$ _GET的奇怪问题

Question

I have a strange error with a $_GET Value. Im using thsi code for a query: array($_GET['cats'])

If I insert the get parameter manually, like: array(3,328) everything works fine. But if I use: array($_GET['cats']) and submit the cats by URl like ?cats=3,328 it does not work, What could be the issue?

Answer 1

You can't plug a value like that. array($_GET['cats']) is equivalent to array('3,328'), if the value of $_GET['cats'] is 3,328. So basically, the value is a string, not a list of integers. What you want is:

explode(',', $_GET['cats'])