Set try catch in $_GET to give a null return if not set in addressbar
<p>Hi I'm currently building a page in PHP and I'm having a trouble on setting this one. It is currently running on my localhost. Well my page is in this folder </p>

<p><a href="http://localhost/signup/signup/" rel="nofollow">http://localhost/signup/signup/</a> </p>

<p>named index.php so it is the front page. My goal is to use this one for database update wherein I manually key in the $_GET value in the addressbar of the browser which will now look like this </p>

<p><a href="http://localhost/signup/signup/?email=email@yahoo.com" rel="nofollow">http://localhost/signup/signup/?email=email@yahoo.com</a>. </p>

<p>This will fill up my forms with the user information based on their email. Now I have a problem on how can I set the $_GET value into null (or blank space) so that I can use 
<a href="http://localhost/signup/signup/" rel="nofollow">http://localhost/signup/signup/</a> even without the email being set on the addressbar.</p>
