3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(substr('', 0, 5));
Output for hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.2.1
string(0) ""
Output for 5.5.0 - 5.6.30, hhvm-3.10.1 - 3.13.2
bool(false)