夺命雷公狗---微信开发05----根据用户输入返回指定图片，且图片入库

废话不多说，先来创建数据库：

--keep_image_uploads表 [在数据库wxdb中，如果没有该数据库，请先创建该数据库]
CREATE TABLE IF NOT EXISTS keep_image_uploads (
id int UNSIGNED PRIMARY KEY auto_increment,
openid varchar(255) NOT NULL DEFAULT ‘‘,
media_id varchar(128) NOT NULL DEFAULT ‘‘,
media_path varchar(64) NOT NULL DEFAULT ‘‘
) ENGINE = MyISAM DEFAULT CHARSET = utf8;

温馨提醒：

如果在测试的时候表里加了数据我们也可以通过这条sql语句来对数据表进行清空：

truncate table keep_image_uploads；

开工，index.php的代码如下：

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

//define your token
require_once "common.php";
define("TOKEN", "twgdh");
$wechatObj = new wechatCallbackapiTest();
//当接入成功后，请注销这句话，否则，会反复验证。
//$wechatObj->valid();
//添加响应请求的语句
$wechatObj->responseMsg();

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 */
                // 使用simplexml技术对xml进行解析
                // libxml_disable_entity_loader(true), 是从安全性考虑，为了防止xml外部注入，
                //只对xml内部实体内容进行解析
                libxml_disable_entity_loader(true);
                //加载 postStr 字符串
                  $postObj = simplexml_load_string($postStr, ‘SimpleXMLElement‘, LIBXML_NOCDATA);
                file_put_contents(‘abc.log‘, "\r\n\r\n". $postStr, FILE_APPEND);
                $fromUsername = $postObj->FromUserName;
                file_put_contents(‘abc.log‘, "\r\n\r\n". $fromUsername, FILE_APPEND);
                $toUsername = $postObj->ToUserName;
                file_put_contents(‘abc.log‘, "\r\n\r\n". $toUsername, FILE_APPEND);
                $keyword = trim($postObj->Content);
                $time = time();
                global $tmp_arr;
                //根据接收到的消息类型，来进行分支处理(switch)
                switch($postObj->MsgType)
                {
                    case ‘event‘:
                        if($postObj->Event == ‘subscribe‘)
                        {

                            $contentStr = "欢迎关注leigood微信测试号噢";
                            $resultStr = sprintf($tmp_arr[‘text‘], $fromUsername, $toUsername, $time, $contentStr);
                            echo $resultStr;
                        }
                        break;
                    case ‘text‘: //回复文本模块
                        //必须是以“图片”开头，后面并且是以数字结尾
                        if(preg_match("/^图片([0-9][0-9]*)$/u",$keyword,$matches)){
                            $connect = mysql_connect(‘localhost‘,‘root‘,‘root‘);
                            mysql_select_db(‘wxdb‘,$connect);
                            mysql_query(‘set names utf8‘);
                            $matches = array();
                            preg_match("/^图片([0-9][0-9]*)$/u",$keyword,$matches);
                            $sql = "select media_id from keep_image_uploads where id=$matches[1]";
                            $res = mysql_query($sql,$connect);
                            if($row = mysql_fetch_assoc($res)){
                                //先取出么media_id
                                $media_id = $row[‘media_id‘];
                                $resultStr = sprintf($tmp_arr[‘image‘], $fromUsername, $toUsername, $time, $media_id);
                                echo $resultStr;
                            }else{
                                $contentStr = ‘该图片还没上传噢！‘;
                                $resultStr = sprintf($tmp_arr[‘text‘], $fromUsername, $toUsername, $time, $contentStr);
                                echo $resultStr;
                            }
                        }else{
                            $contentStr = ‘您输入的格式有误‘;
                            $resultStr = sprintf($tmp_arr[‘text‘], $fromUsername, $toUsername, $time, $contentStr);
                            echo $resultStr;
                        }
                        break;
                    case ‘image‘: //处理用户上传图片
                        $media_id = $postObj -> MediaId; //获取到用户上传的图片的mediaid
                        $resultStr = sprintf($tmp_arr[‘image‘], $fromUsername, $toUsername, $time, $media_id);
                        echo $resultStr;

                        //将图片保存到本地服务器的文件系统
                        //1.先给图片创建一个名字
                        $image_file_name = time().‘.jpg‘;
                        //2.获取该图片的内容
                        $image_file = file_get_contents($postObj->PicUrl);
                        //3.保存到本地服务器的文件系统
                        //提醒：一定要保证您创建的文件夹是www用户可读可写，否则无法保存该图片到文件夹下
                        file_put_contents("./uploadimage/".$image_file_name,$image_file);

                        //将图片的路径和相关信息入库
                        //1.创建一张表
                        //2.链接mysql数据库，并且添加图片信息
                        $connect = mysql_connect(‘localhost‘,‘root‘,‘root‘);
                        mysql_select_db(‘wxdb‘,$connect);
                        mysql_query(‘set names utf8‘);
                        $media_path = "./uploadimage/".$image_file_name; //路径
                        $sql = "insert into keep_image_uploads (id,openid,media_id,media_path) values(NULL,‘{$fromUsername}‘,‘{$media_id}‘,‘{$media_path}‘)";
                        mysql_query($sql,$connect);
                        break;

                }
        }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;
        }
    }
}

?>

common.php代码如下：

<?php
    $tmp_arr = array(
    ‘text‘ => <<<XML
<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[%s]]></Content>
<FuncFlag>0</FuncFlag>
</xml>
XML
,
    ‘image‘=> <<<XML
<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[image]]></MsgType>
<Image>
<MediaId><![CDATA[%s]]></MediaId>
</Image>
</xml>
XML
    );