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<?php $arr1 = ['test' => 'test', 'yup' => 'nope']; $arr2 = ['test', 'yup', 'yolo']; $diff = array_diff(array_keys($arr1), $arr2); var_dump($diff);
Output for git.master, git.master_jit, rfc.property-hooks
array(0) { }

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