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<?php $a = [100 => 'foo']; $b = [100 => 'bar']; var_dump(array_merge($a, $b)); var_dump($a + $b);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" } array(1) { [100]=> string(3) "foo" }

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