php语法如何输出2个多维数组的不同

$arr1 = array(
  'name' => '小米',
  'age' => 22,
  'address' => array(
    'city' => '杭州',
    'region' => '测试1',
  ),
  'contact' => array(
    'phone' => '123456',
    'email' => 'xiaomi@example.com',
  ),
);
 
$arr2 = array(
  'name' => '小明',
  'age' => 22,
  'address' => array(
    'city' => '杭州',
    'region' => '测试2',
  ),
  'contact' => array(
    'phone' => '231111',
    'email' => 'xiaoming@example.com',
  ),
);

$diff1 = array_diff_assoc($arr1, $arr2);
print_r($diff1);