pagination AND sorting

[jeff5656]

Ok here's my pagination code and it works perfectly.  But I want to also be able to sort by column.  How do I make this work so that it also sorts by column.  Sorry for the long code but I wanted to give the full picture:

 

<?php
$tbl_name="active_consults";		//your table name
// How many adjacent pages should be shown on each side?
$adjacents = 3;
$query = "SELECT COUNT(*) as num FROM $tbl_name WHERE signoff_status = '$so' ";
$total_pages = mysql_fetch_array(mysql_query($query));
$total_pages = $total_pages[num];
/* Setup vars for query. */
$targetpage = "displayactive.php"; 	//your file name  (the name of this file)
$limit = 2; 								//how many items to show per page
$page = $_GET['page'];
if($page) 
	$start = ($page - 1) * $limit; 			//first item to display on this page
else
	$start = 0;								//if no page var is given, set start to 0
$query = "SELECT * FROM active_consults WHERE signoff_status = '$so' ";

$column_name=(isset($_GET['column_name']) ? $_GET['column_name'] : ''); 

if(strlen($column_name)>0){
$query = $query . " order by $column_name  LIMIT $start, $limit";
} 


else {
$query = $query . " ORDER BY patient_name  LIMIT $start, $limit";
}


$results = mysql_query ($query) or die (mysql_error());
$num_pts = mysql_num_rows ($results);

/* Setup page vars for display. */
if ($page == 0) $page = 1;					//if no page var is given, default to 1.
$prev = $page - 1;							//previous page is page - 1
$next = $page + 1;							//next page is page + 1
$lastpage = ceil($total_pages/$limit);		//lastpage is = total pages / items per page, rounded up.
$lpm1 = $lastpage - 1;						//last page minus 1

/* 
	Now we apply our rules and draw the pagination object. 
	We're actually saving the code to a variable in case we want to draw it more than once.
*/
$pagination = "";
if($lastpage > 1)
{	
	$pagination .= "<div class=\"pagination\">";
	//previous button
	if ($page > 1) 
		$pagination.= "<a href=\"$targetpage?page=$prev\">« previous</a>";
	else
		$pagination.= "<span class=\"disabled\">« previous</span>";	

	//pages	
	if ($lastpage < 7 + ($adjacents * 2))	//not enough pages to bother breaking it up
	{	
		for ($counter = 1; $counter <= $lastpage; $counter++)
		{
			if ($counter == $page)
				$pagination.= "<span class=\"current\">$counter</span>";
			else
				$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
		}
	}
	elseif($lastpage > 5 + ($adjacents * 2))	//enough pages to hide some
	{
		//close to beginning; only hide later pages
		if($page < 1 + ($adjacents * 2))		
		{
			for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
			{
				if ($counter == $page)
					$pagination.= "<span class=\"current\">$counter</span>";
				else
					$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
			}
			$pagination.= "...";
			$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
			$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";		
		}
		//in middle; hide some front and some back
		elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
		{
			$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
			$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
			$pagination.= "...";
			for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
			{
				if ($counter == $page)
					$pagination.= "<span class=\"current\">$counter</span>";
				else
					$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
			}
			$pagination.= "...";
			$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
			$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";		
		}
		//close to end; only hide early pages
		else
		{
			$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
			$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
			$pagination.= "...";
			for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)
			{
				if ($counter == $page)
					$pagination.= "<span class=\"current\">$counter</span>";
				else
					$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
			}
		}
	}
	$cols=$_GET['id1'];
	//next button
	if ($page < $counter - 1) 

		$pagination.= "<a href=\"$targetpage?page=$next\">next »</a>";
	else
		$pagination.= "<span class=\"disabled\">next »</span>";
	$pagination.= "</div>\n";		
}

 

And next is the columns (I only included one):

<th align="right">Name  
     <a  href="displayactive.php?column_name=patient_name"><img src="../consults/images/uparrow.gif" title="sort ascending (A-Z)" width="12" height="12" border="1" /></a>
     <div style="valign:bottom;float:right">
     <a href='displayactive.php?column_name=patient_name desc'> <img src="../consults/images/downarrow.gif" title="sort descending (Z-A)" width="12" height="12" border="0" /></a></div>
    
    
    </th>

[cags]

That code already seems to sort by column.... thats what ORDER BY is for.