3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(array(2=>"a"),array(5=>"b")); echo print_r($a); array_push($a, array(4=>"c")); array_push($a, array(2=>"c")); echo print_r($a);

preferences:
51.22 ms | 402 KiB | 5 Q