3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(substr('foo', 0, ''));
Output for 7.0.0 - 7.2.6
Warning: substr() expects parameter 3 to be integer, string given in /in/Zju9q on line 3 NULL
Output for 5.3.0 - 5.6.28
Warning: substr() expects parameter 3 to be long, string given in /in/Zju9q on line 3 NULL
Output for 4.3.0 - 5.2.17
string(0) ""