1--TEST-- 2Testing function call through of array item 3--FILE-- 4<?php 5 6$arr = array('strtoupper', 'strtolower'); 7 8$k = 0; 9 10var_dump($arr[0]('foo') == 'FOO'); 11var_dump($arr[$k]('foo') == 'FOO'); 12var_dump($arr[++$k]('FOO') == 'foo'); 13var_dump($arr[++$k]('FOO') == 'foo'); 14 15?> 16--EXPECTF-- 17bool(true) 18bool(true) 19bool(true) 20 21Warning: Undefined array key 2 in %s on line %d 22 23Fatal error: Uncaught Error: Value of type null is not callable in %s:%d 24Stack trace: 25#0 {main} 26 thrown in %s on line %d 27
