3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php for ($i = 0; $i < 100000; $i++) { if (function_exists('mb_substr')) { } }
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0