How to convert the null values to empty string in php array?

Question

I want to convert this array that Array[4] should not give null it can give blank space (empty string).

Array (
    [0] => 1
    [1] => 4
    [2] =>         


        

Answer 1

This can be solved in one line using:

array_walk($array_json_return,function(&$item){$item=strval($item);});

here $array_json_return is the array.