multidimensional array difference php

Question

I have two multidimensional arrays and I want the difference. For eg. I have taken two-dimensional two arrays below

$array1 = Array (
       [a1] => Array         


        

Answer 1

So if you have arrays with empty values or with empty arrays.

private function check_diff_multi($array1, $array2){
    $result = array();
    foreach($array1 as $key => $val) {
        if(array_key_exists($key,$array2)){
            if(is_array($val) && is_array($array2[$key]) && !empty($val)){
                $result[$key] = $this->check_diff_multi($val, $array2[$key]);
            }
        } else {
            $result[$key] = $val;
        }
    }
    return $result;
}