3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(substr('t', 1));
Output for hhvm-3.15.4 - 3.17.3, 7.0.0 - 7.1.10
string(0) ""
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2
bool(false)
Output for hhvm-3.12.14

Process exited with code 137.