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<?php $config = ["a" => "green", "b" => "red", "d" => "blue"]; $allow = ["a","b","c"]; $result = \array_filter($config, function ($item) use ($allow) { return \in_array($item, $allow, true); }, \ARRAY_FILTER_USE_KEY); print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [a] => green [b] => red )

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