我们常有的一般都是百度的echart，将数据输出到js里面在渲染出条形图。但是有时候不想把数据输出来，或在项目中不方便使用js情况下！用GD去生成统计图是一个不错的选择！
主要使用https://jpgraph.net项目。
下载地址：https://jpgraph.net/download/
包含条形图、饼状图、树状图、等等https://jpgraph.net/features/gallery.php#line1
在线示例：https://jpgraph.net/features/src/show-example.php?target=new_line1.php
使用示例：https://www.toolnb.com/tools/githubStarRanking.html
生成条形图：https://www.toolnb.com/Tools/Api/getGithubHistoryImg.html?guid=801421f6-34fc-09ef-2655-f4a3093440c2
代码：
require_once('./jpgraph-4.2.6/src/jpgraph.php');
require_once('./jpgraph-4.2.6/src/jpgraph_line.php');
$datay1 = [2,3,4,5,6];
$graph = new \Graph(260, 180);
$graph->SetScale("textlin");
$theme_class = new \UniversalTheme;
$graph->SetTheme($theme_class);
$graph->img->SetAntiAliasing(false);
$graph->title->Set('Project Star History');
$graph->SetBox(false);
$graph->SetMargin(60, 20, 36, 63);
$graph->img->SetAntiAliasing();
$graph->yaxis->HideZeroLabel();
$graph->yaxis->HideLine(false);
$graph->yaxis->HideTicks(false, false);
$graph->xgrid->Show();
$graph->xgrid->SetLineStyle("solid");
$graph->xaxis->SetTickLabels([1,2,3,4,5]);
$graph->xgrid->SetColor('#E3E3E3');
$p1 = new \LinePlot($datay1);
$graph->Add($p1);
$p1->SetColor("#6495ED");
$p1->SetLegend('Star History');
$graph->legend->SetFrameWeight(1);
$graph->Stroke();参考：https://blog.csdn.net/aoshilang2249/article/details/46956163
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