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<?php $arr = ['one' => 1, 'two' => 2, 'three' => 3]; $keys =['one', 'two', 'three']; $merged = array_diff(array_count_values(array_merge($keys, array_keys($arr))), [2]); var_dump($merged);
Output for git.master, git.master_jit, rfc.property-hooks
array(0) { }

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