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POSending a variable in PHP with a form to the same page, but I am getting error
 

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  1. POSending a variable in PHP with a form to the same page, but I am getting error
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    <p>Please Help, I am coding a page with PHP where users choose a subject, click on the link and are directed to a page where they can comment on.The user make use of a small form to comment on a subject. I am trying to submit the form to the same page. So that the comment that the user submitted will display immediatly. I am sending a variable with the form using the GET method, but I am getting: Database query failed: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1,</p> <p>but it is writing to my database, just not displaying the data</p> <p>Here is my code(before head):</p> <pre><code>&lt;?php // GET subject_id from previous page and see if it has been set if (isset($_GET['subj'])) { subject_id = $_GET['subj']; } else { $subject_id = NULL; } // process form that was submitted to same page if (isset($_POST['submit'])) { $subject_id = mysql_prep($_GET['subj']); $commentbox = trim(mysql_prep($_POST['commentbox'])); $query = "INSERT INTO comments ( subject_id, content ) VALUES ( {$subject_id}, '{$commentbox}' )"; if ($result = mysql_query($query, $connection)) { // as is, $message will still be discarded on the redirect $message = "The page was successfully created."; redirect_to("blog_subject.php"); } else { $message = "The page was unsuccessfully created."; redirect_to("blog_subject.php"); } } ?&gt; </code></pre> <p>......and then the code to display the subject,comments and form...</p> <pre><code>&lt;?php // Retrieving Subject Name from subjects database global $connection; if (isset($_GET['subj'])) {$subject_id = $_GET['subj'];} $query = "SELECT * FROM subjects WHERE subject_id = {$subject_id}"; $result_set = mysql_query($query, $connection); if (!$result_set) {die("Database query Failed: " . mysql_error());} if ($subject_set = mysql_fetch_array($result_set)) { echo $subject_set['subject_name']; } else { return NULL; } ?&gt; &lt;br /&gt; &lt;?php // Retrieving Comments from comments database global $connection; $subject_id = $_GET['subj']; $comment_set = mysql_query("SELECT * FROM comments WHERE subject_id = {$subject_id}", $connection); if (!$comment_set) { die("Database query Failed: " . mysql_error()); } echo "&lt;ul class=\"pages\"&gt;"; while ($comment_for_subject = mysql_fetch_array($comment_set)) { echo "&lt;li&gt;{$comment_for_subject["content"]}&lt;/li&gt;"; } echo "&lt;/ul&gt;"; ?&gt; &lt;br /&gt; &lt;form action="blog_subject.php?subj=&lt;?php echo $subject_id_van_vorige_bladsy; ?&gt;" method="post"&gt; &lt;textarea name="commentbox" cols="100" rows="10"&gt;&lt;/textarea&gt;&lt;br /&gt; &lt;input name="submit" type="submit"&gt; &lt;/form&gt; </code></pre>
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