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，token自动回复

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> 1</span> <?<span>php
</span><span> 2</span> <span>/*</span><span>*
</span><span> 3</span> <span>  * wechat php test
</span><span> 4</span>   <span>*/</span>
<span> 5</span> 
<span> 6</span> <span>//</span><span>define your token</span>
<span> 7</span> <span>define</span>("TOKEN", "codcodog"<span>);
</span><span> 8</span> 
<span> 9</span> <span>$wechatObj</span> = <span>new</span><span> wechatCallbackapiTest();
</span><span>10</span> <span>//</span><span>$wechatObj->valid();</span>
<span>11</span> <span>$wechatObj</span>-><span>responseMsg();
</span><span>12</span> 
<span>13</span> <span>class</span><span> wechatCallbackapiTest
</span><span>14</span> <span>{
</span><span>15</span>     <span>public</span> <span>function</span><span> valid()
</span><span>16</span> <span>    {
</span><span>17</span>         <span>$echoStr</span> = <span>$_GET</span>["echostr"<span>];
</span><span>18</span> 
<span>19</span>         <span>//</span><span>valid signature , option</span>
<span>20</span>         <span>if</span>(<span>$this</span>-><span>checkSignature()){
</span><span>21</span>         <span>header</span>('content-type:text'<span>);
</span><span>22</span>             <span>echo</span> <span>$echoStr</span><span>;
</span><span>23</span>             <span>exit</span><span>;
</span><span>24</span> <span>        }
</span><span>25</span> <span>    }
</span><span>26</span> 
<span>27</span>     <span>public</span> <span>function</span><span> responseMsg()
</span><span>28</span> <span>    {
</span><span>29</span>         <span>//</span><span>get post data, May be due to the different environments</span>
<span>30</span>         <span>$postStr</span> = <span>$GLOBALS</span>["HTTP_RAW_POST_DATA"<span>];
</span><span>31</span>         <span>//</span><span>$postStr = file_get_contents("php://input");</span>
<span>32</span>         <span>file_put_contents</span>("log.txt",<span>$postStr</span>,<span>FILE_APPEND );
</span><span>33</span>           <span>//</span><span>extract post data</span>
<span>34</span>         <span>if</span> (!<span>empty</span>(<span>$postStr</span><span>)){
</span><span>35</span>                 <span>/*</span><span> libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
</span><span>36</span> <span>                   the best way is to check the validity of xml by yourself </span><span>*/</span>
<span>37</span>                 libxml_disable_entity_loader(<span>true</span><span>);
</span><span>38</span>                   <span>$postObj</span> = <span>simplexml_load_string</span>(<span>$postStr</span>, 'SimpleXMLElement',<span> LIBXML_NOCDATA);
</span><span>39</span>                 <span>$fromUsername</span> = <span>$postObj</span>->FromUserName; <span>//</span><span>用户</span>
<span>40</span>                 <span>$toUsername</span> = <span>$postObj</span>->ToUserName;     <span>//</span><span>公众平台</span>
<span>41</span>                 <span>$keyword</span> = <span>trim</span>(<span>$postObj</span>-><span>Content);
</span><span>42</span>                 <span>$time</span> = <span>time</span><span>();
</span><span>43</span>                 <span>$textTpl</span> = "<span><xml>
</span><span>44</span> <span>                            <ToUserName><![CDATA[%s]]></ToUserName>
</span><span>45</span> <span>                            <FromUserName><![CDATA[%s]]></FromUserName>
</span><span>46</span> <span>                            <CreateTime>%s</CreateTime>
</span><span>47</span> <span>                            <MsgType><![CDATA[%s]]></MsgType>
</span><span>48</span> <span>                            <Content><![CDATA[%s]]></Content>
</span><span>49</span> <span>                            <FuncFlag>0</FuncFlag>
</span><span>50</span>                             </xml>"<span>;             
</span><span>51</span>                 <span>if</span>(!<span>empty</span>( <span>$keyword</span><span> ))
</span><span>52</span> <span>                {
</span><span>53</span>                       <span>$msgType</span> = "text"<span>;
</span><span>54</span>                     <span>$contentStr</span> = "Welcome to wechat world!"<span>;
</span><span>55</span>                     <span>$resultStr</span> = <span>sprintf</span>(<span>$textTpl</span>, <span>$fromUsername</span>, <span>$toUsername</span>, <span>$time</span>, <span>$msgType</span>, <span>$contentStr</span><span>);
</span><span>56</span>                     <span>echo</span> <span>$resultStr</span><span>;
</span><span>57</span>                 }<span>else</span><span>{
</span><span>58</span>                     <span>echo</span> "Input something..."<span>;
</span><span>59</span> <span>                }
</span><span>60</span> 
<span>61</span>         }<span>else</span><span> {
</span><span>62</span>             <span>echo</span> ""<span>;
</span><span>63</span>             <span>exit</span><span>;
</span><span>64</span> <span>        }
</span><span>65</span> <span>    }
</span><span>66</span>         
<span>67</span>     <span>private</span> <span>function</span><span> checkSignature()
</span><span>68</span> <span>    {
</span><span>69</span>         <span>//</span><span> you must define TOKEN by yourself</span>
<span>70</span>         <span>if</span> (!<span>defined</span>("TOKEN"<span>)) {
</span><span>71</span>             <span>throw</span> <span>new</span> <span>Exception</span>('TOKEN is not defined!'<span>);
</span><span>72</span> <span>        }
</span><span>73</span>         
<span>74</span>         <span>$signature</span> = <span>$_GET</span>["signature"<span>];
</span><span>75</span>         <span>$timestamp</span> = <span>$_GET</span>["timestamp"<span>];
</span><span>76</span>         <span>$nonce</span> = <span>$_GET</span>["nonce"<span>];
</span><span>77</span>                 
<span>78</span>         <span>$token</span> =<span> TOKEN;
</span><span>79</span>         <span>$tmpArr</span> = <span>array</span>(<span>$token</span>, <span>$timestamp</span>, <span>$nonce</span><span>);
</span><span>80</span>         <span>//</span><span> use SORT_STRING rule</span>
<span>81</span>         <span>sort</span>(<span>$tmpArr</span>,<span> SORT_STRING);
</span><span>82</span>         <span>$tmpStr</span> = <span>implode</span>( <span>$tmpArr</span><span> );
</span><span>83</span>         <span>$tmpStr</span> = <span>sha1</span>( <span>$tmpStr</span><span> );
</span><span>84</span>         
<span>85</span>         <span>if</span>( <span>$tmpStr</span> == <span>$signature</span><span> ){
</span><span>86</span>             <span>return</span> <span>true</span><span>;
</span><span>87</span>         }<span>else</span><span>{
</span><span>88</span>             <span>return</span> <span>false</span><span>;
</span><span>89</span> <span>        }
</span><span>90</span> <span>    }
</span><span>91</span> <span>}
</span><span>92</span> 
<span>93</span> 
<span>94</span> ?>

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