21      * @param string $name String name
24     public function register($name, &$ref)  argument
26         if (array_key_exists($name, $this->_storage)) {
28                 "Name $name produces collision, cannot re-register",
33         $this->_storage[$name] =& $ref;
38      * @param string $name String name
42     public function &get($name, $ignore_error = false)  argument
44         if (!array_key_exists($name, $this->_storage)) {
47                     "Attempted to retrieve non-existent variable $name",
54         return $this->_storage[$name];
59      * @param string $name String name
61     public function destroy($name)  argument
63         if (!array_key_exists($name, $this->_storage)) {
65                 "Attempted to destroy non-existent variable $name",
70         unset($this->_storage[$name]);
75      * @param string $name String name
78     public function exists($name)  argument
80         return array_key_exists($name, $this->_storage);