3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = "FFFFF"; $a[2] = "Q"; $a[9] = "W"; echo preg_replace("/\s/", "-", $a);
based on 8T8hW
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
FFQFF----W