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

$out = array_diff_assoc_recursive($array1, $array2);

The solution requires recursing values of array which may themselves be arrays.

function array_diff_assoc_recursive($array1, $array2)
{
    foreach($array1 as $key => $value)
    {
        if(is_array($value))
        {
            if(!isset($array2[$key]))
            {
                $difference[$key] = $value;
            }
            elseif(!is_array($array2[$key]))
            {
                $difference[$key] = $value;
            }
            else
            {
                $new_diff = array_diff_assoc_recursive($value, $array2[$key]);
                if($new_diff != FALSE)
                {
                    $difference[$key] = $new_diff;
                }
            }
        }
        elseif(!isset($array2[$key]) || $array2[$key] != $value)
        {
            $difference[$key] = $value;
        }
    }
    return !isset($difference) ? 0 : $difference;
}