3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(mb_internal_encoding()); var_dump(mb_strtolower('你好?'));
Output for 5.6.7 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(5) "UTF-8" string(7) "你好?"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.3 - 5.5.35
string(10) "ISO-8859-1" string(7) "你好?"
Output for 4.3.0 - 4.3.2
string(4) "pass" string(7) "你好?"