1--TEST-- 2SplDoublyLinkedList::top() - pass in an unexpected null parameter 3--CREDITS-- 4PHPNW Testfest 2009 - Adrian Hardy 5--FILE-- 6<?php 7 8$list = new SplDoublyLinkedList(); 9$list->push("top"); 10$list->top(null); 11 12?> 13--EXPECTF-- 14Warning: SplDoublyLinkedList::top() expects exactly 0 parameters, 1 given in %s on line %d 15