3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $var = ' Hello World'; //x4 spaces echo preg_replace("/ {2}/m/","\t",$var);
Output for 4.3.11 - 7.2.0
Warning: preg_replace(): Unknown modifier '/' in /in/0IXR8 on line 3
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '/' in /in/0IXR8 on line 3