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<?php $unflattened_array = [ '["2", "3"]', '["4"]', '["4", "3"]' ]; $flattened_array = []; foreach ($unflattened_array as $items) { array_push($flattened_array, ...json_decode($items)); } $flattened_array = array_unique($flattened_array); var_dump($flattened_array);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(1) "2" [1]=> string(1) "3" [2]=> string(1) "4" }

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