微信公众平台开发学习

   PHP开发这门课吧，老师说期末考察就是做一个微信公众号，所以就此入坑微信公众平台开发，哈哈，算是学一点新的东西吧~

   本文持续更新中

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准备工作

1.在微信公众平台 上进行注册，我这里注册的是个人账号，这里打个小广告，我的微信公众号：不过时光

2.注册的详细过程我就不说啦。接入微信公众号平台进行开发需要

1. 填写服务器配置
2. 验证服务器地址的有效性
3. 依据接口文档实现业务逻辑

在进行服务器的配置前，需要对服务器进行相关的设置
我在这里用的是腾讯云的学生机
Ubuntu16.04 64位
首先需要安装LAMP环境

mysql 安装：sudo apt install mysql-server
apache 安装：sudo apt install apache2
php 安装：sudo apt install php
apache-php模块安装：sudo apt install libapache2-mod-php7.0 

然后将sudo chmod 777 /var/www 使得我们可有权对www下的文件进行创建和更改

service apache2 restart
service mysql restart

在目录下将index.php的内容改为：

<?php
/**
  * wechat php test
  */

//define your token
define("TOKEN", "weixin");//此处为你自己设置的Token
$wechatObj = new wechatCallbackapiTest();
$wechatObj->valid();

class wechatCallbackapiTest
{
    public function valid()
    {
        $echoStr = $_GET["echostr"];

        //valid signature , option
        if($this->checkSignature()){
            echo $echoStr;
            exit;
        }
    }

    public function responseMsg()
    {
        //get post data, May be due to the different environments
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

        //extract post data
        if (!empty($postStr)){
                /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
                   the best way is to check the validity of xml by yourself */
                libxml_disable_entity_loader(true);
                $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                $time = time();
                $textTpl = "<xml>
                            <ToUserName><![CDATA[%s]]></ToUserName>
                            <FromUserName><![CDATA[%s]]></FromUserName>
                            <CreateTime>%s</CreateTime>
                            <MsgType><![CDATA[%s]]></MsgType>
                            <Content><![CDATA[%s]]></Content>
                            <FuncFlag>0</FuncFlag>
                            </xml>";             
                if(!empty( $keyword ))
                {
                    $msgType = "text";
                    $contentStr = "Welcome to wechat world!";
                    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                    echo $resultStr;
                }else{
                    echo "Input something...";
                }

        }else {
            echo "";
            exit;
        }
    }

    private function checkSignature()
    {
        // you must define TOKEN by yourself
        if (!defined("TOKEN")) {
            throw new Exception('TOKEN is not defined!');
        }

        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];

        $token = TOKEN;
        $tmpArr = array($token, $timestamp, $nonce);
        // use SORT_STRING rule
        sort($tmpArr, SORT_STRING);
        $tmpStr = implode( $tmpArr );
        $tmpStr = sha1( $tmpStr );

        if( $tmpStr == $signature ){
            return true;
        }else{
            return false;
        }
    }
}

?>

然后在微信公众号平台提交服务器配置就好啦。