<?php $a = [0, 1, 2]; $b = [3, 4]; var_dump($a + $b); var_dump($b + $a); $a = ["a" => 0, "b" => 1, "c" => 2]; $b = ["b" => 3, "d" => 4]; var_dump($a + $b); var_dump($b + $a);
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