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<?php $keys = ['foo', 'bar']; $arr = ['foo' => 'fuu', 'baz' => 'BAZ']; $diff = array_diff($keys, array_keys($arr)); var_dump($diff);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [1]=> string(3) "bar" }

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