Verify variable in an array

[rbush]

I want to verify if a variable $userid is in array $user.
If the $userid is in the $user array, I want to load an xml file for that $userid.

How is this possible?

I have been searching for an example to do this, but can't seem to find one.

[Beverleyh]

in_array() ?

If you Google "find value in array" you will find lots of examples.