publicfunction get_user_info($code){
// 通過code獲取access_token
    $get_token_url ="https://api.weixin.qq.com/sns/oauth2/access_token?appid=". $this->appid ."secret=". $this->appsecret ."code={$code}grant_type=authorization_code";
    $token_info = $this->https_request($get_token_url);
    $token_info = json_decode($token_info,true);
if(isset($token_info['errcode'])){
      $this->errCode = $token_info['errcode'];
      $this->errMsg = $token_info['errmsg'];
returnfalse;
}
// 通過access_token和openid獲取用戶信息
    $get_userinfo_url ='https://api.weixin.qq.com/sns/userinfo?access_token='. $token_info['access_token'].'openid='. $token_info['openid'].'lang=zh_CN';
    $userinfo = $this->https_request($get_userinfo_url);
    $userinfo = json_decode($userinfo,true);
if(isset($userinfo['errcode'])){
      $this->errCode = $userinfo['errcode'];
      $this->errMsg = $userinfo['errmsg'];
returnfalse;
}
return $userinfo;
}

?php
/**
* 微信授權登錄獲取用戶信息
* @param $appid 微信應用appid
* @param $appsecret 微信應用appsecret
* @author codehui admin@codehui.net> 2018-3-26
*/
classWxOauth
{
private $appid ="";// appid
private $appsecret ="";// appsecret
public $error =[];// 錯誤信息
const GET_ACCESS_TOKEN_URL ='https://api.weixin.qq.com/sns/oauth2/access_token';// 獲取access_token url
const GET_USER_INFO_URL ='https://api.weixin.qq.com/sns/userinfo';// 獲取用戶信息url
const GET_REFRESH_URL ='https://api.weixin.qq.com/sns/oauth2/refresh_token';//刷新access_token
const GET_CODE ='https://open.weixin.qq.com/connect/oauth2/authorize';// 獲取code(網頁授權使用)
publicfunction __construct($appid, $appsecret){
if($appid  $appsecret){
$this->appid = $appid;
$this->appsecret = $appsecret;
}
}
/**
* 微信登錄
* @param string $code 客戶端傳回的code(網頁授權時調用getCode方法獲取code,微信會把code返回給redirect_uri)
* @return array 用戶信息
* @example 錯誤時微信會返回錯誤碼等信息 eg:{"errcode":, "errmsg":""}
*/
publicfunction wxLogin($code){
$token_info = $this->getToken($code);
if(isset($token_info['errcode'])){
$this->error = $token_info;
returnfalse;
}
$user_info = $this->getUserinfo($token_info['openid'], $token_info['access_token']);
if(isset($user_info['errcode'])){
$this->error = $user_info;
returnfalse;
}
return $user_info;
}
/**
* 用戶同意授權獲取code
* @param string $redirect_uri 授權后重定向的回調鏈接地址，需要urlEncode處理
* @return redirect
*/
publicfunction getCode($redirect_uri){
$uri = $this->combineURL(self::GET_CODE,[
'appid'=> $this->appid,
'scope'=>'SCOPE',
'response_type'=>'code',
'redirect_uri'=> urlEncode($redirect_uri),
'state'=>'STATE#wechat_redirect',
]);
header('Location: '. $uri,true);
}
/**
* 獲取token和openid
* @param string $code 客戶端傳回的code
* @return array 獲取到的數據
*/
publicfunction getToken($code){
$get_token_url = $this->combineURL(self::GET_ACCESS_TOKEN_URL,[
'appid'=> $this->appid,
'appsecret'=> $this->appsecret,
'code'=> $code,
'grant_type'=>'authorization_code'
]);
$token_info = $this->httpsRequest($get_token_url);
return json_decode($token_info,true);
}
/**
* 刷新access token并續期
* @param string $refresh_token 用戶刷新access_token
* @return array
*/
publicfunction refreshToken($refresh_token){
$refresh_token_url = $this->combineURL(self::GET_REFRESH_URL,[
'appid'=> $this->appid,
'refresh_token'=> $refresh_token,
'grant_type'=>'refresh_token'
]);
$refresh_info = $this->httpsRequest($refresh_token_url);
return json_decode($refresh_info,true);
}
/**
* 獲取用戶信息
* @param string $openid 用戶的標識
* @param string $access_token 調用接口憑證
* @return array 用戶信息
*/
publicfunction getUserinfo($openid, $access_token){
$get_userinfo_url = $this->combineURL(self::GET_USER_INFO_URL,[
'openid'=> $openid,
'access_token'=> $access_token,
'lang'=>'zh_CN'
]);
$user_info = $this->httpsRequest($get_userinfo_url);
return json_decode($user_info,true);
}
/**
* 拼接url
* @param string $baseURL 請求的url
* @param array $keysArr 參數列表數組
* @return string 返回拼接的url
*/
publicfunction combineURL($baseURL, $keysArr){
$combined = $baseURL ."?";
$valueArr = array();
foreach($keysArr as $key => $val){
$valueArr[]="$key=$val";
}
$keyStr = implode("", $valueArr);
$combined .=($keyStr);
return $combined;
}
/**
* 獲取服務器數據
* @param string $url 請求的url
* @return unknown 請求返回的內容
*/
publicfunction httpsRequest($url){
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($curl, CURLOPT_RETURNTRANSFER,1);
$output = curl_exec($curl);
curl_close($curl);
return $output;
}
}

// 移動端使用
$WxOauth =newWxOauth(APPID, APPSECRET);// 傳入appid和appsecret
//公眾號登錄需要先獲取code,下面方法會自動跳轉到微信授權頁面
$WxOauth->getCode();
// 通過移動端傳來的code或者微信回調返回的code獲取用戶信息
$user_info = $WxOauth->wxLogin($_REQUEST['code']);
if($user_info){
//獲取到用戶信息
}else{
// 獲取錯誤
$WxOauth->error;
}