3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $key = md5("this"); $i = 0; $str = ""; while ($i < strlen($key)) { if (strpos($str, $key[$i]) === false) { $str .= $key[$i]; } $i++; } echo $str;
Output for 4.3.0 - 7.2.0
9e25341b0fdca