public function getValue($key) {
		if (isset ( $this->a [$key] )) {
			return $this->a [$key];
		} else {
			return NULL;
		}
	}
public function getValue($key) {
		if (isset ( $this->a [$key] )) {
			return $this->a [$key];
		} else {
			return NULL;
		}
	}
public function getValue ( $ key ) { if ( isset ( $ this -> a [ $ key ] ) ) { return $ this -> a [ $ key ] ; } else { return NULL ; } }
Getter method for a specific value referenced by the given key.

@param string $key
Getter method for a specific value referenced by the given key .