实现原生微信接入 当用户关注/发送消息时对应内容回应

1. 实现微信接入
2. 实现功能 当用户关注时 回复文本消息你好
3. 当用户在公众号中回复内容时，回复图片消息。
4. 当用户在公众号发送固定内容(只要内容中存在指定内容即可，未必全匹配)时，回复图文消息。
   扩展：当用户发送指定内容时，随机发送一种类型消息

演示图

共4个文件 index.php config.php Message.php WeChat.php

index.php 入口文件

<?php
//封装代码调用
include 'config.php';
include 'WeChat.php';
include 'Message.php';
$obj = new Message();
$obj->postText();

config.php 定义TOKEY

<?php
define( 'TOKEN', 'yuanyiruciphp' );

WeChat.php 与微信接入文件

<?php
class WeChat
 {
    private $token = TOKEN;
    public function checkSignature()
 {
        $signature = $_GET['signature'];
        $timestamp = $_GET['timestamp'];
        $nonce = $_GET['nonce'];
        $echostr = $_GET['echostr'];
        $tmpArr = array( $this->token, $timestamp, $nonce );
        sort( $tmpArr, SORT_STRING );
        $tmpStr = implode( $tmpArr );
        $tmpStr = sha1( $tmpStr );
        //进行比对
        if ( $tmpStr == $signature ) {
            echo $echostr;
        } else {
            echo false;
        }
    }
}

Message.php 消息会话管理文件

<?php
class Message extends WeChat
 {
    function postText()
 {
        if ( $_SERVER['REQUEST_METHOD'] == 'GET' ) {
            //开发者服务器验证
            $this->checkSignature();
        } elseif ( $_SERVER['REQUEST_METHOD'] == 'POST' ) {
            //接收
            $xml = file_get_contents( 'php://input' );
            if ( !empty( $xml ) ) {
                $obj = simplexml_load_string( $xml, 'SimpleXMLElement', LIBXML_NOCDATA );
                $toUser = $obj->FromUserName;
                $formUser = $obj->ToUserName;
                $time = time();
                //如果是关注
                if ( strtolower( $obj->MsgType ) == 'event' ) {
                    if ( strtolower( $obj->Event ) == 'subscribe' ) {
                        $msgType = 'text';
                        $content = '你好,感谢你的关注';
                        //回复用户关注的相关信息
                        $this->text( $toUser, $formUser, $time, $msgType, $content );
                    }
                }
                //如果发送文本消息
                if ( strtolower( $obj->MsgType ) == 'text' && preg_match( '/你好/S', $obj->Content ) ) {
                    $title = '带有你好内容的回复';
                    $description = '带有你好内容的回复内容介绍带有你好内容的回复内容介绍';
                    $picUrl = 'https://www.php.cn/static/images/logo1.png';
                    $url = 'https://www.php.cn/';
                    $this->imgText( $toUser, $formUser, $time, 1, $title, $description, $picUrl, $url );
                } elseif ( strtolower( $obj->MsgType ) == 'text' && preg_match( '/开心/S', $obj->Content ) ) {
                    $msgType = 'text';
                    $content = '带有开心的文本回复';
                    $this->text( $toUser, $formUser, $time, $msgType, $content );
                } else {
                    $title = '任意消息回复';
                    $description = '任意消息回复内容介绍任意消息回复内容介绍';
                    $picUrl = 'https://img.php.cn/upload/course/000/000/001/60b5cd439a6b7169.png';
                    $url = 'https://www.php.cn/';
                    $this->imgText( $toUser, $formUser, $time, 1, $title, $description, $picUrl, $url );
                }
            }
        }
    }
    //回复文本消息
    protected function text( $toUser, $formUser, $time, $msgtype, $content )
 {
        $templade = "<xml>
                      <ToUserName><![CDATA[%s]]></ToUserName>
                      <FromUserName><![CDATA[%s]]></FromUserName>
                      <CreateTime>%s</CreateTime>
                      <MsgType><![CDATA[%s]]></MsgType>
                      <Content><![CDATA[%s]]></Content>
                    </xml>
                    ";
        $info = sprintf( $templade, $toUser, $formUser, $time, $msgtype, $content );
        echo $info;
    }
    //回复图文消息
    protected function  imgText( $toUser, $formUser, $time, $num, $title, $description, $picurl, $url )
 {
        $templade = "<xml>
                      <ToUserName><![CDATA[%s]]></ToUserName>
                      <FromUserName><![CDATA[%s]]></FromUserName>
                      <CreateTime>%s</CreateTime>
                      <MsgType><![CDATA[news]]></MsgType>
                      <ArticleCount>%s</ArticleCount>
                      <Articles>
                        <item>
                          <Title><![CDATA[%s]]></Title>
                          <Description><![CDATA[%s]]></Description>
                          <PicUrl><![CDATA[%s]]></PicUrl>
                          <Url><![CDATA[%s]]></Url>
                        </item>
                      </Articles>
                    </xml>";
        $info = sprintf( $templade, $toUser, $formUser, $time, $num, $title, $description, $picurl, $url );
        echo $info;
    }
}