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<?php $required = ['foo' => '', 'bar' => '']; $optional = ['baz' => '']; $data = ['foo' => '', 'baz' => '', 'sadsads' => '']; var_dump(array_diff_key($required + $optional, $data));
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { ["bar"]=> string(0) "" }

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