JpGraph使用详解
微信平台开发的推广支持应用里，为了满足用户渠道推广分析的需要，公众平台提供了生成带参数二维码的接口。使用该接口可以获得多个带不同场景值的二维码，用户扫描后，公众号可以接收到事件推送，借此可以通过统计不同场景扫描的二维码的结果来获取商业信息。
为了更形象地展示统计结果，可以使用php作图，不过这需要掌握复杂抽象的画图函数，这里推荐使用php的JpGraph图表类库，它使得作图变成了一件非常简单的事情，你只需从数据库中取出相关数据，定义标题，图表类型，然后的事情就交给JpGraph，只需掌握为数不多的JpGraph内置函数（可以参照JpGraph附带例子学习），就可以画出非常炫目的图表！
因为我最近也在做phpcmw微信插件用户信息统计这块，所以对JpGraph作了一番研究应用。为避免初学者走我走过的弯路，我把调试记录整 理出来，分享给大家。
通过本文你至少可以掌握以下技巧：
1、能够使用JpGraph画出各式各样的图表
2、解决中文乱码
一、开启GD库
Jpgraph需要GD库的支持，所以在调式JpGraph之前，确保GD库已开启，这很重要，不然后面的工作就没办法展开了。GD库在PHP5中是被默认安装的，我们只需开启GD库就可以了。
打开php.ini文件，找到“;extension=php
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