PHP Iterate over unknown dimensional array

Question

I'm trying to guess how to iterate over multi-dimensional arrays with unknown number of dimensions. I've always done that job statically setting foreach statements inside foreach statements but I don't know how many statements to set this time because dimensions number is variable. In summary, All I need is to iterate over every element in a parent array that has more arrays as values and those values that are arrays have more arrays as values, and so on...

Answer 1

Recursion is all that you need:

function recur($arr) {
    if (!is_array($arr)) {
        // $arr is the last element
        echo "$arr ";
        return;
    }

    foreach($arr as $ar) recur($ar);
}