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Order by column header


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Does anyone know if there's a tutorial which shows you how to 'order by' a particular column?

I'm going to have my data displayed in a table like this:


I want the user to be able to click on the column heading and it will sort it oposite to how it's currently sorting it, similar to [url=http://www.ebuyer.com/customer/search/?strSearch=&intSubcatUID=849&bolShowAll=true&intMfrID=411]this page[/url].  If you click on the price heading it sorts it either ascending or descending, based on how it's currently displayed.

I've been messing about and haven't really come close.  I'll post some code examples shortly.

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Here's what I have that works, but I wondered if there's an easier way?

  // Connect to my db
  // Get url params for the 'order by' if they're set
  if (isset($_GET['orderby']) && isset($_GET['orderdir'])){
  $orderby = $_GET['orderby'];
  $orderdir = $_GET['orderdir'];

  // Select all my records
  $sql = "SELECT * FROM tblCountry";
  // If 'order by' was set then concatenate the string
  if ($orderby){
  $sql .= " ORDER BY $orderby $orderdir";

  // Execute the SQL result
  $result = mysql_query($sql);
  if (!result){
      echo "There was a problem selecting the countries" . mysql_error();
  // Decide what the last link pressed was and then change the next link accordingly
  $orderdir = ($orderdir == "desc") ? "asc" : "desc";

  // Here's where I output my column headings with the links
  echo <<<HTML
<table width="300">
  <td bgcolor="#000000">
  <table width="300" cellpadding="2" cellspacing="1" border="0">
    <tr bgcolor="#FFFFFF">
    <td width="75" align="center"><a href="datatab.php?orderby=countryID&orderdir=$orderdir">ID</a></td>
    <td width="225" align="center"><a href="datatab.php?orderby=countryName&orderdir=$orderdir">Country</td>


  while($row = mysql_fetch_array($result, MYSQL_ASSOC)){
      $id = $row['countryID'];
      $country = $row['countryName'];
      echo <<<HTML
    <tr bgcolor="#FFFFFF">
    <td width="75" align="center">$id</td>
    <td width="225" align="left">$country</td>

  echo <<<HTML

You can see what it looks like here: [url=http://dizzie.co.uk/php/datatab.php]Dizzie.Co.Uk[/url]

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