<?php $a = [ 'a' => 'A', 'b' => 'B', 3 => 'THREE', 4 => 'FOUR' ]; $b = [ 'b' => 'another-B', 'c' => 'C', 4 => 'another-FOUR' ]; var_dump(array_merge($a, $b)); var_dump(array_replace($a, $b));
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