## 取出两个数组中相同的内容 ``` $arr1=array("0"=>"17","1"=>"20","2"=>"36","3"=>"48"); $arr2=array("0"=>"17","1"=>"36","3"=>"57"); $arr3=array_intersect($arr1,$arr2); var_dump(array_unique($arr3)); ``` >注：`array_intersect` 是取交集，`array_unique` 是移除数组中重复的值