3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array1 = ['foo' => [1, 2], 'bar' => 1]; $array2 = ['foo' => [3, 4], 'bar' => 2]; var_dump(array_replace_recursive($array1, $array2));

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67.74 ms | 402 KiB | 5 Q