3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $word = "$1$s"; if(preg_match('/^\$[1-9]{1}\$s/' ,$word)){ echo 'true'; } else { echo 'false'; }
Output for 5.0.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: s in /in/P44FN on line 3 false
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: s in /in/P44FN on line 3 false