array_intersect_key:根据键名计算数组的交集

1. [代码]array_intersect_key    

$arr1 = ['a'=>'abc','b'=>'bbb','c'=>'cbd'];
$arr2 = ['a'=>'ccc','c'=>'aaa','e'=>'eee'];
$arr = array_intersect_key($arr1, $arr2);

echo '<pre>';
print_r($arr);

result:
Array
(
    [a] => abc
    [c] => cbd
)