Question

Here is the multi dimensional array

$arr = array(
    array(141,151,161), 
    2, 
    3, 
    array(
        101, 
        202, 
        array(303,404)
    )
);

How to find the highest value, which the result in the array above should be 404.
The array depth can may be more than 3.

---

Here is the code i last tried, but i notice this only can check until 3 depth, i need it can be check unlimited depth

function MaxArray($arr){
    foreach($arr as $valueDepth1){
        if(is_array($valueDepth1)){
            foreach($valueDepth1 as $valueDepth2){
                if(is_array($valueDepth2)){
                    foreach($valueDepth2 as $valueDepth3){
                        $checingArray[]=$valueDepth3;
                    }
                }else{
                    $checingArray[]=$valueDepth2;
                }               
            }
        }else{
            $checingArray[]=$valueDepth1;
        }
    }

    return max($checingArray);
}

Answer 1

function highest($array) {
   foreach($array as $key => $value) {
       if (is_array($value)) {
           $array[$key] = highest($value);
       }
   }

   sort($array);

   return array_pop($array);
}

You can see it in action here: http://codepad.org/4xPFsU1U