3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php for($i = 0; $i < 256; ++$i){ for($k = 0; $k < 256; ++$k){ $z = sprintf("%%%08x%%08x", $i, $k); echo $z."\n"; $x = mb_strtolower(urldecode($z)); if($x=="'"){ echo $z."\n"; } } }
based on 4bnve