3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump( bin2hex( htmlspecialchars( "\xf4\x90\xbf\xbf", ENT_COMPAT, 'UTF-8' ) ) );
Output for 5.3.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(0) ""
Output for 4.3.2 - 5.3.3
string(8) "f490bfbf"
Output for 4.3.0 - 4.3.1

Process exited with code 139.