Programmation php

<?php
require_once ('C:\Program Files\EasyPHP-DevServer-14.1VC11\data\localweb\local\src\jpgraph.php');
require_once ('C:\Program Files\EasyPHP-DevServer-14.1VC11\data\localweb\local\src\jpgraph_bar.php');
require_once ('C:\Program Files\EasyPHP-DevServer-14.1VC11\data\localweb\local\src\jpgraph_line.php');

session_start();
$m = $_SESSION['m1'];
$m2 = $_SESSION['m3'];
$m3 = $_SESSION['m4'];
$m4 = $_SESSION['m5'];
$m5 = $_SESSION['m6'];
$m6 = $_SESSION['m7'];
$m7 = $_SESSION['m8'];
$m8 = $_SESSION['m9'];
$m9 = $_SESSION['m10'];
$m10 = $_SESSION['m11'];
$m11 = $_SESSION['m12'] ;
 
header ("Content-type: image/png");  
// donnees des axes Y et X
$ydata = array($m, $m2, $m3, $m4, $m5, $m6, $m7, $m8, $m9, $m10, $m11);
$xdata = array('C1', 'C2', 'C3', 'C4', 'C5', 'C6','C7','C8','C9','C10','C11');
// creation du graphique
$graph = new Graph(count($ydata)*70, 400);
$graph->SetScale("textint");
// style
$graph->SetShadow();
$graph->SetColor('white');
$graph->SetMarginColor('gray6');
$graph->SetMargin(40, 30, 20, 40);// marge gauche, droite, haut, bas
// donner des titres et etiquettes
$graph->title->Set("Resultat audit organisationnel et physique");
$graph->yaxis->title->Set("moyenne");
$graph->xaxis->title->Set("chapitre");
$graph->xaxis->SetTickLabels($xdata);

// creation histogramme
$hist = new BarPlot($ydata);
$hist->SetWidth(0.6) ;
$hist->SetFillColor(array('#6A455D', '#FD3F92', '#D2CAEC','#00CCCB','#FC5D5D','#6600FF','#FF00FF','#FEE7F0','#048B9A','#DD985C','#25FDE9'));
$graph->legend->Pos(0.02,0.05);
$hist1 = new LinePlot($m);
$graph->Add($hist1);
$hist1->SetColor("#6A455D");
$hist1->SetLegend('chapitre1');
$hist2 = new LinePlot($m2);
$graph->Add($hist2);
$hist2->SetColor("#FD3F92");
$hist2->SetLegend('chapitre2');
$hist3 = new LinePlot($m3);
$graph->Add($hist3);
$hist3->SetColor("#D2CAEC");
$hist3->SetLegend('chapitre3');
$hist4 = new LinePlot($m4);
$graph->Add($hist4);
$hist4->SetColor("#00CCCB");
$hist4->SetLegend('chapitre4');
$hist5 = new LinePlot($m5);
$graph->Add($hist5);
$hist5->SetColor("#FC5D5D");
$hist5->SetLegend('chapitre5');

$graph->Add($hist);


// envoi image au format PNG
$graph->img->SetImgFormat("png"); // formats autorises : png, gif, jpg
$graph->Stroke();
?>