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<?php $a = ['123' => 'abc']; $b = ['123' => 'foobar']; var_dump(array_merge($a, $b)); var_dump($a+$b);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(3) "abc" [1]=> string(6) "foobar" } array(1) { [123]=> string(3) "abc" }

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