Multidimensional associative array intersection php

Question

I have two multidimensional arrays

$array1 = Array (
   [a1] => Array  (
           [a_name] => aaaaa
           [a_value] => aaa
         )

   [b         


        

Answer 1

function recursive_array_intersect_key(array $array1, array $array2) {
    $array1 = array_intersect_key($array1, $array2);
    foreach ($array1 as $key => &$value) {
        if (is_array($value) && is_array($array2[$key])) {
            $value = recursive_array_intersect_key($value, $array2[$key]);
        }
    }
    return $array1;
}

Demo here.