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

PHP 5.3+

$array = array_map(function($v){
    return (is_null($v)) ? "" : $v;
},$array);