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    <p>First, I would like to address the original question. As there are already answers for the obvious <code>isset()</code> .. I would like to point out that 1) You don't need to check for the existence of <code>$_GET</code> prior, it's just wasted code. So the examples such as:</p> <pre><code>if(isset($_GET['errormsg']) { echo $_GET['errormsg']; } </code></pre> <p>are indeed correct usage. I would like to also point out you will get PHP Notices &amp; Warnings <strong>anytime</strong> you use <code>$_GET['foo']</code> without it being initialized first. So for example, this <strong>will</strong> produce a notice: (Note: In the below examples I changed "errormssg" to "errormsg", note the removal of the double "s")</p> <pre><code>$errormsg = stripslashes(str_replace("'","",$_GET['errormsg'])); if(isset($errormsg)) { echo $errmsg; } </code></pre> <p>In fact, that code is very redundant, since unless the code changes, <code>$errmsg</code> will always be set. To use this properly, you would want to say something like:</p> <pre><code>if(isset($_GET['errormsg'])) { $errormsg = stripslashes(str_replace("'","",$_GET['errormsg'])); echo $errormsg; } </code></pre> <p>I would also like to point out the usage of <code>!empty()</code> as well. <code>!empty()</code> is different than <code>isset()</code> that can be demonstrated with the following example:</p> <pre><code>$x = ''; if(isset($x)) { echo 'This will fire, since $x *is* set, just empty'; } if(!empty($x)) { echo 'This will not fire, even though $x is set, it is empty'; } </code></pre> <p>Although for your example, it will only make unnoticeable differences more than likely.</p> <p>Secondly, although not related directly to the original question, I would like to point out your use of <code>header()</code> and URLs is highly incorrect:</p> <pre><code>header("Location:contact.php?errormssg='You seem to have forgotten one of the fields'"); </code></pre> <p>This is all wrong. You <strong>should</strong> instead use something like this:</p> <p>header("Location: contact.php?errormsg=" . urlencode("You seem to have forgotten one of the fields"));</p> <p>Note the space between Location: and the URL. Technically, this is <strong>still</strong> incorrect but will work. The 100% proper way to do it (according to the RFC) would be to include the <strong>full</strong> URL in the header, such as:</p> <pre><code>header("Location: http://www.yoursite.com/contact.php?errormsg=" . urlencode("You seem to have forgotten one of the fields")); </code></pre> <p>You will not need your <code>stripslashes()</code> if you URL escape/encode your data properly.</p>
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