微信-网页授权获取用户openid
第一步：用户同意授权，获取code
在确保微信公众账号拥有授权作用域（scope参数）的权限的前提下（服务号获得高级接口后，默认带有scope参数中的snsapi_base和snsapi_userinfo），引导关注者打开如下页面：
https://open.weixin.qq.com/connect/oauth3/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect
所以
先用调试接口生成自定义菜单，菜单json如下：
{
"button":[
{
"name":"风信科技",
"sub_button":[
{
"type":"click",
"name":"关于风信",
"key":"FS_V1_1001"
},
{
"type":"click",
"name":"我们的服务",
"key":"FS_V1_1002"
},
{
"type":"click",
"name":"成功案例",
"key":"FS_V1_1003"
},
{
"type":"click",
"name":"解决方案",
"key":"FS_V1_1004"
},
{
"type":"click",
"name":"OA通讯录",
"key":"FS_V1_1005"
}]
},
{
"name":"风信产品",
"sub_button":[
{
"type":"click",
"name":"平台产品",
"key":"FS_V2_1001"
},
{
"type":"click",
"name":"领域产品",
"key":"FS_V2_1002"
},
{
"type":"click",
"name":"行业产品",
"key":"FS_V2_1003"
},
{
"type":"view",
"name":"微办公",
"url":"https://open.weixin.qq.com/connect/oauth3/authorize?appid=$APPID&redirect_uri=$URL&response_type=code&scope=snsapi_base&state=1#wechat_redirect"
}]
},
{
"name":"风信娱乐",
"sub_button":[
{
"type":"click",
"name":"抽奖活动",
"key":"FS_V3_1001"
},
{
"type":"click",
"name":"查询天气",
"key":"FS_V3_1002"
},
{
"type":"view",
"name":"更多活动",
"url":"http://www.funsing.com/"
}]
}]
}
第二步，获取openId,
public function index() {
$code = I('get.code');
$weid = $this->getOpenId($code);
if ($weid == "") {
$this->redirect('/Home/Index/login', array(), 0, "waiting...");
} else {
$result = json_decode($this->client->IsAccount(array("weId"=>$weid))->IsAccountResult);
$info = $result->ErrMsg;
$this->gotoPage($info, $weid);
}
}//通过code取得openid
public function getOpenId($code) {
$urlpre = "https://api.weixin.qq.com/sns/oauth3/access_token?appid=".$this->appId."&secret=".$this->appsecret."&grant_type=authorization_code&code=";
$url = $urlpre.$code;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
curl_close($ch);
$jsoninfo = json_decode($output, true);
//$access_token = $jsoninfo["access_token"];
$openid = $jsoninfo["openid"];
return $openid;
}