3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = []; $a['R3']['C3'] = 66; $a['R1']['C1'] = 123; $a['R2']['C2'] = 423523; $a['R1']['C2'] = 3; print_r ($a);

preferences:
41.68 ms | 402 KiB | 5 Q