Test to see what online PHP testers do to escape this listing the files of the current directory.

gistfile1.php

function stev_al($str) {
	$test = "eval";
	$test($str);
}

echo stev_al(base64_decode("JGZpbGVzID0gZGlyKCcuLycpOw0Kd2hpbGUgKGZhbHNlICE9PSAoJGVudHJ5ID0gJGQtPnJlYWQoKSkpIHsNCiAgIGVjaG8gJGVudHJ5LiAiPGJyPiI7DQp9DQokZC0"));