3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump( mb_convert_encoding( "\xf4\x90\xbf\xbf", 'UTF-16BE', 'UTF-8' ) );
Output for 5.4.20 - 5.4.45, 5.5.2 - 7.1.0
string(8) "????"
Output for 5.4.0 - 5.4.19, 5.5.0 - 5.5.1
string(6) "???"
Output for 4.3.0 - 5.3.29
string(4) "��"