3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr=[]; function addToArray($arr,$val) { array_push($arr,["order_id"=>$val]); } addToArray($arr,"1234"); addToArray($arr,"1234"); print_r($arr); ?>
based on Kh8q7
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
Array ( )