, $dirs, true);
if (!class_exists($class, false) && !interface_exists($class, false)) {
require_once 'Exception.php';
throw new Zend_Exception("File \"$file\" was loaded but 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)
{
/**
* Security check
*/
if (preg_match('/[^a-z0-9\-_.]/i', $filename)) {
require_once 'Exception.php';
throw new Zend_Exception('Security check: Illegal character in filename');
}
/**
* Search for the file in each of the dirs named in $dirs.
*/
if (is_null($dirs)) {
$dirs = array();
} elseif (is_string($dirs)) {
$dirs = explode(PATH_SEPARATOR, $dirs);
}
foreach ($dirs as $dir) {
$filespec = rtrim($dir, '\\/') . DIRECTORY_SEPARATOR . $filename;
if (self::isReadable($filespec)) {
return self::_includeFile($filespec, $once);
}
}
/**
* The file was not found in the $dirs specified.
* Try finding for the plain filename in the include_path.
*/
if (self::isReadable($filename)) {
return self::_includeFile($filename, $once);
}
/**
* The file was not located anywhere.
*/
require_once 'Exception.php';
throw new Zend_Exception("File \"$filename\" was not found");
}
/**
* 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 $once
* @return boolean
*/
protected static function _includeFile($filespec, $once = false)
{
if ($once) {
return include_once $filespec;
} else {
return include $filespec ;
}
}
/**
* 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 (@is_readable($filename)) {
return true;
}
$path = get_include_path();
$dirs = explode(PATH_SEPARATOR, $path);
foreach ($dirs as $dir) {
// No need to check against current dir -- already checked
if ('.' == $dir) {
continue;
}
if (@is_readable($dir . DIRECTORY_SEPARATOR . $filename)) {
return true;
}
}
return false;
}
/**
* 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 OPTIONAL $class
* @param boolean OPTIONAL $enabled
* @return void
* @throws Zend_Exception if spl_autoload() is not found
* or if the specified class does not have an autoload() method.
*/
public static function registerAutoload($class = 'Zend_Loader', $enabled = true)
{
if (!function_exists('spl_autoload_register')) {
require_once 'Exception.php';
throw new Zend_Exception('spl_autoload does not exist in this PHP installation');
}
self::loadClass($class);
$methods = get_class_methods($class);
if (!in_array('autoload', (array) $methods)) {
require_once 'Exception.php';
throw new Zend_Exception("The class \"$class\" does not have an autoload() method");
}
if ($enabled === true) {
spl_autoload_register(array($class, 'autoload'));
} else {
spl_autoload_unregister(array($class, 'autoload'));
}
}
} |
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