3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x1 = $x2 = array(); $y = array('foo' => 'bar'); $x1 += $y; $x2 = array_merge($x2, $y); var_dump($x1); var_dump($x2);

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35.55 ms | 402 KiB | 5 Q