Best way to Convert array of arrays into single array

I want to convert

$array_of_arrays = [[1,2,3],[4,5,6],[7,8],[9,10]];

Into

 $array = [1,2,3,4,5,6,7,8,9,10];

I can use

    $array = [];
 foreach($array_of_arrays as $one_array):
    $array = array_merge($array,$one_array);
   endforeach;          

But i have very long array of arrays, is there any function(method) exists for doing this without foreach loop