public function getSessionData( $key ) {
		self::ensureSession();
		if ( !isset( $_SESSION[ $key ] ) ) {
			return null;
		}
		return $_SESSION[$key];
	}
public function getSessionData( $key ) {
		self::ensureSession();
		if ( !isset( $_SESSION[ $key ] ) ) {
			return null;
		}
		return $_SESSION[$key];
	}
public function getSessionData ( $ key ) { self :: ensureSession ( ) ; if ( ! isset ( $ _SESSION [ $ key ] ) ) { return null ; } return $ _SESSION [ $ key ] ; }
Get data from session

@param string $key
@return mixed
Get data from session