Probleme pagination

Bonjour,

J'utilise un script de pagination qui marche bien sur la page index.php où je select tout les articles de ma base de données mais il (le meme code) ne fonctionne pas sur la pages categories.php où je select les articles par catégories.

voici le code:

<?php
// Adam's Custom PHP MySQL Pagination Tutorial and Script
// You have to put your mysql connection data and alter the SQL queries(both queries)
// This script is in tutorial form and is accompanied by the following video:
// https://www.youtube.com/watch?v=K8xYGnEOXYc
mysql_connect("Hôte","user","pas") or diesword (mysql_error());
mysql_select_db("mabdd") or die (mysql_error());
//////////////  QUERY THE MEMBER DATA INITIALLY LIKE YOU NORMALLY WOULD
$sql = mysql_query("SELECT id, article, auteur FROM table ORDER BY id DESC");
//////////////////////////////////// Adam's Pagination Logic ////////////////////////////////////////////////////////////////////////
$nr = mysql_num_rows($sql); // Get total of Num rows from the database query
if (isset($_GET['pn'])) { // Get pn from URL vars if it is present
    $pn = preg_replace('#[^0-9]#i', '', $_GET['pn']); // filter everything but numbers for security(new)
    //$pn = ereg_replace("[^0-9]", "", $_GET['pn']); // filter everything but numbers for security(deprecated)
} else { // If the pn URL variable is not present force it to be value of page number 1
    $pn = 1;
} 
//This is where we set how many database items to show on each page 
$itemsPerPage = 10; 
// Get the value of the last page in the pagination result set
$lastPage = ceil($nr / $itemsPerPage);
// Be sure URL variable $pn(page number) is no lower than page 1 and no higher than $lastpage
if ($pn < 1) { // If it is less than 1
    $pn = 1; // force if to be 1
} else if ($pn > $lastPage) { // if it is greater than $lastpage
    $pn = $lastPage; // force it to be $lastpage's value
} 
// This creates the numbers to click in between the next and back buttons
// This section is explained well in the video that accompanies this script
$centerPages = "";
$sub1 = $pn - 1;
$sub2 = $pn - 2;
$add1 = $pn + 1;
$add2 = $pn + 2;
if ($pn == 1) {
    $centerPages .= '  <span class="pagNumActive">' . $pn . '</span>  ';
    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '">' . $add1 . '</a>  ';
} else if ($pn == $lastPage) {
    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '">' . $sub1 . '</a>  ';
    $centerPages .= '  <span class="pagNumActive">' . $pn . '</span>  ';
} else if ($pn > 2 && $pn < ($lastPage - 1)) {
    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub2 . '">' . $sub2 . '</a>  ';
    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '">' . $sub1 . '</a>  ';
    $centerPages .= '  <span class="pagNumActive">' . $pn . '</span>  ';
    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '">' . $add1 . '</a>  ';
    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add2 . '">' . $add2 . '</a>  ';
} else if ($pn > 1 && $pn < $lastPage) {
    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '">' . $sub1 . '</a>  ';
    $centerPages .= '  <span class="pagNumActive">' . $pn . '</span>  ';
    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '">' . $add1 . '</a>  ';
}
// This line sets the "LIMIT" range... the 2 values we place to choose a range of rows from database in our query
$limit = 'LIMIT ' .($pn - 1) * $itemsPerPage .',' .$itemsPerPage; 
// Now we are going to run the same query as above but this time add $limit onto the end of the SQL syntax
// $sql2 is what we will use to fuel our while loop statement below
$sql2 = mysql_query("SELECT id, article, auteur FROM toto ORDER BY id DESC $limit"); 
//////////////////////////////// END Adam's Pagination Logic ////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////// Adam's Pagination Display Setup /////////////////////////////////////////////////////////////////////
$paginationDisplay = ""; // Initialize the pagination output variable
// This code runs only if the last page variable is ot equal to 1, if it is only 1 page we require no paginated links to display
if ($lastPage != "1"){
    // This shows the user what page they are on, and the total number of pages
    
    // If we are not on page 1 we can place the Back button
    if ($pn != 1) {
        $previous = $pn - 1;
        $paginationDisplay .=  '   <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $previous . '" style="color:black;font-weight:bold;"><img src="back.gif"></a> ';
    } 
    // Lay in the clickable numbers display here between the Back and Next links
    $paginationDisplay .= '<span class="paginationNumbers">' . $centerPages . '</span>';
    // If we are not on the very last page we can place the Next button
    if ($pn != $lastPage) {
        $nextPage = $pn + 1;
        $paginationDisplay .=  '   <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $nextPage . '" " style="color:black;font-weight:bold;"><img src="next.gif"></a> ';
    } 
}
///////////////////////////////////// END Adam's Pagination Display Setup ///////////////////////////////////////////////////////////////////////////
// Build the Output Section Here
$outputList = '';
while($row = mysql_fetch_array($sql2)){ 

    $id = $row["id"];
    $blague = $row["blague"];
    $auteur = $row["auteur"];

    $outputList .='' . $article. '<br /><br />Ajoutée par <span>' . $auteur . '</span> <br /><hr style="height: 2px; color: #000000; background-color: #000000; width:100%; border: none;">';
    
} // close while loop
?>

Pour la page categorie j'ai juste changé la requete en:

$sql = mysql_query("SELECT id, article, auteur FROM table WHERE categorie='$categorie' ORDER BY id DESC");

$sql2 = mysql_query("SELECT id, article, auteur FROM table WHERE categorie='$categorie' ORDER BY id DESC $limit");

Mais malheureusement ça fonctionne pas pour categorie.php

une petite aide sera la bienvenue

Merci