微信订阅号开发之token验证后，自动回复消息功能做好，发送消息没有返回
相信很多人会跟我一样，token验证之后，发送消息给订阅号，没有消息返回。
以下，说一下我辛苦调试得到的解决办法：
首先，token验证：
自己写的token一直验证失败，找了好久，没有发现bug。实在没办法，就用了官方的示例代码。并且通过示例代码调试，发现了一个让我吐血的bug（也不算bug）：
token验证貌似要求字符编码格式！！！！
官方的示例代码，直接上传到服务器，token直接过！
把官方示例代码改为UTF-8格式，再上传覆盖，token失败！失败！失败！
后来，把自己写的修改为ANSI格式还是token失败！醉了醉了！那只好用官方示例代码。在此，说下，token是一次握手验证，验证过一次就不用了。
下面，言归正传，貌似偏题了...orz
token验证之后，直接用官方示例代码，赶紧测试自己的订阅号，结果....发出去的消息就跟泼出去的水一样，什么鬼都没有返回...orz
又各种找bug，各种群问，各种搜索....历经本博主九九八十一的努力，终于找出了问题所在（这里是指我自己开发的，并不包括全部，如果你有不同的bug，欢迎交流）：
1、最容易被忽视的一个bug，官方给的示例代码，压根就没调用写好的那个responseMsg()函数！
2、把之前的token代码注释，也就是$wechatObj->valid();这行代码。因为toke验证那段代码会有一个echo $echostr，会把responseMsg()函数里的echo $resultStr;（56行）xml格式混乱，输回给微信服务器就无法识别了（貌似只能识别xml格式，还有json格式）。（token验证是一次握手验证，验证开发者之后，就可以不用了，赶紧让它消失在我们整洁的代码orz...）
3、最恶心的一个bug，还是字符编码问题！orz...xml要求UTF-8编码，所以，把示例代码改回UTF-8编码！这个bug找的让我崩溃！！！
下面是我修改后的代码，能正常运行，无bug，需要的可以参考一下
<span style="color: #008080;"> 1</span> <span style="color: #000000;">php</span><span style="color: #008080;"> 2</span> <span style="color: #008000;">/*</span><span style="color: #008000;">*</span><span style="color: #008080;"> 3</span> <span style="color: #008000;"> * wechat php test</span><span style="color: #008080;"> 4</span> <span style="color: #008000;">*/</span><span style="color: #008080;"> 5</span> <span style="color: #008080;"> 6</span> <span style="color: #008000;">//</span><span style="color: #008000;">define your token</span><span style="color: #008080;"> 7</span> <span style="color: #008080;">define</span>("TOKEN", "codcodog"<span style="color: #000000;">);</span><span style="color: #008080;"> 8</span> <span style="color: #008080;"> 9</span> <span style="color: #800080;">$wechatObj</span> = <span style="color: #0000ff;">new</span><span style="color: #000000;"> wechatCallbackapiTest();</span><span style="color: #008080;">10</span> <span style="color: #008000;">//</span><span style="color: #008000;">$wechatObj->valid();</span><span style="color: #008080;">11</span> <span style="color: #800080;">$wechatObj</span>-><span style="color: #000000;">responseMsg();</span><span style="color: #008080;">12</span> <span style="color: #008080;">13</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> wechatCallbackapiTest</span><span style="color: #008080;">14</span> <span style="color: #000000;">{</span><span style="color: #008080;">15</span> <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> valid()</span><span style="color: #008080;">16</span> <span style="color: #000000;"> {</span><span style="color: #008080;">17</span> <span style="color: #800080;">$echoStr</span> = <span style="color: #800080;">$_GET</span>["echostr"<span style="color: #000000;">];</span><span style="color: #008080;">18</span> <span style="color: #008080;">19</span> <span style="color: #008000;">//</span><span style="color: #008000;">valid signature , option</span><span style="color: #008080;">20</span> <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$this</span>-><span style="color: #000000;">checkSignature()){</span><span style="color: #008080;">21</span> <span style="color: #008080;">header</span>('content-type:text'<span style="color: #000000;">);</span><span style="color: #008080;">22</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$echoStr</span><span style="color: #000000;">;</span><span style="color: #008080;">23</span> <span style="color: #0000ff;">exit</span><span style="color: #000000;">;</span><span style="color: #008080;">24</span> <span style="color: #000000;"> }</span><span style="color: #008080;">25</span> <span style="color: #000000;"> }</span><span style="color: #008080;">26</span> <span style="color: #008080;">27</span> <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> responseMsg()</span><span style="color: #008080;">28</span> <span style="color: #000000;"> {</span><span style="color: #008080;">29</span> <span style="color: #008000;">//</span><span style="color: #008000;">get post data, May be due to the different environments</span><span style="color: #008080;">30</span> <span style="color: #800080;">$postStr</span> = <span style="color: #800080;">$GLOBALS</span>["HTTP_RAW_POST_DATA"<span style="color: #000000;">];</span><span style="color: #008080;">31</span> <span style="color: #008000;">//</span><span style="color: #008000;">$postStr = file_get_contents("php://input");</span><span style="color: #008080;">32</span> <span style="color: #008080;">file_put_contents</span>("log.txt",<span style="color: #800080;">$postStr</span>,<span style="color: #000000;">FILE_APPEND );</span><span style="color: #008080;">33</span> <span style="color: #008000;">//</span><span style="color: #008000;">extract post data</span><span style="color: #008080;">34</span> <span style="color: #0000ff;">if</span> (!<span style="color: #0000ff;">empty</span>(<span style="color: #800080;">$postStr</span><span style="color: #000000;">)){</span><span style="color: #008080;">35</span> <span style="color: #008000;">/*</span><span style="color: #008000;"> libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,</span><span style="color: #008080;">36</span> <span style="color: #008000;"> the best way is to check the validity of xml by yourself </span><span style="color: #008000;">*/</span><span style="color: #008080;">37</span> libxml_disable_entity_loader(<span style="color: #0000ff;">true</span><span style="color: #000000;">);</span><span style="color: #008080;">38</span> <span style="color: #800080;">$postObj</span> = <span style="color: #008080;">simplexml_load_string</span>(<span style="color: #800080;">$postStr</span>, 'SimpleXMLElement',<span style="color: #000000;"> LIBXML_NOCDATA);</span><span style="color: #008080;">39</span> <span style="color: #800080;">$fromUsername</span> = <span style="color: #800080;">$postObj</span>->FromUserName; <span style="color: #008000;">//</span><span style="color: #008000;">用户</span><span style="color: #008080;">40</span> <span style="color: #800080;">$toUsername</span> = <span style="color: #800080;">$postObj</span>->ToUserName; <span style="color: #008000;">//</span><span style="color: #008000;">公众平台</span><span style="color: #008080;">41</span> <span style="color: #800080;">$keyword</span> = <span style="color: #008080;">trim</span>(<span style="color: #800080;">$postObj</span>-><span style="color: #000000;">Content);</span><span style="color: #008080;">42</span> <span style="color: #800080;">$time</span> = <span style="color: #008080;">time</span><span style="color: #000000;">();</span><span style="color: #008080;">43</span> <span style="color: #800080;">$textTpl</span> = "<span style="color: #000000;"><xml></xml></span><span style="color: #008080;">44</span> <span style="color: #000000;"> <tousername></tousername></span><span style="color: #008080;">45</span> <span style="color: #000000;"> <fromusername></fromusername></span><span style="color: #008080;">46</span> <span style="color: #000000;"> <createtime>%s</createtime></span><span style="color: #008080;">47</span> <span style="color: #000000;"> <msgtype></msgtype></span><span style="color: #008080;">48</span> <span style="color: #000000;"> <content></content></span><span style="color: #008080;">49</span> <span style="color: #000000;"> <funcflag>0</funcflag></span><span style="color: #008080;">50</span> "<span style="color: #000000;">; </span><span style="color: #008080;">51</span> <span style="color: #0000ff;">if</span>(!<span style="color: #0000ff;">empty</span>( <span style="color: #800080;">$keyword</span><span style="color: #000000;"> ))</span><span style="color: #008080;">52</span> <span style="color: #000000;"> {</span><span style="color: #008080;">53</span> <span style="color: #800080;">$msgType</span> = "text"<span style="color: #000000;">;</span><span style="color: #008080;">54</span> <span style="color: #800080;">$contentStr</span> = "Welcome to wechat world!"<span style="color: #000000;">;</span><span style="color: #008080;">55</span> <span style="color: #800080;">$resultStr</span> = <span style="color: #008080;">sprintf</span>(<span style="color: #800080;">$textTpl</span>, <span style="color: #800080;">$fromUsername</span>, <span style="color: #800080;">$toUsername</span>, <span style="color: #800080;">$time</span>, <span style="color: #800080;">$msgType</span>, <span style="color: #800080;">$contentStr</span><span style="color: #000000;">);</span><span style="color: #008080;">56</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$resultStr</span><span style="color: #000000;">;</span><span style="color: #008080;">57</span> }<span style="color: #0000ff;">else</span><span style="color: #000000;">{</span><span style="color: #008080;">58</span> <span style="color: #0000ff;">echo</span> "Input something..."<span style="color: #000000;">;</span><span style="color: #008080;">59</span> <span style="color: #000000;"> }</span><span style="color: #008080;">60</span> <span style="color: #008080;">61</span> }<span style="color: #0000ff;">else</span><span style="color: #000000;"> {</span><span style="color: #008080;">62</span> <span style="color: #0000ff;">echo</span> ""<span style="color: #000000;">;</span><span style="color: #008080;">63</span> <span style="color: #0000ff;">exit</span><span style="color: #000000;">;</span><span style="color: #008080;">64</span> <span style="color: #000000;"> }</span><span style="color: #008080;">65</span> <span style="color: #000000;"> }</span><span style="color: #008080;">66</span> <span style="color: #008080;">67</span> <span style="color: #0000ff;">private</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> checkSignature()</span><span style="color: #008080;">68</span> <span style="color: #000000;"> {</span><span style="color: #008080;">69</span> <span style="color: #008000;">//</span><span style="color: #008000;"> you must define TOKEN by yourself</span><span style="color: #008080;">70</span> <span style="color: #0000ff;">if</span> (!<span style="color: #008080;">defined</span>("TOKEN"<span style="color: #000000;">)) {</span><span style="color: #008080;">71</span> <span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> <span style="color: #0000ff;">Exception</span>('TOKEN is not defined!'<span style="color: #000000;">);</span><span style="color: #008080;">72</span> <span style="color: #000000;"> }</span><span style="color: #008080;">73</span> <span style="color: #008080;">74</span> <span style="color: #800080;">$signature</span> = <span style="color: #800080;">$_GET</span>["signature"<span style="color: #000000;">];</span><span style="color: #008080;">75</span> <span style="color: #800080;">$timestamp</span> = <span style="color: #800080;">$_GET</span>["timestamp"<span style="color: #000000;">];</span><span style="color: #008080;">76</span> <span style="color: #800080;">$nonce</span> = <span style="color: #800080;">$_GET</span>["nonce"<span style="color: #000000;">];</span><span style="color: #008080;">77</span> <span style="color: #008080;">78</span> <span style="color: #800080;">$token</span> =<span style="color: #000000;"> TOKEN;</span><span style="color: #008080;">79</span> <span style="color: #800080;">$tmpArr</span> = <span style="color: #0000ff;">array</span>(<span style="color: #800080;">$token</span>, <span style="color: #800080;">$timestamp</span>, <span style="color: #800080;">$nonce</span><span style="color: #000000;">);</span><span style="color: #008080;">80</span> <span style="color: #008000;">//</span><span style="color: #008000;"> use SORT_STRING rule</span><span style="color: #008080;">81</span> <span style="color: #008080;">sort</span>(<span style="color: #800080;">$tmpArr</span>,<span style="color: #000000;"> SORT_STRING);</span><span style="color: #008080;">82</span> <span style="color: #800080;">$tmpStr</span> = <span style="color: #008080;">implode</span>( <span style="color: #800080;">$tmpArr</span><span style="color: #000000;"> );</span><span style="color: #008080;">83</span> <span style="color: #800080;">$tmpStr</span> = <span style="color: #008080;">sha1</span>( <span style="color: #800080;">$tmpStr</span><span style="color: #000000;"> );</span><span style="color: #008080;">84</span> <span style="color: #008080;">85</span> <span style="color: #0000ff;">if</span>( <span style="color: #800080;">$tmpStr</span> == <span style="color: #800080;">$signature</span><span style="color: #000000;"> ){</span><span style="color: #008080;">86</span> <span style="color: #0000ff;">return</span> <span style="color: #0000ff;">true</span><span style="color: #000000;">;</span><span style="color: #008080;">87</span> }<span style="color: #0000ff;">else</span><span style="color: #000000;">{</span><span style="color: #008080;">88</span> <span style="color: #0000ff;">return</span> <span style="color: #0000ff;">false</span><span style="color: #000000;">;</span><span style="color: #008080;">89</span> <span style="color: #000000;"> }</span><span style="color: #008080;">90</span> <span style="color: #000000;"> }</span><span style="color: #008080;">91</span> <span style="color: #000000;">}</span><span style="color: #008080;">92</span> <span style="color: #008080;">93</span> <span style="color: #008080;">94</span> ?>
