3v4l.org

run code in 300+ PHP versions simultaneously
<?php $contentBefore = " an online shell that allows you to run your code on my server. I compiled more than 150 different PHP versions (every version released since 4.3.0) plus HHVM for you to use. For every "; echo substr($contentBefore, strpos($contentBefore, ' '), strrpos($contentBefore, ' '));

preferences:
48.61 ms | 402 KiB | 5 Q