实战原生微信接入和消息回复

1. 实现微信接入

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

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

class Message extends WechatAccess
{
    function postText()
    {
        if ($_SERVER['REQUEST_METHOD'] == 'GET') {
            $this->checkSignature();
        } elseif ($_SERVER['REQUEST_METHOD'] == 'POST') {
            $xml = file_get_contents('php://input');
            if (!empty($xml)) {
                $postObj = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
                $toUser = $postObj->FromUserName;
                $fromUser = $postObj->ToUserName;
                $time = time();
                if ($postObj->MsgType == 'event') {
                    if ($postObj->Event == 'subscribe') {
                        $content = '你这么好看，关注我就对了';
                        $this->text($toUser, $fromUser, $time, $content);
                    }
                } elseif ($postObj->MsgType == 'text' && preg_match('/\d/S', $postObj->Content)) {
                    $content = '您好，有什么需要帮助你的吗？';
                    $this->text($toUser, $fromUser, $time, $content);
                } elseif ($postObj->MsgType == 'text' && preg_match('/^文章/', $postObj->Content)) {
                    $title = '叮！请查收『Dr.Yu开学护肤指南』· 文末正装礼';
                    $description = '新学期，玩点厉害的，宠粉开始...';
                    $picurl = 'https://img.zcool.cn/community/0114705c45d80ea801213f26f0c42c.gif';
                    $url = 'https://php.cn';
                    $this->ImgText($toUser, $fromUser, $time, $title, $description, $picurl, $url);
                } elseif ($postObj->MsgType == 'text' && preg_match('/^aa/', $postObj->Content)) {
                    $title = '叮！请查收『Dr.Yu开学护肤指南』· 文末正装礼';
                    $description = '新学期，玩点厉害的，宠粉开始...';
                    $picurl = 'https://img.zcool.cn/community/0114705c45d80ea801213f26f0c42c.gif';
                    $url = 'https://php.cn';
                    $content = '随机';
                    $arr = array($this->ImgText($toUser, $fromUser, $time, $title, $description, $picurl, $url), $this->text($toUser, $fromUser, $time, $content));
                    array_rand($arr);
                } elseif ($postObj->MsgType == 'image') {
                }
            }
        }
    }
    private function text($toUser, $fromUser, $time, $content)
    {
        $str = "<xml>
        <ToUserName><![CDATA[%s]]></ToUserName>
        <FromUserName><![CDATA[%s]]></FromUserName>
        <CreateTime>%s</CreateTime>
        <MsgType><![CDATA[text]]></MsgType>
        <Content><![CDATA[%s]]></Content>
      </xml>
                    ";
        echo sprintf($str, $toUser, $fromUser, $time, $content);
    }
    private function ImgText($toUser, $fromUser, $time, $title, $description, $picurl, $url)
    {
        $str = "<xml>
        <ToUserName><![CDATA[%s]]></ToUserName>
        <FromUserName><![CDATA[%s]]></FromUserName>
        <CreateTime>%s</CreateTime>
        <MsgType><![CDATA[news]]></MsgType>
        <ArticleCount>1</ArticleCount>
        <Articles>
          <item>
            <Title><![CDATA[%s]]></Title>
            <Description><![CDATA[%s]]></Description>
            <PicUrl><![CDATA[%s]]></PicUrl>
            <Url><![CDATA[%s]]></Url>
          </item>
        </Articles>
      </xml>
        ";
        echo sprintf($str, $toUser, $fromUser, $time, $title, $description, $picurl, $url);
    }
}