3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump( preg_replace( '//u', '', "\xf4\x8f\xbf\xbf" ) );
Output for 4.3.0 - 5.1.6, 5.2.9 - 5.3.23, 5.4.0 - 5.4.13, 5.4.41 - 5.4.45, 5.5.10 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
string(4) "􏿿"
Output for 5.2.0 - 5.2.8, 5.3.24 - 5.3.29, 5.4.14 - 5.4.40, 5.5.0 - 5.5.9
NULL