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<?php $details = ["Dog" => "Natahlia", "Cat" => "Ryan", "Bird" => "Natahlia"]; foreach(array_unique($details) as $name){ $new[$name] = array_keys(array_intersect($details, [$name])); } var_dump($new);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["Natahlia"]=> array(2) { [0]=> string(3) "Dog" [1]=> string(4) "Bird" } ["Ryan"]=> array(1) { [0]=> string(3) "Cat" } }

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