array_diff_assoc:同时根据数组键和值,计算数组的差集

 
$arr1 = ['a'=>'aaa','b'=>'bbb',1=>'1',2=>2];
$arr2 = ['a'=>'bbb','b'=>'ccc',2=>2];
$arr = array_diff_assoc($arr1,$arr2);
  
echo '<pre>';
print_r($arr);
  
result:
Array
(
    [a] => aaa
    [b] => bbb
    [1] => 1
)