3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump( preg_replace( '/foo/u', 'bar', "\xED\xA0\x81\xED\xB0\x80" ) );
Output for 5.2.14 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
NULL