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run code in 300+ PHP versions simultaneously
<?php $a1 = [ 'val1' => 12, 'val2' => 13, 'val3' => 14, ]; $a2 = [ 'val1' => 4, 'val2' => 5, 'val4' => 6, ]; print_r($a1, $a2);

preferences:
68.48 ms | 402 KiB | 5 Q