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01/22/2008 at 07:17AM PST, ID: 23101341
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6.2

PHP page running SQL statement twice or incorrectly running it

Asked by HarpuaFSB in PHP and Databases, MySQL Server, PHP Scripting Language

Tags: PHP, MySQL

I'm writing forum code and I've run into a very bizarre problem that I can't seem to figure out, it's driving me crazy.

Anyway, there's a part of the code where I run a SQL statement when a user views a topic that increments the counter for the times that topic has been viewed.

However, everytime the page is loaded, it increments the counter by two instead of one

The code in question:
$sql = "UPDATE forums_topics ";
$sql .= "SET topic_views = topic_views + 1 ";
$sql .= "WHERE topic_id = " . $topic_id;

You can see it in context of the rest of the page below.  For the life of me I can't figure out why it's incrementing the topic_views field by two instead of one each time that query is run.

If I run the code elsewhere or in a query window, it increments the counter by one, properly.

Anyone have any ideas?

Very perplexing! 
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<?php
	include "../library/dbconnect.php";	
	include "../library/sessionhandler.php"; 
 
	$userid = $_SESSION["userid"];
	$topic_id = $_GET["id"];
 
	if (!isset($topic_id))
	{ 
	mysql_close();
	header ("Location:index.php"); 
	exit();
	}
	
	$sql = "SELECT COUNT(*) ";
	$sql .= "FROM forums_posts ";
	$sql .= "WHERE topic_id = " . $topic_id;
	$safesql = & new SafeSQL_MySQL;
	$sql = $safesql->query($sql);			
	$recordset = mysql_query($sql);		
	if (mysql_num_rows($recordset) == 0)
	{
	mysql_close();
	header ("Location:index.php"); 
	exit();
	}
 
	$sql = "SELECT f.forum_name, ";
	$sql .= "t.* ";
	$sql .= "FROM forums_forums f, ";
	$sql .= "forums_topics t ";
	$sql .= "WHERE t.forum_id = f.forum_id AND ";
	$sql .= "t.topic_id = " . $topic_id;
	$safesql = & new SafeSQL_MySQL;
	$sql = $safesql->query($sql);			
	$recordset = mysql_query($sql);		
	if (mysql_num_rows($recordset) == 0)
	{
	mysql_close();
	header ("Location:index.php"); 
	exit();
	}
	
	$forum_name = mysql_result($recordset, 0, "forum_name");
	$forum_id =  mysql_result($recordset, 0, "forum_id");
	$topic_title = mysql_result($recordset, 0, "topic_title");	
 
	$sql = "UPDATE forums_topics ";
	$sql .= "SET topic_views = topic_views + 1 ";
	$sql .= "WHERE topic_id = " . $topic_id;
	mysql_select_db($mysql);
	mysql_query($sql);	
 
	$isadministrator = false;
	if (isset($_SESSION["userid"]))
	{
	$sql = "SELECT administrator ";
	$sql .= "FROM users ";
	$sql .= "WHERE userid = " . $_SESSION["userid"] . " AND ";
	$sql .= "administrator = -1";
	$safesql = & new SafeSQL_MySQL;
	$sql = $safesql->query($sql);			
	$recordset = mysql_query($sql);		
	if (mysql_num_rows($recordset) > 0)
		{ $isadministrator = true; }
	}
?>
<html lang="en">
<head>
	<title>Find Your Geek | Forums | <?php echo $topic_title; ?></title>
	<meta name="description" content="" />
	<meta name="keywords" content="" />		
	<link href="../library/style.css" rel="stylesheet" type="text/css" media="screen, projection" />
    <link href="library/forum.css" rel="stylesheet" type="text/css" media="screen, projection" />
	<script type="text/javascript" src="../library/imagerollover.js"></script>
	<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
</head>
<body>
<div align="center">
	<?php include "../library/header.php" ?>
	<?php include "../library/menu.php" ?>
    <table width="760px" cellpadding="0px" cellspacing="0px">
		<?php
			if (isset($_SESSION["errormessage"]))
				{
				$paddingtop = "";
		?>
				<tr>
					<td style="padding-left:11px;padding-top:5px;" colspan="2">
						<font color="red">
						<b>
						<?php echo $_SESSION["errormessage"]; ?>
						</b>
						</font>
					</td>
				</tr>
				<tr><td style="padding-left:11px;padding-right:11px;" colspan="2"><hr size="1px" color="#ffc600"></td></tr>
		<?php
				}
			else
				{ $paddingtop = "padding-top:5px;"; }
		?>
    	<tr>
        	<td style="width:380px;padding-left:11px;<?php echo $paddingtop; ?>">
            	<a href="index.php"><img src="images/up_arrow.gif" border="0px"></a>&nbsp;<a href="index.php">Index</a>
                <b>&nbsp;&laquo;&nbsp;</b>
                <a href="viewforum.php?id=<?php echo $forum_id; ?>"><?php echo $forum_name; ?></a>
           	</td>
            <td style="width:380px;padding-right:11px;padding-top:5px;" align="right"></td>
        </tr>
        <tr><td height="10px" colspan="2"></td></tr>
        <tr>
        	<td style="padding-left:11px;" colspan="2">
            	<font style="font-size:20px;font-weight:bold;">
            		<?php echo $topic_title; ?>
                </font>
            </td>
        </tr>
        <tr><td height="10px" colspan="2"></td></tr>
        <tr>
        	<td style="padding-left:11px;">
            	<a href="posting.php?mode=reply&tid=<?php echo $topic_id; ?>"><img src="images/postreply_off.gif" srcover="images/postreply_on.gif" border="0px"></a>
            </td>
            <td style="padding-right:11px;" align="right">
            	<?php
					//Pagination
					$page = $_GET["page"];
					$limit = 25; 
 
					$select = "SELECT s.sessionid, ";
					$select .= "u.displayname, ";
					$select .= "u.avatar, ";
					$select .= "u.title, ";
					$select .= "u.signature, ";
					$select .= "u.posts, ";
					$select .= "u.hideonlinestatus, ";
					$select .= "u.lastlogindatetime, ";
					$select .= "u.administrator, ";
					$select .= "p.* ";
					$from = "FROM users u, ";
					$from .= "forums_posts p ";
					$from .= "LEFT JOIN sessions s ";
					$from .= "ON p.poster_id = s.sessionuserid ";
					$where = "WHERE p.poster_id = u.userid AND ";
					$where .= "p.topic_id = " . $topic_id . " ";
					$orderby = "ORDER BY post_time ";
 
					$resultcount = mysql_query("SELECT COUNT(*) " . $from . $where); 
					
					if (mysql_num_rows($resultcount) > 0)
						{					
						$totalrows = mysql_result($resultcount, 0);  			
						$numofpages = ceil($totalrows / $limit); 
						if(empty($page))
							{ 
							$page = 1; 
							$limitvalue = 0;
							} 
						else
							{ $limitvalue = $page * $limit - ($limit); }						
						
						if ($page != 1)
							{
							$pageprev = $page - 1;
							$previous = "<a href=\"viewtopic.php?id=" . $topic_id . "&page=" . $pageprev . "\">&laquo;&nbsp;Prev</a>";
							}
						if ($numofpages > 1)
							{
							for ($count = 1; $count <= $numofpages; $count++)
								{ 
								if ($count == $page)
									{ $pages .= $count . "&nbsp;&nbsp;"; }
								else
									{ $pages .= "<a href=\"viewtopic.php?id=" . $topic_id . "&page=" . $count . "\">" . $count . "</a>&nbsp;&nbsp;"; } 
								} 
							}
						if ($totalrows - ($limit * $page) > 0)
							{
							$pagenext = $page + 1;
							$next = "<a href=\"viewtopic.php?id=" . $topic_id . "&page=" . $pagenext . "\">Next&nbsp;&raquo;</a>";
							} 
						}
					$safesql = & new SafeSQL_MySQL;
					$sql = $safesql->query($select . $from . $where . $orderby . "LIMIT " . $limitvalue . ", " . $limit);				
					$postsrecordset = mysql_query($sql);												
				
					if ($numofpages == 0) { $numofpages = 1; }
				
					echo mysql_num_rows($postsrecordset); 
					echo "&nbsp;";
					if (mysql_num_rows($postsrecordset) == 1)
						{ echo "post"; }
					else
						{ echo "posts"; }
				?>
				&nbsp;&bull;&nbsp;
                Page&nbsp;<?php echo $page . "&nbsp;of&nbsp;" . $numofpages; ?>
                <?php if ($pages) { echo "&nbsp;&bull;&nbsp;" . $pages; } ?>
            </td>
        </tr>
   	</table>
    <div style="height:5px;"></div>
    <table width="760px" cellpadding="0px" cellspacing="0px">
        <?php 
			$count = 0;
			while ($count < mysql_num_rows($postsrecordset))		
			{
				if ($count % 2 == 1)
					{ $trid = "topic_rowA"; }
				else
					{ $trid = "topic_rowB"; }	
				if ($count + 1 == mysql_num_rows($postsrecordset))
					{ $borderbottom = "border-bottom:#ffc600 1px solid;"; }
				else
					{ $borderbottom = ""; }						
		?>
				<tr id="<? echo $trid; ?>">
					<td style="width:200px;border-top: #ffc600 1px solid;<?php echo $borderbottom; ?>padding: 11px 11px 11px 11px;" valign="top">
						<?php 
							if (mysql_result($postsrecordset, $count, "avatar") != null)
								{ 
								echo "<a href=\"../profile.php?id=" . mysql_result($postsrecordset, $count, "poster_id") . "\">";
								echo "<img src=\"" . mysql_result($postsrecordset, $count, "avatar") . "\" border=\"0px\">";
								echo "</a><br />";
								}
							if (mysql_result($postsrecordset, $count, "administrator"))
								{ echo "<a href=\"../administrators.php\"><img src=\"../images/administrator_esm.gif\" border=\"0px\"></a>&nbsp;"; }
							echo "<a href=\"../profile.php?id=" . mysql_result($postsrecordset, $count, "poster_id") . "\">";
							echo "<b>" . mysql_result($postsrecordset, $count, "displayname") . "</b>";
							echo "</a><br />";
							if (mysql_result($postsrecordset, $count, "title") != null)
								{ echo mysql_result($postsrecordset, $count, "title"); }
							//online / offline
							echo "<table style=\"padding-top:15px;padding-bottom:15px;\" width=\"100%\" cellpadding=\"0px\" cellspacing=\"0px\">";
							echo "<tr>";
							if (mysql_result($postsrecordset, $count, "sessionid") == null)
								{ 
								echo "<td width=\"20px\">";
								echo "<img src=\"../images/offline.gif\">&nbsp;"; 
								echo "</td>";
								echo "<td>";
								echo "<font style=\"font-size:9px;color:#ff2f15\"><b>Offline</b></font>";
								echo "</td>";
								}
							else
								{
								//add hidden code here
								echo "<td width=\"20px\">";
								echo "<img src=\"../images/online.gif\">&nbsp;"; 
								echo "</td>";
								echo "<td>";
								echo "<font style=\"font-size:9px;color:#84ff15\"><b>Online</b></font>";
								echo "</td>";								
								}
							echo "</tr>";
							echo "</table>";
							echo "Posts: " . mysql_result($postsrecordset, $count, "posts");
						?>
					</td>
                    <td style="width:560px;border-top: #ffc600 1px solid;<?php echo $borderbottom; ?>border-left: #ffc600 1px solid;" valign="top">
						<table width="100%" cellpadding="0px" cellspacing="0px">
							<tr>
								<td style="padding-left:11px;padding-top:11px;">
                                	<a name="p<?php echo mysql_result($postsrecordset, $count, "post_id"); ?>"></a>
                                    <font style="font-size:12px;">
									<b>
									<a href="#p<?php echo mysql_result($postsrecordset, $count, "post_id"); ?>"><?php echo mysql_result($postsrecordset, $count, "post_subject"); ?></a>
									</b>
									</font>
								</td>
								<td style="padding-right:11px;padding-top:5px;" align="right">
									<a href="posting.php?mode=quote&pid=<?php echo mysql_result($postsrecordset, $count, "post_id"); ?>"><img src="images/quote_button_off.gif" srcover="images/quote_button_on.gif" border="0px"></a>
									<?php
										if (isset($_SESSION["userid"]))
											{
											if ($isadministrator || $_SESSION["userid"] == mysql_result($postsrecordset, $count, "poster_id"))
												{
									?>
												&nbsp;&nbsp;&nbsp;&nbsp;<a href="posting.php?mode=edit&pid=<?php echo mysql_result($postsrecordset, $count, "post_id"); ?>"><img src="images/edit_off.gif" srcover="images/edit_on.gif" border="0px"></a>
									<?php	
												}
											if ($isadministrator)
												{
									?>
												&nbsp;&nbsp;&nbsp;&nbsp;<a href="posting.php?mode=delete&pid=<?php echo mysql_result($postsrecordset, $count, "post_id"); ?>"><img src="images/delete_off.gif" srcover="images/delete_on.gif" border="0px"></a>
									<?php	
												}	
											}
									?>
								</td>
							</tr>
							<tr><td colspan="2" style="height:5px;"></td></tr>
							<tr>
								<td colspan="2" style="padding-left:11px;">
									<a href="#p<?php echo mysql_result($postsrecordset, $count, "post_id"); ?>"><img src="images/post.gif" border="0px"></a>&nbsp;by&nbsp;
									<a href="../profile.php?id=<?php echo mysql_result($postsrecordset, $count, "poster_id"); ?>"><b><?php echo mysql_result($postsrecordset, $count, "displayname") ?></b></a>&nbsp;on&nbsp;
									<?php echo date("M d, Y g:i a", mysql_result($postsrecordset, $count, "post_time")) . " EST"; ?>
								</td>
							</tr>	
							<tr><td colspan="2" style="height:10px;"></td></tr>
							<tr>
								<td colspan="2" style="padding-left:11px;padding-right:11px;">
									<!-- post text -->
									<font style="font-size:1.2em;">
									<?php 
										echo FormatBBCode(mysql_result($postsrecordset, $count, "post_text"), $count);
									?>
									</font>
									<?php 
										if (mysql_result($postsrecordset, $count, "signature") != null)
											{
									?>
											<br /><br />
											<table style="width:100%;border-top:#ffc600 1px solid;" cellpadding="0px" cellspacing="0px">
												<tr>
													<td style="padding-top:10px;padding-bottom:10px;">
													<?php echo FormatBBCode(mysql_result($postsrecordset, $count, "signature")); ?>
													</td>
												</tr>
											</table>
									<?php
											}
									?>
 								</td>
							</tr>						
						</table>
					</td>
				</tr>
		<?php
				$count++;	
			}
        	if ($previous || $pages || $next) { 
		?>
            <tr id="header">
                <td colspan="3" style="padding-left:11px;"><?php echo $previous; ?></td>
                <td colspan="2" style="padding-right:11px;" align="right"><?php echo $next; ?></td>
            </tr>
        <?php } ?>
    </table>
    <table width="760px" cellpadding="0px" cellspacing="0px">
        <tr><td height="10px" colspan="2"></td></tr>
        <tr>
        	<td style="padding-left:11px;">
            	<a href="posting.php?mode=reply&tid=<?php echo $topic_id; ?>"><img src="images/postreply_off.gif" srcover="images/postreply_on.gif" border="0px"></a>
            </td>    
        	<td style="padding-right:11px;" align="right">   
                <?php 
					echo mysql_num_rows($postsrecordset); 
					echo "&nbsp;";
					if (mysql_num_rows($postsrecordset) == 1)
						{ echo "post"; }
					else
						{ echo "posts"; }
				?>
                &nbsp;&bull;&nbsp;
                Page&nbsp;<?php echo $page . "&nbsp;of&nbsp;" . $numofpages; ?>
                <?php if ($pages) { echo "&nbsp;&bull;&nbsp;" . $pages; } ?>
          	</td>
      	</tr>           
		<tr><td height="5px" colspan="2"></td></tr>  	
		<tr>
        	<td style="padding-left:11px;">
            	<a href="index.php"><img src="images/up_arrow.gif" border="0px"></a>&nbsp;<a href="index.php">Index</a>
                <b>&nbsp;&laquo;&nbsp;</b>
                <a href="viewforum.php?id=<?php echo $forum_id; ?>"><?php echo $forum_name; ?></a>
           	</td>
            <td></td>
        </tr>
		<tr><td height="5px" colspan="2"></td></tr> 
   	</table>
    <div style="height:5px;"></div>
	<img src="../images/line.gif">
	<p><?php include "../library/footer.php" ?></p>    
</div>
</body>
</html>
<?php 
	unset($_SESSION["errormessage"]);
 
	mysql_close(); 
 
	function FormatBBCode($message) 
	{
	$simple_search = array(
							'/\:\)/is',
							'/\;\)/is',
							'/\:\(/is',
							'/\:cool:/is',
							'/\:mad:/is',
							'/\:confused:/is',
							'/\:shock:/is',
							'/\:bigsmile:/is',
							'/\:oops:/is',
							'/\:roll:/is',
							'/\:twisted:/is',
							'/\:lol:/is',
							'/\:neutral:/is',
							'/\:drool:/is',
							'/\:ninja:/is',
							'/\[b\](.*?)\[\/b\]/is',                                
							'/\[i\](.*?)\[\/i\]/is',                                
							'/\[u\](.*?)\[\/u\]/is',
							'/\[url\](.*?)\[\/url\]/is',
							'/\[url\=(.*?)\](.*?)\[\/url\]/is',
							'/\[img\](.*?)\[\/img\]/is',
							'/\[quote\](.*?)\[\/quote\]/is',
							'/\[quote\=(.*?)\](.*?)\[\/quote\]/is',
							'/\[youtube\](.*?)\[\/youtube\]/is',
							'/\[spoiler\](.*?)\[\/spoiler\]/is',
							'/\[nsfw\](.*?)\[\/nsfw\]/is'
							);
	
	$simple_replace = array(
							'<img src="../images/smileys/smile.gif">',
							'<img src="../images/smileys/wink.gif">',
							'<img src="../images/smileys/sad.gif">',
							'<img src="../images/smileys/cool.gif">',
							'<img src="../images/smileys/mad.gif">',
							'<img src="../images/smileys/confused.gif">',
							'<img src="../images/smileys/shock.gif">',
							'<img src="../images/smileys/bigsmile.gif">',
							'<img src="../images/smileys/oops.gif">',
							'<img src="../images/smileys/eyeroll.gif">',
							'<img src="../images/smileys/twisted.gif">',
							'<img src="../images/smileys/laugh.gif">',
							'<img src="../images/smileys/neutral.gif">',
							'<img src="../images/smileys/drool.gif">',
							'<img src="../images/smileys/ninja.gif">',
							'<b>$1</b>',
							'<i>$1</i>',
							'<u>$1</u>',
							'<a href="$1" target="_new">$1</a>',
							'<a href="$1" target="_new">$2</a>',
							'<img src="$1">',
							'<table width="90%" style="background:#2a2a2a;border:1px solid #555555;padding-bottom:5px;" cellspacing="1px" cellpadding="3px" align="center"><tr><td style="font-size:11px;"><img src="images/quote.gif"></td></tr><tr><td style="font-size:12px;">$1</tr></table>',
							'<table width="90%" style="background:#2a2a2a;border:1px solid #555555;padding-bottom:5px;" cellspacing="1px" cellpadding="3px" align="center"><tr><td style="font-size:11px;"><img src="images/quote.gif">&nbsp;<b>$1&nbsp;wrote:</b></td></tr><tr><td style="font-size:12px;">$2</tr></table>',
							'<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/trim($1)"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/$1" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>',
							"<div style=\"margin-top:5px\"><div><font style=\"font-size:12px;\"><b>Spoiler:</b></font>&nbsp;&nbsp;<input type=\"button\" value=\"Show\" style=\"width:45px;font-size:10px;margin:0px;padding:0px;\" onclick=\"if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = '';this.value = 'Hide'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none';this.innerText = '';this.value = 'Show'; }\" /></div><div class=\"quotecontent\"><div style=\"display: none;\"><br />$1</div></div></div>",
							"<div style=\"margin-top:5px\"><div><font style=\"font-size:12px;\"><b>NSFW:</b></font>&nbsp;&nbsp;<input type=\"button\" value=\"Show\" style=\"width:45px;font-size:10px;margin:0px;padding:0px;\" onclick=\"if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = '';this.value = 'Hide'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none';this.innerText = '';this.value = 'Show'; }\" /></div><div class=\"quotecontent\"><div style=\"display: none;\"><br />$1</div></div></div>"
						);
	$message = preg_replace ($simple_search, $simple_replace, $message);
	return nl2br($message);
	}
?>
[+][-]01/22/08 07:44 AM, ID: 20715221

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[+][-]01/22/08 08:13 AM, ID: 20715505

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[+][-]01/22/08 08:29 AM, ID: 20715680

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About this solution

Zones: PHP and Databases, MySQL Server, PHP Scripting Language
Tags: PHP, MySQL
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Solution Provided By: mdougan
Participating Experts: 1
Solution Grade: A
 
 
[+][-]01/22/08 08:48 AM, ID: 20715852

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[+][-]01/22/08 09:02 AM, ID: 20715961

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[+][-]01/22/08 09:11 AM, ID: 20716033

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[+][-]01/22/08 10:12 AM, ID: 20716522

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[+][-]01/22/08 10:18 AM, ID: 20716578

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[+][-]01/22/08 10:59 AM, ID: 20717099

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[+][-]01/22/08 11:03 AM, ID: 20717139

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[+][-]01/22/08 11:29 AM, ID: 20717397

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[+][-]01/22/08 11:52 AM, ID: 20717626

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