Validate $_GET variable

[clay1]

User clicks a URL which  sends user to a page ie: event.php?id=1000 where id=the id of an event in my table

 

What steps should I take to ensure that nothing nefarious is sent?

 

Thanks

[premiso]

Check if the value is_numeric then static cast the var to int:

 

$id = isset($_GET['id']) && is_numeric($_GET['id'])?(int) $_GET['id']:0;

 

The ternary operator (? : ) act as a shortened if / else. So if the get id has been set and it is numeric cast the id to int, else set id to 0.

[clay1]

Thanks!