3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php if(preg_match('/.*(\d+).*/','lol rofl',$matches) && count($matches) > 1) { echo 'yay'; } if (count($foo)) { echo "foo\n"; }
Output for 5.0.4 - 7.1.7
Notice: Undefined variable: foo in /in/v3LDZ on line 5
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: foo in /in/v3LDZ on line 5