PHP: Using ?.... after file.php
<p>I have this:</p>

<pre><code>pm.php?v=unread
</code></pre>

<p>Now in unread, you can filter too by pressing Messages or Invites, and the links look like this:</p>

<pre><code>&lt;a href="?f=msgs"&gt;Msgs&lt;/a&gt; | &lt;a href="?f=invites"&gt;Inv.&lt;/a&gt;
</code></pre>

<p>If you are inside <code>pm.php?v=unread,</code> and press on Msgs, it will turn out as <code>pm.php?f=msgs</code>. 
And i wish it to be <code>pm.php?v=unread&amp;f=msgs</code></p>

<p>How can i do this?</p>
