Avant dernier

<?php
mysql_select_db($bdd);
$req_avant_dernier = "SELECT * FROM articles LIMIT 1,3";
$req_avant_dernier_exec = mysql_query($req_avant_dernier);
$avant_dernier = mysql_fetch_assoc($req_avant_dernier_exec);
?>

<?php
mysql_select_db($bdd);
$req_avant_dernier = "SELECT * FROM articles LIMIT 2,2";
$req_avant_dernier_exec = mysql_query($req_avant_dernier);
$avant_dernier = mysql_fetch_assoc($req_avant_dernier_exec);
?>

<?php
mysql_select_db($bdd);
$req_avant_dernier = "SELECT * FROM articles ORDER BY id_article LIMIT 2,2";
$req_avant_dernier_exec = mysql_query($req_avant_dernier);
$avant_dernier = mysql_fetch_assoc($req_avant_dernier_exec);
?>

<?php
mysql_select_db($bdd);
$req_avant_avant_dernier = "select * from articles ORDER BY id_article DESC LIMIT 2,1 ";
$req_avant_avant_dernier_exec = mysql_query($req_avant_avant_dernier);
$avant_avant_dernier = mysql_fetch_assoc($req_avant_avant_dernier_exec);
?>

<?php
mysql_select_db($bdd);
$req = "SELECT * FROM articles ORDER BY id_articles DESC LIMIT ???????";
$req_exec = mysql_query($req);
?>


<?php  while ($resultat = mysql_fetch_assoc($req_exec) { ?>

<?php echo $resultat['titre'] . '<br>' ;?>

<?php } ?>