I want to identify if a PHP script is being called inside an iframe of a different host. I could resort to using Javascript for that, but I'd like to find a JS-free solution first.

Şu anda ben bu mantığı kullanıyorum:

If $_SERVER['HTTP_HOST'] is not equal to the host name of $_SERVER['HTTP_REFERER']
And $_SERVER['REDIRECT_STATUS'] is defined
Then the script is being called from inside an iframe on a different host.

I know this is by no means accurate, but it passed all tests so far.
Does somebody know a better solution, an extra condition I could check to be sure of this? Thanks.

SOLVED: Finally, I decided to go with JS. Now the two alternative contents are each inside a <div> and a JS script decides which one to show and which one to hide.