I wish to have the ability to give a particular factor to everybody publish on my small blog according to that posts tags.

On my small category pages especially. So I am during my archive.php file and I wish to use if (is_tag()) to print some stuff according to when the tag can there be.

The issue is obviously that it is no longer working. I am presuming its because I can not make use of the is_tag on non tag pages?

[cde] informs you if the page being seen is really a tag archive page (a webpage that lists posts by tag). It's not a function to retrieve the tags for any publish. Use [cde] for your.

The correct usage is [cde].