3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $text = 'СТРОКа'; echo mb_strtoupper($text) === $text ? 'yes' : 'no';
Output for 5.6.0 - 7.3.0
no
Output for 4.3.0 - 5.5.38
yes