Jpgraph是PHP圖表類庫，可以生成折線圖、柱狀圖、大餅圖等等統計圖。如果你想使用PHP生成統計圖來統計數據，使用它再方便不過啦。

如果說你要親自使用GD庫來寫的話，那我只能膜拜大神啦（我不會哈哈哈）。

言歸正傳，首先你要確定你的PHP已經開啟GD庫啦，在php.ini配置文件中找到extension=php_gd2.dll確認沒有被;註釋。那表示已經開啟GD庫拉。

然後就可以去網上下一個Jpgraph的壓縮包啦。解壓保存到一個任意文件夾，之後會引用其中的文件，所以最好保存到一個你熟悉的文件夾。

1）生成折線圖

<?php  

require_once ("jpgraph/src/jpgraph.php");  
 
require_once ("jpgraph/src/jpgraph_line.php");  
   
$data1 = array(523,634,371,278,685,587,490,256,398,545,367,577); //第一條曲線的數組  
   
$graph = new Graph(500,300);   
$graph->SetScale("textlin");  
$graph->SetShadow();     
$graph->img->SetMargin(60,30,30,70); //設置圖像邊距  
   
$graph->graph_theme = null
 
; //設置主題為null，否則value->Show(); 無效  
   
$lineplot1=new LinePlot($data1); //創建設置兩條曲線對象  
$lineplot1->value->SetColor("red");  
$lineplot1->value->Show();  
$graph->Add($lineplot1);  //將曲線放置到圖像上  
   
$graph->title->Set(iconv("UTF-8","GB2312//IGNORE","網誌博客信息統計表"));   //設置圖像標題  
$graph->xaxis->title->Set(iconv
 
("UTF-8","GB2312//IGNORE","月份")); //設置坐標軸名稱  
$graph->yaxis->title->Set(iconv("UTF-8","GB2312//IGNORE","流量"));  
$graph->title->SetMargin(10);  
$graph->xaxis->title->SetMargin(10);  
$graph->yaxis->title->SetMargin(10);  
   
$graph->title->SetFont(FF_SIMSUN,FS_BOLD); //設置字體  
$graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);  
$graph->xaxis->title->SetFont(FF_SIMSUN,FS_BOLD);   
$graph->xaxis->SetTickLabels($gDateLocale->GetShortMonth());  
  
$graph->Stroke();  //輸出圖像  

效果如圖

2）柱狀圖

<?php  
require_once ("jpgraph/jpgraph.php");  
require_once ("jpgraph/jpgraph_bar.php");  
  
$data  = array(19,23,34,38,45,67,71,78,85,87,96,145);           
$ydata = array("一","二","三","四","五","六","七","八","九","十","十一","十二");  
  
$graph = new Graph(500,300);  //創建新的Graph對象  
$graph->SetScale("textlin");  //刻度樣式  
$graph->SetShadow();          //設置陰影  
$graph->img->SetMargin(40,30,40,50); //設置邊距  
  
$graph->graph_theme = null; //設置主題為null，否則value->Show(); 無效  
  
$barplot = new BarPlot($data);  //創建BarPlot對象  
$barplot->SetFillColor(‘blue‘); //設置顏色  
$barplot->value->Show(); //設置顯示數字  
$graph->Add($barplot);  //將柱形圖添加到圖像中  
   
$graph->title->Set("CDN流量圖");   
$graph->xaxis->title->Set("月份"); //設置標題和X-Y軸標題  
$graph->yaxis->title->Set("流 量(Mbits)");                                                                        
$graph->title->SetColor("red");  
$graph->title->SetMargin(10);  
$graph->xaxis->title->SetMargin(5);  
$graph->xaxis->SetTickLabels($ydata);  
   
$graph->title->SetFont(FF_SIMSUN,FS_BOLD);  //設置字體  
$graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);  
$graph->xaxis->title->SetFont(FF_SIMSUN,FS_BOLD);  
$graph->xaxis->SetFont(FF_SIMSUN,FS_BOLD);  
  
$graph->Stroke();  

效果如圖

3）大餅圖

require_once ("jpgraph/src/jpgraph.php");  
require_once ("jpgraph/src/jpgraph_pie.php");  
require_once ("jpgraph/src/jpgraph_pie3d.php");  
   
$data = array(19,23,34,38,45,67,71,78,85,87,90,96);  
   
$graph = new PieGraph(550,500);  
$graph->SetShadow();  
   
$graph->title->Set("CDN流量比例");  
$graph->title->SetFont(FF_SIMSUN,FS_BOLD);  
   
$pieplot = new PiePlot3D($data);  //創建PiePlot3D對象  
$pieplot->SetCenter(0.4, 0.5); //設置餅圖中心的位置  
$pieplot->SetLegends($gDateLocale->GetShortMonth()); //設置圖例  
  
$graph->Add($pieplot);  
$graph->Stroke();  

效果如圖

不知道各位看官發現沒有，貌似柱狀圖和大餅圖的文字不是正常的中文。折線圖倒是正確的，這是因為Jpgraph默認把字符串轉換為UTF8格式的，如果你的文件php文件本身就是UTF8格式那麽久相當於轉換了2次，所以產生了亂碼。

這裏就要用到轉換編碼方式 iconv("UTF-8","gb2312",$x);需要先把漢字編碼轉化為gb2312，這樣漢字才能正常顯示。參考第一段代碼寫法就行。

下面附上更詳細的介紹博客地址（感謝技術分享）：http://blog.csdn.net/aoshilang2249/article/details/46956163

&& http://w3note.com/web/181.html && http://blog.csdn.net/liupengcheng201/article/details/44593713

PHP中使用Jpgraph生成統計圖