3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(); $a[ array(1,2) ] = array(10,20); $a[ array(3,4) ] = array(30,40); $a[ array(1) ] = array(10); $a[ array(1,2) ][] = 15; print_r($a);

preferences:
63.7 ms | 402 KiB | 5 Q