3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_match('/./u', "\xf8\xa1\xa1\xa1\xa1"));
Output for 5.3.4 - 7.1.0
bool(false)
Output for 4.4.9, 5.2.5 - 5.3.3
int(0)
Output for 4.3.0 - 4.4.8, 5.0.0 - 5.2.4
int(1)