Referencing a certain section of a script

Question

I am sending out a request to a site, which needs a returning URL. Once that returning URL is put in, I'd like to run this particular section of my code.

How do I do this?

I have tried the return URL as :

file.php?auth=true

and

if($_GET['auth'] == 'true') {
 Do Something
}

But the previous page appears to load.

Is there any other way to do it?

Answer 1

You've got syntax error on the first line

It should be

if($_GET['auth'] == 'true') {

but yes, this is correct way to do it