3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $serverName = "heart.se"; $mainDomainStartPos = strrpos(substr($serverName, 0, -1 + strrpos($serverName, ".")), '.'); echo substr($serverName, $mainDomainStartPos, 100);
based on O42pD
Output for 4.3.0 - 7.1.0
heart.se