Mine

$req = 'select * from `'.$psql.'sonde_data` WHERE id="'.$s_name.'" AND boot="'.$boot.'" order by `cpt` DESC LIMIT '.$cpt2.',1';$req = mysql_query($req, $connexion);while($data_sonde = mysql_fetch_object($req));      {               /*                * taille graph = 400                * début graphe = 31                * fin graphe   = 431                 */                $val = (197-($data_sonde->valeur*2));                imagesetpixel($im, $cpt, $val, $couleur[5]);                $cpt--;                $cpt2++;       }