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<?php $oldArray = [["2"],["2","3","4"],["8","9"],["7","4"]]; $newArray = array_unique(call_user_func_array('array_merge', $oldArray)); sort($newArray); var_dump($newArray);
Output for git.master, git.master_jit, rfc.property-hooks
array(6) { [0]=> string(1) "2" [1]=> string(1) "3" [2]=> string(1) "4" [3]=> string(1) "7" [4]=> string(1) "8" [5]=> string(1) "9" }

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