php 查询两个数组中值相同的元素(并且去掉重复值)

$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));