有没有办法无限深入到数组中

Question

i have the following code

foreach($arrayData as $_key_l1 => $_data_l1)
{
    if(is_array($_data_l1))
    {

    }
    else
    {
        switch($_data_l1)
        {
            case '':
                $arrayData[$_key_l1] = null;
                break;
        }
    }
}

the idea is that when $arrayData is passed into the loop, if any element in the array is itself an array it'll step deeper, using the code above, i would copy that into the if and replace the _l1 in the variables with _l# where # is the level i'm on, i would also add another [$_key_l#]

at the moment i don't expect it to be any deeper than 3 levels however i would like it if it could go though the array without me having to add in code for each level of depth, so i am wondering, is there already a way do to what i'm trying to do but more dynamicly

NOTE: the switch ... case is incomplete, so far it just turns blank strings into null

Answer 1

You can use recursive function calls.

Example:

function step_array(&$arr) {
    foreach ($arr as $key => $val) {
        if (is_array($val)) {
            step_array($val);
        } else {
            // deal with the value
        }
    }
}

Answer 2

you can use the built in function of php named array_walk_recursive()

here is the tutorial link

array_walk_recursive()