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

I know this thread is kind of old, however I ran into a few problems with the original solution. So here is my solution of the problem.

private function array_diff_recursive($array1, $array2){
    $result = [];
    foreach($array1 as $key => $val) {
        if(array_key_exists($key, $array2)){
            if(is_array($val) || is_array($array2[$key])) {
                if (false === is_array($val) || false === is_array($array2[$key])) {
                    $result[$key] = $val;
                } else {
                    $result[$key] = $this->array_diff_recursive($val, $array2[$key]);
                    if (sizeof($result[$key]) === 0) {
                        unset($result[$key]);
                    }
                }
            }
        } else {
            $result[$key] = $val;
        }
    }
    return $result;
}

Problems Encountered / Fixed

1. Result populates with keys that have no difference
2. If one value is an array and the other is not, it doesn't consider it a difference