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<?php class Zend_Registry extends ArrayObject { /** * Class name of the singleton registry object. * @var string */ private static $_registryClassName = 'Zend_Registry'; /** * Registry object provides storage for shared objects. * @var Zend_Registry */ private static $_registry = null; /** * Retrieves the default registry instance. * * @return Zend_Registry */ public static function getInstance() { if (self::$_registry === null) { self::init(); } return self::$_registry; } /** * Set the default registry instance to a specified instance. * * @param Zend_Registry $registry An object instance of type Zend_Registry, * or a subclass. * @return void * @throws Zend_Exception if registry is already initialized. */ public static function setInstance(Zend_Registry $registry) { if (self::$_registry !== null) { require_once 'Zend/Exception.php'; throw new Zend_Exception('Registry is already initialized'); } self::setClassName(get_class($registry)); self::$_registry = $registry; } /** * Initialize the default registry instance. * * @return void */ protected static function init() { self::setInstance(new self::$_registryClassName()); } /** * Set the class name to use for the default registry instance. * Does not affect the currently initialized instance, it only applies * for the next time you instantiate. * * @param string $registryClassName * @return void * @throws Zend_Exception if the registry is initialized or if the * class name is not valid. */ public static function setClassName($registryClassName = 'Zend_Registry') { if (self::$_registry !== null) { require_once 'Zend/Exception.php'; throw new Zend_Exception('Registry is already initialized'); } if (!is_string($registryClassName)) { require_once 'Zend/Exception.php'; throw new Zend_Exception("Argument is not a class name"); } /** * @see Zend_Loader */ if (!class_exists($registryClassName)) { require_once 'Zend/Loader.php'; Zend_Loader::loadClass($registryClassName); } self::$_registryClassName = $registryClassName; } /** * Unset the default registry instance. * Primarily used in tearDown() in unit tests. * @returns void */ public static function _unsetInstance() { self::$_registry = null; } /** * getter method, basically same as offsetGet(). * * This method can be called from an object of type Zend_Registry, or it * can be called statically. In the latter case, it uses the default * static instance stored in the class. * * @param string $index - get the value associated with $index * @return mixed * @throws Zend_Exception if no entry is registerd for $index. */ public static function get($index) { $instance = self::getInstance(); if (!$instance->offsetExists($index)) { require_once 'Zend/Exception.php'; throw new Zend_Exception("No entry is registered for key '$index'"); } return $instance->offsetGet($index); } /** * setter method, basically same as offsetSet(). * * This method can be called from an object of type Zend_Registry, or it * can be called statically. In the latter case, it uses the default * static instance stored in the class. * * @param string $index The location in the ArrayObject in which to store * the value. * @param mixed $value The object to store in the ArrayObject. * @return void */ public static function set($index, $value) { $instance = self::getInstance(); $instance->offsetSet($index, $value); } /** * Returns TRUE if the $index is a named value in the registry, * or FALSE if $index was not found in the registry. * * @param string $index * @return boolean */ public static function isRegistered($index) { if (self::$_registry === null) { return false; } return self::$_registry->offsetExists($index); } /** * Constructs a parent ArrayObject with default * ARRAY_AS_PROPS to allow acces as an object * * @param array $array data array * @param integer $flags ArrayObject flags */ public function __construct($array = array(), $flags = parent::ARRAY_AS_PROPS) { parent::__construct($array, $flags); } /** * @param string $index * @returns mixed * * Workaround for http://bugs.php.net/bug.php?id=40442 (ZF-960). */ public function offsetExists($index) { return array_key_exists($index, $this); } } $registry = Zend_Registry::getInstance(); $registry['null'] = null; var_dump(isset($registry['null'])); var_dump(Zend_Registry::isRegistered('null'));