use think\Action; //自己封装的curl方法，详情看附录
define("TOKEN", "你设置的token");

class Customer extends Controller
{
//校验服务器地址URL
public function checkServer(){
if (isset($_GET[\'echostr\'])) {
$this->valid();
}else{
$this->responseMsg();
}
}

public function valid()
{
$echoStr = $_GET["echostr"];
if($this->checkSignature()){
header(\'content-type:text\');
echo $echoStr;
exit;
}else{
echo $echoStr.\'+++\'.TOKEN;
exit;
}
}

private function checkSignature()
{
$signature = $_GET["signature"];
$timestamp = $_GET["timestamp"];
$nonce = $_GET["nonce"];

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

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

public function responseMsg()
{
//此处推荐使用file_get_contents(\'php://input\')获取后台post过来的数据
$postStr = file_get_contents(\'php://input\');
if (!empty($postStr) && is_string($postStr)){
$postArr = json_decode($postStr,true);
if(!empty($postArr[\'MsgType\']) && $postArr[\'MsgType\'] == \'text\'){
//用户给客服发送文本消息
if($postArr[\'Content\'] == 7){
//接收到指定的文本消息，触发事件
$fromUsername = $postArr[\'FromUserName\']; //发送者openid
$media_id = \'上传到微信服务器的图片id，看第三部分\'; //输入想要回复的图片消息的media_id
$this->requestIMAGE($fromUsername,$media_id);
}
}
else if(!empty($postArr[\'MsgType\']) && $postArr[\'MsgType\'] == \'image\'){
//用户给客服发送图片消息，按需求设置
}
else if($postArr[\'MsgType\'] == \'event\' && $postArr[\'Event\']==\'user_enter_tempsession\'){
//用户进入客服事件
$fromUsername = $postArr[\'FromUserName\']; //发送者openid
$content = \'你好,欢迎来到***客服，有什么能帮助您的么\';
$this->requestTXT($fromUsername,$content);
}
else{
exit(\'error\');
}
}else{
echo "empty";
exit;
}
}

//文本回复
public function requestTXT($fromUsername,$content){
$data=array(
"touser"=>$fromUsername,
"msgtype"=>"text",
"text"=>array("content"=>$content)
);
$json = json_encode($data,JSON_UNESCAPED_UNICODE);
$this->requestAPI($json);
}

//图片回复
public function requestIMAGE($fromUsername,$media_id){
$data=array(
"touser"=>$fromUsername,
"msgtype"=>"image",
"image"=>array("media_id"=>$media_id)
);
$json = json_encode($data,JSON_UNESCAPED_UNICODE);
$this->requestAPI($json);
}

public function requestAPI($json){
$access_token = $this->get_accessToken();
$action = new Action(); //自己封装的curl方法，详情看附录
$url = "https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=".$access_token;
$output = $action->curl_post($url,$json);
if($output == 0){
echo \'success\';
exit;
}
}

//调用微信api，获取access_token，有效期7200s
public function get_accessToken(){
$url = \'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=你的appid&secret=你的秘钥\'; //替换成自己的小程序id和secret
$res = file_get_contents($url);
$data = json_decode($res,true);
$token = $data[\'access_token\'];
return $token;
}
}

public function uploadWxMedia(){
$token = $this->get_accessToken();
$type = "image";
$filepath = Env::get(\'root_path\').\'public\\assets\\imageName.png\'; //文件在服务器的绝对路径，按自己存放位置修改
$data = array("media"=>new \CURLFile($filepath)); //php5.6以上必须用这种方法上传文件
$url = "https://api.weixin.qq.com/cgi-bin/media/upload?access_token=".$token."&type=".$type;
$action = new Action(); //封装的curl方法，看附录
$result = $action->curl_post($url,$data);
print_r($result);
}

//调用微信api，获取access_token，有效期7200s
public function get_accessToken(){
$url = \'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=你的appid&secret=你的秘钥\'; //替换成自己的小程序id和secret
$res = file_get_contents($url);
$data = json_decode($res,true);
$token = $data[\'access_token\'];
return $token;
}

namespace think;
class Action
{
//get方式请求接口
public function get_json($url)
{
$data = file_get_contents($url);
//转换成数组
$data = json_decode($data,true);
//输出
return $data;
}
//post方式请求接口
public function curl_post($url,$data,$headers = null)
{
//$data 是一个 array() 数组；未编码
$curl = curl_init(); // 启动一个CURL会话
if(substr($url,0,5)==\'https\'){
// 跳过证书检查
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
//只有在CURL低于7.28.1时CURLOPT_SSL_VERIFYHOST才支持使用1表示true，高于这个版本就需要使用2表示了（true也不行）。
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
}
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
if($headers != null){
//post请求中携带header参数
curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
}
//返回api的json对象
$response = curl_exec($curl);
//关闭URL请求
curl_close($curl);
//返回json对象
return $response;
}
}