1--TEST-- 2ZE2 An interface must be implemented 3--FILE-- 4<?php 5 6interface if_a { 7 function f_a(); 8} 9 10class derived_a implements if_a { 11} 12 13?> 14--EXPECTF-- 15Fatal error: Class derived_a contains 1 abstract method and must therefore be declared abstract or implement the remaining method (if_a::f_a) in %s on line %d 16