1--TEST-- 2Implementating abstracting methods and optional parameters 3--FILE-- 4<?php 5 6abstract class Base 7{ 8 abstract function someMethod($param); 9} 10 11class Ext extends Base 12{ 13 function someMethod($param = "default") 14 { 15 echo $param, "\n"; 16 } 17} 18 19$a = new Ext(); 20$a->someMethod("foo"); 21$a->someMethod(); 22--EXPECT-- 23foo 24default 25