3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php for ($i=0;$i<1;$i++) $a['a'.$i] = array('a','b','c','d','e','f'); for ($i=0; $i<10000; $i++) { $merged = call_user_func_array('array_merge', $a); }
based on MjjmM
Output for 4.3.0 - 7.3.1