html - PHP Invalid argument supplied for foreach() loop -


i trying make sure every column in database pull html first 2 columns pull. last 3 columns don't work. 2 text values , last column decimal. can please tell me missing? thank you! 

$colmname = $_post["colname"];    $colmvalue = $_post["colvalue"];    $count = 0;     if ($colmname = 'productid')     {       $thequery = "select * products                    productid = $colmvalue";       $rset = $db->query ($thequery);     }     elseif ($colmname = 'categoryid')      {       $thequery = "select * products                    categoryid = $colmvalue";       $rset = $db->query($thequery);      }     elseif ($colmname = 'productcode')      {       $thequery = "select * products                    (productcode = '$colmvalue')";       $rset= $db->query($thequery);      }     elseif ($colname = 'productname')    {       $thequery = "select * products                    (productname = '$colmvalue')";       $rset = $db->query ($thequery);      }     elseif ($colname = 'listprice')      {        $thequer = "select * products                    listprice = $colmvalue";        $rset = $db->query ($thequery);      }     else      {        echo ('enter valid column name products table , existing value.  either productid, categoryid, productcode, productname, or listprice.');        include (index.html);        exit ();      }//end if     foreach($rset $products)     {       $list .= $count.' '.$products['productid']                      .' '.$products['categoryid']                      .' '.$products['productcode']                      .' '.$products['productname']                      .' '.$products['listprice']                      .'<br>';       $count++;     }//foreach      echo ("<p>the data $colmname value of $colmvalue listed below:<p>"); //    echo ($list);//just check if works before putting in table //    echo ('<p>');//for spacing ?>   <doctype! html> <html>         <head>                 <title>product results</title>         </head>         <body>                 <section>                         <table border="1">                                 <tr><th>productid</th><th>categoryid</th><th>productcode</th><th>productname</th><th>listprice</th></tr>                                 <tr><td><?php echo $products['productid'];?></td><td><?php echo $products['categoryid'];?></td><td><?php echo $products['productcode'];$                         </table>                 </section>         </body> </html>

so long $db->query regular mysql_query() function, cannot use foreach. should use:

while ($products = mysql_fetch_assoc($rset)) {     $list .= $count.' '.$products['productid']                  .' '.$products['categoryid']                  .' '.$products['productcode']                  .' '.$products['productname']                  .' '.$products['listprice']                  .'<br>';     $count++; }

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