3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = "ab"; echo preg_replace("/(a)|(b)/", ["+$2+", "-$1-"], $a);
based on LZQ6r
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.2.6
Warning: preg_replace(): Parameter mismatch, pattern is a string while replacement is an array in /in/dYqfv on line 5
Output for hhvm-3.15.4
Warning: Parameter mismatch, pattern is a string while replacement is an array in /in/dYqfv on line 5