pChart是一个开源的图表生成库，主要涉及3个Class：pChart.class, pData.class, pCache.class，可生成20多种简单或复杂的图表，支持PNG，JPG，GIF通用图片格式。数据源可以来自于Database，CSV，当然也可以手写。使用该程序PHP需要开启GD服务，先来看看pChart的工作流程：

主要分为三步：

1. * 读取用于生成图表数据（数据库、文件）
2. * 设计图表样式（圆角、底色等）
3. * 制作标签、题目、图例并生成图表

下面看一个简单的柱状图表：

代码如下：

<?php

 // Standard inclusions

 include("pChart/pData.class");

 include("pChart/pChart.class");

 // Dataset definition

 $DataSet = new pData;

 //图表数据

 $DataSet->AddPoint(array(1,4,-3,2,-3,3,2,1,0,7,4),"Serie1");

 $DataSet->AddPoint(array(3,3,-4,1,-2,2,1,0,-1,6,3),"Serie2");

 $DataSet->AddPoint(array(4,1,2,-1,-4,-2,3,2,1,2,2),"Serie3");

 $DataSet->AddAllSeries();

 $DataSet->SetAbsciseLabelSerie();

 //数据图例

 $DataSet->SetSerieName("Microsoft","Serie1");

 $DataSet->SetSerieName("IBM","Serie2");

 $DataSet->SetSerieName("Google","Serie3");

 // Initialise the graph

 $Test = new pChart(700,230);

 //设置图表尺寸、样式

 $Test->setFontProperties("Fonts/tahoma.ttf",8);

 $Test->setGraphArea(50,30,680,200);

 $Test->drawFilledRoundedRectangle(7,7,693,223,5,240,240,240);

 $Test->drawRoundedRectangle(5,5,695,225,5,230,230,230);

 $Test->drawGraphArea(255,255,255,TRUE);

 $Test->drawScale($DataSet->GetData(),$DataSet->GetDataDescription(),SCALE_NORMAL,150,150,150,TRUE,0,2,TRUE);

 $Test->drawGrid(4,TRUE,230,230,230,50);

 // Draw the 0 line

 $Test->setFontProperties("Fonts/MankSans.ttf",6);

 $Test->drawTreshold(0,143,55,72,TRUE,TRUE);

 // Draw the bar graph

 //柱状图要使用drawBarGraph()

 $Test->drawBarGraph($DataSet->GetData(),$DataSet->GetDataDescription(),TRUE,80);

 // Finish the graph

 //制作图例、标题、字体等属性

 $Test->setFontProperties("Fonts/MankSans.ttf",10);

 $Test->drawLegend(596,150,$DataSet->GetDataDescription(),255,255,255);

 $Test->setFontProperties("Fonts/MankSans.ttf",10);

 $Test->drawTitle(50,22,"Example",50,50,50,585);

 //生成图表

 $imageFile = "example12.png";

 $Test->Render($imageFile);

 echo '<img src="'.$imageFile.'">';

?>

这个是雷达效果的：

代码：

<?php

 // Standard inclusions

 include("pChart/pData.class");

 include("pChart/pChart.class");

 // Dataset definition

 $DataSet = new pData;

 $DataSet->AddPoint(array("Memory","Disk","Network","Slots","CPU"),"Label");

 $DataSet->AddPoint(array(6,4,7,4,5),"Serie1");

 $DataSet->AddPoint(array(2,3,5,2,4),"Serie2");

 $DataSet->AddSerie("Serie1");

 $DataSet->AddSerie("Serie2");

 $DataSet->SetAbsciseLabelSerie("Label");

 $DataSet->SetSerieName("Reference","Serie1");

 $DataSet->SetSerieName("Tested computer","Serie2");

 // Initialise the graph

 $Test = new pChart(400,400);

 $Test->setFontProperties("Fonts/tahoma.ttf",8);

 $Test->drawFilledRoundedRectangle(7,7,393,393,5,240,240,240);

 $Test->drawRoundedRectangle(5,5,395,395,5,230,230,230);

 $Test->setGraphArea(30,30,370,370);

 $Test->drawFilledRoundedRectangle(30,30,370,370,5,255,255,255);

 $Test->drawRoundedRectangle(30,30,370,370,5,220,220,220);

 // Draw the radar graph

 //要使用drawRadarAxis()生成雷达效果

 $Test->drawRadarAxis($DataSet->GetData(),$DataSet->GetDataDescription(),TRUE,20,120,120,120,230,230,230);

 $Test->drawFilledRadar($DataSet->GetData(),$DataSet->GetDataDescription(),50,20);

 // Finish the graph

 $Test->drawLegend(15,15,$DataSet->GetDataDescription(),255,255,255);

 $Test->setFontProperties("Fonts/tahoma.ttf",10);

 $Test->drawTitle(0,22,"Example",50,50,50,400);

 $imageFile = "example8.png";

 $Test->Render($imageFile);

 echo '<img src="'.$imageFile.'">';

?>

再看几个其他的效果 
1，饼图：

2, 双座标曲线图：

3, 层叠柱状图：

4, 多图表：

图表的种类已经相当丰富了，具体图表设置请参考
http://pchart.sourceforge.net/documentation.php?topic=pChart 
::源代码下载::