Your URL is incorrect, FYI.
http://stackoverflow.com/questions/tagged/php or c%2b%2b or python or yii or c
That's what you want. Not escaping that plus is a recipe for pain.
Also, we have STRICT rules about mixing plus and space. If any of your tags has a plus, you MUST use spaces to delimit. Sorry, but that's the way the cookie crumbles when we allow tags with a plus in them.
So in short, you are doing this 99% wrong.
Also, I don't know how you arrived at a page that has "PHP, blah, blah, or blah Questions" in the tab-title. Which of our pages do that?