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<?php $arr = array('a' => 123, 'b' => 213, 'c' => 321); $allowed = array('b', 'c'); print_r(array_intersect_key($arr, array_flip($allowed)));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [b] => 213 [c] => 321 )

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