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<?php $arr = [ 0 => "556878", 1 => "12345", 2 => "12345", 3 => "234567", 4 => "45673", 5 => "45673", ]; $n = 2; $result = array_keys(array_intersect(array_count_values($arr), [$n])); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> int(12345) [1]=> int(45673) }

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