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<?php $data1 = array("Peter" => "1", "Ann" => "1", "Susan" => "2", "Tom"=> "3"); $find = 1; Var_dump(array_keys(array_intersect($data1, [$find])));
Output for rfc.property-hooks, git.master, git.master_jit
array(2) { [0]=> string(5) "Peter" [1]=> string(3) "Ann" }

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