PHP foreach change two-dimensional original array values

I need to replace null value to 0 and change original arrays to output. My code are not work… Only change the second foreach loop value. how to do it? I need the output array is… (My null value is not fixed in key) thank you very much… my array:

 Array
    (
        [0] => Array
            (
                [D1] => 2
                [D2] => 2
                [D3] =>   (Expect the null value to change to 0)
                [D4] =>   (Expect the null value to change to 0)
                [D6] =>   (Expect the null value to change to 0)
                [N1] => 1
                [N2] => 1
                [N3] =>   (Expect the null value to change to 0)
                [N4] =>   (Expect the null value to change to 0)
                [N5] =>   (Expect the null value to change to 0)
            )
    
        [1] => Array
            (
                [D1] => 3
                [D2] => 2
                [D3] => 2
                [D4] => 2
                [D5] =>   (Expect the null value to change to 0)
                [D6] =>   (Expect the null value to change to 0)
                [T1] => 1
                [T2] => 1
                [T3] => -1
                [T4] =>   (Expect the null value to change to 0)
                [T5] =>   (Expect the null value to change to 0)
            )
    
    )

Below is my code:

 foreach($myArray as $key=> $value){
        foreach($value as $key2 => $value2){
            if(empty($value[$key2])){
             $value[$key2]="0";
           }
             //print_R($value[$key2]);
}   
    

Answer

You can use & which passes variable reference in the foreach loop. You can try the below codes.

foreach ($myArray as $key => &$value) {
    foreach ($value as $key2 => $value2) {
        if($value2 == null) {
         $value[$key2]="0";
        }
    }
}
print_r($myArray);