Alors voici mon code qui marche, et qui m'affiche un graphique avec des lignes de statistiques (http://vassili.org/blog/graph.php).
beaucoup de répétitions mais si ça peut t'aider à voir ce qui ne vas pas dans le tien.
<?php
require_once("JpGraph/jpgraph.php");
require_once("JpGraph/jpgraph_line.php");
$jour=date("Y-m-d");
$dveille1 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-1, date('Y')));
$dveille2 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-2, date('Y')));
$dveille3 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-3, date('Y')));
$dveille4= strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-4, date('Y')));
$dveille5 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-5, date('Y')));
$dveille6 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-6, date('Y')));
$dveille7 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-7, date('Y')));
$dveille8 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-8, date('Y')));
$dveille9 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-9, date('Y')));
$dveille10 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-10, date('Y')));
$dveille11 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-11, date('Y')));
$dveille12 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-12, date('Y')));
$dveille13 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-13, date('Y')));
$dveille14 = strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-14, date('Y')));
$dveille15= strftime("%Y-%m-%d", mktime(0, 0, 0, date('m'), date('d')-15, date('Y')));
$localip='192.168.1.1';
$localip2='192.168.1.11';
mysql_connect("hôte", "utilisateur", "motdepasse") or die("erreur de connexion");
mysql_select_db("base") or die("erreur de selection de base");
$reponse = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$jour' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse1 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille1' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse2 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille2' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse3 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille3' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse4 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille4' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse5 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille5' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse6 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille6' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse7 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille7' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse8 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille8' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse9 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille9' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse10 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille10' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse11 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille11' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse12 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille12' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse13 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille13' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse14 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille14' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$reponse15 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille15' AND ip NOT LIKE '$localip' AND ip NOT LIKE '$localip2'") or die("erreur de selection des donnees");
$donnees = mysql_fetch_row($reponse);
$donnees1 = mysql_fetch_row($reponse1);
$donnees2 = mysql_fetch_row($reponse2);
$donnees3 = mysql_fetch_row($reponse3);
$donnees4 = mysql_fetch_row($reponse4);
$donnees5 = mysql_fetch_row($reponse5);
$donnees6 = mysql_fetch_row($reponse6);
$donnees7 = mysql_fetch_row($reponse7);
$donnees8 = mysql_fetch_row($reponse8);
$donnees9 = mysql_fetch_row($reponse9);
$donnees10 = mysql_fetch_row($reponse10);
$donnees11 = mysql_fetch_row($reponse11);
$donnees12 = mysql_fetch_row($reponse12);
$donnees13 = mysql_fetch_row($reponse13);
$donnees14 = mysql_fetch_row($reponse14);
$donnees15 = mysql_fetch_row($reponse15);
$nb = $donnees[0];//nombre d'entrées trouvées
$nb1 = $donnees1[0];
$nb2 = $donnees2[0];
$nb3 = $donnees3[0];
$nb4 = $donnees4[0];
$nb5 = $donnees5[0];
$nb6 = $donnees6[0];
$nb7 = $donnees7[0];
$nb8 = $donnees8[0];
$nb9 = $donnees9[0];
$nb10 = $donnees10[0];
$nb11 = $donnees11[0];
$nb12 = $donnees12[0];
$nb13 = $donnees13[0];
$nb14 = $donnees14[0];
$nb15 = $donnees15[0];
$reponselocal = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$jour' AND ip LIKE '$localip'") or die("erreur de selection des donnees");
$reponselocal1 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille1' AND ip LIKE '$localip'") or die("erreur de selection des donnees");
$reponselocal2 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille2' AND ip LIKE '$localip'") or die("erreur de selection des donnees");
$reponselocal3 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille3' AND ip LIKE '$localip'") or die("erreur de selection des donnees");
$reponselocal4 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille4' AND ip LIKE '$localip'") or die("erreur de selection des donnees");
$reponselocal5 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille5' AND ip LIKE '$localip'") or die("erreur de selection des donnees");
$reponselocal6 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille6' AND ip LIKE '$localip'") or die("erreur de selection des donnees");
$donneeslocal = mysql_fetch_row($reponselocal);
$donneeslocal1 = mysql_fetch_row($reponselocal1);
$donneeslocal2 = mysql_fetch_row($reponselocal2);
$donneeslocal3 = mysql_fetch_row($reponselocal3);
$donneeslocal4 = mysql_fetch_row($reponselocal4);
$donneeslocal5 = mysql_fetch_row($reponselocal5);
$donneeslocal6 = mysql_fetch_row($reponselocal6);
$nblocal = $donneeslocal[0];//nombre d'entrées trouvées
$nblocal1 = $donneeslocal1[0];
$nblocal2 = $donneeslocal2[0];
$nblocal3 = $donneeslocal3[0];
$nblocal4 = $donneeslocal4[0];
$nblocal5 = $donneeslocal5[0];
$nblocal6 = $donneeslocal6[0];
$reponsevareu = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$jour' AND ip LIKE '78.239.41.242'") or die("erreur de selection des donnees");
$reponsevareu1 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille1' AND ip LIKE '78.239.41.242'") or die("erreur de selection des donnees");
$reponsevareu2 = mysql_query("SELECT COUNT(*) FROM stats WHERE jour LIKE '$dveille2' AND ip LIKE '78.239.41.242'") or die("erreur de selection des donnees");
$donneesvareu = mysql_fetch_row($reponsevareu);
$donneesvareu1 = mysql_fetch_row($reponsevareu1);
$donneesvareu2 = mysql_fetch_row($reponsevareu2);
$nbV = $donneesvareu[0];//nombre d'entrées trouvées
$nbV1 = $donneesvareu1[0];
$nbV2 = $donneesvareu2[0];
mysql_close();
$tableau = array($nb, $nb1, $nb2, $nb3, $nb4, $nb5, $nb6, $nb7, $nb8, $nb9, $nb10, $nb11, $nb12, $nb13, $nb14, $nb15);
$tableau2 = array($nblocal, $nblocal1, $nblocal2, $nblocal3 ,$nblocal4 ,$nblocal5 ,$nblocal6);
$tableau3=array($nbV, $nbV1, $nbV2);
$largeur = 1200;
$hauteur = 500;
// Initialisation du graphique
$graphe = new Graph($largeur, $hauteur);
// Echelle lineaire ('lin') en ordonnee et pas de valeur en abscisse ('text')
// Valeurs min et max seront determinees automatiquement
$graphe->setScale("textlin");
// Creation de la courbe
$courbe1 = new LinePlot($tableau);
$courbe2 = new LinePlot($tableau2);
$courbe3 = new LinePlot($tableau3);
// Ajout de la courbe au graphique
$graphe->add($courbe1);
$graphe->add($courbe2);
$graphe->add($courbe3);
// Ajout du titre du graphique
$graphe->title->set("Nombre d'affichages du blog, par jour, sur les seize derniers jours");
// Affichage du graphique
$graphe->stroke();
?>