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<?php $a1 = ['foo' => 'bar', 'bar' => 'baz']; $a2 = ['baz' => 'foo']; $a3 = []; var_dump(array_merge($a1, $a2)); var_dump(array_merge($a1, $a3));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["foo"]=> string(3) "bar" ["bar"]=> string(3) "baz" ["baz"]=> string(3) "foo" } array(2) { ["foo"]=> string(3) "bar" ["bar"]=> string(3) "baz" }

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