Pagination Links Not Directing Properly - php

Question

I'm new to PHP, and I'm developing a PHP plugin for CraftCMS.
On my local dev machine, this code was working; however, on the server, the pagination links are not directing properly.
This is a plugin which imports an XML feed and paginates the results.
For example, when using 'PHP_SELF' in the code, the link redirects to the index page, and when using 'REQUEST_URI,' the link works correctly the first time, yet is appended with each successive URI.
I was wondering if there would be a work around or better method for correcting this problem?
This version takes you back to the home page:
code:
echo '<< < ';
while this version appends the querystring each time:
e.g. http://mypage/test?page=1&page=2
code:
echo '<< < ';

Answer 1

Here is what is happening
The first time you use $_SERVER['REQUEST_URI'] the URL on the address bar (which is the value returned by $_SERVER['REQUEST_URI']) is http://mypage
Now say you click on the "First" button, you get redirected to $_SERVER['REQUEST_URI'].'?page=1#rss' so now your URL on the address bar reads http://mypage?page=1#rss
So now what happens when you click on "First" again? The text ?page=1#rss is appended to the already existing request Uri i.e http://mypage?page=1#rss. So the result is? You guessed it
http://mypage/test?page=1#rss&page=1#rss
To avoid this, you need to strip the querystring (the part following the ?) from the request Uri and there exists a wonderful SO answer to help you do just that
So your code should look like
$url=strtok($_SERVER["REQUEST_URI"],'?');
echo '<< < ';