How to use Jpgraph to draw complex X-Y coordinate graphs in php, jpgraphx-y_PHP tutorial

<&#63;php 
include ("src/jpgraph.php"); 
include ("src/jpgraph_line.php"); 
$data1 = array(19,23,34,38,45,67,71,78,85,87,90,96); //第一条曲线的数组 
$data2 = array(523,634,371,278,685,587,490,256,398,545,367,577); //第二条曲线的数组 
$graph = new Graph(400,300); //创建新的Graph对象 
$graph->SetScale("textlin"); 
$graph->SetY2Scale("lin"); 
$graph->SetShadow(); //设置图像的阴影样式 
$graph->img->SetMargin(40,50,20,70); //设置图像边距 
$graph->title->Set("年度收支表"); //设置图像标题 
$lineplot1=new LinePlot($data1); //创建设置两条曲线对象 
$lineplot2=new LinePlot($data2); 
$graph->Add($lineplot1); //将曲线放置到图像上 
$graph->AddY2($lineplot2); 
$graph->xaxis->title->Set("月份"); //设置坐标轴名称 
$graph->yaxis->title->Set("兆美元"); 
$graph->y2axis->title->Set("兆美元"); 
$graph->title->SetFont(FF_SIMSUN,FS_BOLD); //设置字体 
$graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD); 
$graph->y2axis->title->SetFont(FF_SIMSUN,FS_BOLD); 
$graph->xaxis->title->SetFont(FF_SIMSUN,FS_BOLD); 
$lineplot1->SetColor("red"); //设置颜色 
$lineplot2->SetColor("blue"); 
$lineplot1->SetLegend("Cost Amount"); //设置图例名称 
$lineplot2->SetLegend("Revenue Amount"); 
$graph->legend->SetLayout(LEGEND_HOR); //设置图例样式和位置 
$graph->legend->Pos(0.4,0.95,"center","bottom"); 
$graph->Stroke(); //输出图像 
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