3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo mb_substr('ru', -2, 2, 'UTF-8'); echo mb_strtolower('РФ');
Output for 5.6.8 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
ruрф
Output for 4.3.0 - 5.5.35
ru��