PHP arrays: cross data

Question

An student here who needs help with the logic of the following:

I have two arrays.

$array1 contains the ids of the places the user has been to.

$array2 contains the ids of the places where the user can obtain one point just by visiting them

Now I need to know if the user has visited any of the places where he/she can get one point so I can grant it to him/her. How can I do that?

Tnaks a lot

Answer 1

Looks like you want to try array_intersect

$intersection = array_intersect($array1, $array2);

Answer 2

count(array_intersect($array1, $array2)) should then give you the number of suych places.