Getting $ GET variable name/key

How to retrieve GET variable name

[ayub_zar]

hello everyone :D,

I am trying to do pagination of resultset that involves 2 GET variables, 1st one is 'page' and second is 'category'.

I get correct results when i query 1st page (user selected category + first page) which is:

/xyz/display_portfolio.php?page=1

But when i try the next page for the same query which is:

/xyz/display_portfolio.php?page=2

i lose the category part and and results are showed without any category.

But if i try writing manually:

/xyz/display_portfolio.php?page=1&category='logo' (wrote &category='logo' manually)

I get the correct results, can anyone tell me how i can solve this problem?

Here is my pagination class:

<?php

// Author: Ayub Zafar, 2009
// Paginates result set according to max limit and generates links

require_once("connection.php");

class pagination{

protected $_query;
protected $_max_results;
protected $_page_number;
protected $_last_page;

public function __construct($query, $max_results){
$this->_query = $query;
$this->_max_results = $max_results;

if(isset($_GET['page'])){
$this->_page_number = (int)$_GET['page'];
}else{
$this->_page_number = 1;
}
}
public function generate_result_set(){ // generates result set

$pagination = new connection($this->_query);
$paginationResultSet = $pagination->getResultset();
$query_rows = mysql_num_rows($paginationResultSet);
$last_page = ceil($query_rows/$this->_max_results);
$this->_last_page = $last_page; // last_page initialized

if ($this->_page_number < 1)
{
$this->_page_number = 1;
}
elseif ($this->_page_number > $last_page)
{
$this->_page_number = $last_page;
}
$max = ' LIMIT '.($this->_page_number - 1)*$this->_max_results.', '.$this->_max_results;
$this->_query .= $max;
$paginated = new connection($this->_query);
$paginatedResultSet = $paginated->getResultset();
return $paginatedResultSet;
}

public function generate_links(){
echo "<br/>";
echo "Displaying Page <b>$this->_page_number</b> of <b>$this->_last_page</b>";
echo "<br/><br/>";
$previous = $this->_page_number - 1;
$next = $this->_page_number + 1;
if ($this->_page_number == 1)
{
echo "START";
echo " ¦ ";
echo "PREV";
echo " ¦ ";
echo "<a href='{$_SERVER['PHP_SELF']}?page=$next'>NEXT</a>";
echo " ¦ ";
echo "<a href='{$_SERVER['PHP_SELF']}?page=$this->_last_page'>LAST</a>";

}
elseif($this->_page_number > 1 && $this->_page_number != $this->_last_page){
echo "<a href='{$_SERVER['PHP_SELF']}?page=1'>START</a>";
echo " ¦ ";
echo "<a href='{$_SERVER['PHP_SELF']}?page=$previous'>PREV</a>";
echo " ¦ ";
echo "<a href='{$_SERVER['PHP_SELF']}?page=$next'>NEXT</a>";
echo " ¦ ";
echo "<a href='{$_SERVER['PHP_SELF']}?page=$this->_last_page'>LAST</a>";
}
elseif($this->_page_number == $this->_last_page){
echo "<a href='{$_SERVER['PHP_SELF']}?page=1'>START</a>";
echo " ¦ ";
echo "<a href='{$_SERVER['PHP_SELF']}?page=$previous'>PREV</a>";
echo " ¦ ";
echo "NEXT";
echo " ¦ ";
echo "LAST";
}
}
}

[penders]

Where are you reading and processing your category?

You need to record the state of your 'category' between page refreshes, a few ideas...

- Pass your category to your pagination class and incorporate this into your 'next', 'prev' anchors etc.

- Save the category in a cookie / session and read this when you build your query.

- Don't use anchors for your 'next', 'prev' links, but have these as submit buttons in a form. Make the category a hidden field in the form, so that it is passed back as well.

[ayub_zar]

right, but passing category to pagination class will make it specific for certain values/variables (e.g: every now and then i would have to write anchors for a new $_GET variable)..

If you could give session code example for the same problem that would be great.

OR

Is there any way i can append $_GET variables from previous page to next one by retrieving its name and value? (i don't know PHP functions that can do it) What i am trying is not to hard code specific $_GET variables into my pagination class, which kills the whole purpose of class itself.

Many thanks in advance,
Ayub