3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $blogs = $a = array(1); for ($mppb_times = 4; $mppb_times>0; $mppb_times--) $blogs = array_merge($a, $blogs); print_r($a);
based on rGIbd
Output for 4.3.0 - 7.2.0
Array ( [0] => 1 )