Signature laten posten in de database

<?php
include 'connect.php';
include 'header.php';

//gets the ID of the board that the topic is going to be created on, using HTTP GET
$bid = mysql_real_escape_string($_GET['bid']);
$uid = mysql_real_escape_string($_GET['uid']);

//ensures that the user is logged in (you must be logged in to post!)
if($_SESSION['signed_in'])
{
	//this query fetches the board that the topic will be created on, and detects if the board exists
	//if the board does not exist, a 404 error is returned
	$levelQuery = "SELECT signature FROM users WHERE user_id = $uid";
	$levelResult = mysql_query($levelQuery);

	{
		if ($levelRow['users'] <= $_SESSION['user_level'])
		{
			//this checks to ensure that the user is a high enough level to create a topic on the board.

			if($_SERVER['REQUEST_METHOD'] != 'POST')
			//this checks to see if there is a current HTTP POST request. If so, the form is processed. If not, a new form is displayed
			{
			    echo '<form method="post" action="">
				      Signature: <input type="text" maxlength=80 name="topic-title" /><br />
				      <input type="submit" value="post signature" />
				      </form>';
			}

			else //There is a current POST request to be processed.
			{
				//Note the use of the strip_tags() function. This PHP function discards
				//any HTML tags that are input by the user in their posts, which can often
				//create glitches and exploits.
			    $value1 = strip_tags(mysql_real_escape_string($_POST['signature']));
			    $value3 = $_SESSION['user_id'];
				  
				//this sql query creates a new topic, with the subject being specified by the user
			    $sql = "INSERT INTO users (user_id, user_name, user_pass, user_email, user_date, user_level, avatar, signature) 
						VALUES ('$value1', '$value3')";

			    $result = mysql_query($sql);
			    if(!$result)
			    {
					die('Error: ' . mysql_error());
			    } else 
				{	//if there is no error creating the topic, we will create the first post in the topic
					//this function returns the ID of the topic that we just created, so we can use the topic ID
					//when we are adding the first post to the database
					$tid = mysql_insert_id();
					$messageText = strip_tags(mysql_real_escape_string($_POST['topic-message']), '<p><br>');
				  

					$result2 = mysql_query($addMessage);
					$result3 = mysql_query($updateTopicTime);
			
					if(!$result2)
					{
						die('Error: ' . mysql_error());
			        } else 
					{	//if there are no errors with posting, this confirmation message is returned
						//a link back to the current topic is constructed based on the topic id
            			echo '<div class="error">Signature posted. <a href="me.php">Return Here</a></div>';
            		}
			    }
			}
	    } else 
		{	//if the user is not a high enough level to create topics, this message is returned.
			echo '<div class="error"><B>Access Restricted</B>: You do not have permission to create topics on this board. <a href="index.php">Return to Home</a></div>';
	    }
	}
}
else
{ //if the user is not logged in, they cannot create any topics.
	echo '<div class="error">You must be <a href="login.php">logged in</a> to do that.</div>';
}

include 'footer.php';
?>