3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $name = "ΓΌ"; $name = preg_replace('/[^A-Za-z0-9]/ui', '_', $name ); var_dump($name);
based on cOhcB
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(1) "_"