微信/易信公共平台开发（四）：公众号调试器 (仿真微信平台,提供PHP源码)
开发微信/易信公共平台时，调试往往很麻烦，一般只能在手机上边试边改, 或在服务器写日志。当你的服务器脚本有Bug时，手机上没有显示，追查是不容易的。我在开发过程中，编写了一个调试器， 能仿真微信/易信平台，对公众号URL进行访问并显示详细响应数据，调试公众号变得很容易了。特分享给大家。
调试器地址：http://www.jostudio.org/emulator.php
界面如下： 输入公众号URL，发送文本消息，可显示出响应数据。边开发，边调试。
调试器可以发送文字信息，输入文字内容，按“发送文字消息”键即可。
调试器也可以仿真菜单点击, 输入菜单EventKey值，按“点击菜单”键即可。
调试器还可以仿真用户关注，按“从头开始”键，此时调试器将发送一个subscribe消息到公众号URL。
如果公众号URL响应过程中有错误发生，也会在返回数据显示中出来的， 调试很好用！
注：调试器向公众号URL发送消息时，发送者的openid 是 "emulator_user"
神秘功能： 这个调试器可以访问任何URL，就像web代理一样，比如：下图显示访问 www.baidu.com ， 点击“从头开始”， 则可以看到返回数据。
为什么返回数据的中文是乱码呢? 这是因为baidu.com返回的是gbk编码的汉字，而调试器遵循微信平台规则，使用的是utf-8编码的汉字. 请勾选 “返回数据是GBK编码” 的选项，点击“从头开始”再次提交，则返回结果中文就不乱码了。
勾选 “返回数据是GBK编码”，点击“从头开始”再次访问www.baidu.com, 结果显示“网页不存在”. 为什么呢？这是因为，调试器遵循微信平台规则, 在URL后自动加上了签名值, 且以POST方式访问URL，所以百度认为这个URL不存在。
勾选 “以GET方式访问URL” 的选项, 并且不要勾选 “返回数据是GBK编码”, 点击“从头开始”再次访问www.baidu.com，这一次正常了。
PS：百度首页是utf-8编码， 出错页面却是gbk编码
注意：以上过程是访问其它网站的实验，在实际调试公众号URL时，不要勾选 “以GET方式访问URL” 和 “返回数据是GBK编码” 的选项
嘿嘿，再神一点，访问一下www.facebook.com 给你看看， 网页一会儿就出来了，都说可以访问任何URL罗，是不是？ 难道这是翻墙了？！嗯，对头！
（不过，不好意思，调试器只是读取并显示了一下网页，并没有完成web代理的各项功能，所以是不能登录facebook的）
对调试器源码感兴趣的童鞋， 可在我的资源中下载: 调试器源码下载
源码只有一个文件 emulator.php ， 可以装在自己的服务器上
不解释，看源码注释吧
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