foreach loops with dynamic number of loops

Question

Currently, I am looping through 4 foreach loops:

foreach ($level0_array as $level0_key => $level1_array) {
    //do something
    foreach ($level1_array as $level1_key => $level2_array) {
        //do something
        foreach ($level2_array as $level2_key => $level3_array) {
            //do something
            foreach ($level3_array as $level3_key => $level4_value) {
                //do something
            }
        }
    }
}

Is it possible to do it if this loop is inside a function and it is supposed to get the number of levels to loop through dynamically? (Assuming in this case that $level0_array have enough levels in it)

i.e.

function ($level0_array, $number_of_levels) {
    // loop. . .
}

@Blackhole The thing I was afraid of :}, ever since they made us program Hanoi Towers with recursion back in university — pileup, Dec 29 '22 at 12:43
[Is there a way to loop through a multidimensional array without knowing it's depth?](https://stackoverflow.com/questions/10928993/is-there-a-way-to-loop-through-a-multidimensional-array-without-knowing-its-dep) — Alive to die - Anant, Dec 29 '22 at 12:43
@Anant-Alivetodie, thanks, looks similar to my question, will take a look, if it is then mine could be a duplicate — pileup, Dec 29 '22 at 12:44

KIKO Software · Answer 1 · 2022-12-29T13:48:52.917

Yes, there is, and it is called recursion:

function loopThroughLevels($level_array, $number_of_levels_left) {
     foreach ($level_array as $level_key => $level_value) {
         // do something
         if (is_array($level_value) &&
             ($number_of_levels_left > 0)) {
             loopThroughLevels($level_value, $number_of_levels_left - 1);
         }
     }
}

Here the function calls itself again, looping through a sub-level of the array as long as there is an array to loop through and there are levels left you want to loop through.

foreach loops with dynamic number of loops

1 Answers1