The Zend_Loader class contains a method you can register with the
PHP SPL autoloader. Zend_Loader::autoload()
is the callback method. As a convenience, Zend_Loader provides
the registerAutoload() function to register its
autoload() method. If the spl_autoload
extension is not present in your PHP environment, then the
registerAutoload() method throws a
Zend_Exception.
Example 518. Example of registering the autoloader callback method
<?php
Zend_Loader::registerAutoload();
After registering the Zend Framework autoload callback, you can
reference classes from Zend Framework without having to load
them explicitly. The autoload() method uses
Zend_Loader::loadClass() automatically when you
reference a class.
If you have extended the Zend_Loader class, you can give an
optional argument to registerAutoload(), to specify
the class from which to register an autoload() method.
Example 519. Example of registering the autoload callback method from an extended class
Because of the semantics of static function references in PHP,
you must implement code for both loadClass()
and autoload(), and the autoload()
must call self::loadClass(). If your
autoload() method delegates to its parent to
call self::loadClass(), then it calls the
method of that name in the parent class, not the subclass.
<?php
class My_Loader extends Zend_Loader
{
public static function loadClass($class, $dirs = null)
{
parent::loadClass($class, $dirs);
}
public static function autoload($class)
{
try {
self::loadClass($class);
return $class;
} catch (Exception $e) {
return false;
}
}
}
Zend_Loader::registerAutoload('My_Loader');
You can remove an autoload callback. The
registerAutoload() has an optional second argument,
which is TRUE by default. If this argument is
FALSE, the autoload callback is unregistered from the
SPL autoload stack.