php - 检查数组是否包含其他数组的所有元素？

Question

我有 2 个数组，第二个数组必须包含第一个数组中的所有元素，如何检查？谢谢

For example

array 1: Array ( [0] => Email [1] => 1_Name )
array 2:  Array ( [0] => 1_Name [1] => ) 

In this case it is invalid , as array 2 do not have Email

array 1: Array ( [0] => Email [1] => 1_Name )
array 2:  Array ( [0] => 1_Name [1] => Address [2]=> Email )

 In this case it is valid 

Answer 1

使用array_intersect()并测试其输出长度是否相同:

if (count(array_intersect($arr1, $arr2)) === count($arr1)) {
  // contains all
}

对于键也必须匹配的关联数组，使用 array_intersect_assoc()相反。