微信二次开发中跳转第三方网页

首先要将微信网页开发配置好域名

如下：

接着进入自己的测试号，联通接口

php代码如下：

public function index(){
        //公众号
        $appid = 'wx3aba37a42092d4ac';
        $redirect_uri = urlencode('http://zhang-rui.top/vote/index.php/home/index/getcode');//将字符串以URL编码
        $url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=$appid&redirect_uri=$redirect_uri&response_type=code&scope=snsapi_userinfo&state=1#wechat_redirect";
        header("Location:". $url);//header()函数向客户端发送原始的HTTP报头

    }

注意：appid是自己的测试号

用户同意授权，获取code，如下为获取code接口

https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect

PHP代码如下：

public function getcode(){
    	$code = $_GET["code"];//预定义的$_GET 变量用于收集来自method=“get”的表单中的值

    	// echo $code;
    	$json = $this->access_token($code);
    	//json转化成数组
    	$arr = json_decode($json,true);
    	$arr = array_change_key_case($arr,CASE_LOWER);//将数组中的键转化小写
    	if (isset($arr['access_token']) && isset($arr['openid'])) {
    		// echo "111";
    		$result = $this->userinfo($arr['access_token'],$arr['openid']);
    		print_r($result);
    	}else{
    		echo "获取access_token出错".$json;
    	}
    }

通过code获取access_token

 //获取access_token
    private function access_token($code){
    	$appid = 'xxxxxx';//自己微信公众号的appid
    	$appsecret = "xxxxxx";//自己微信公众号的appsecret 
    	$url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appid&secret=$appsecret&code=$code&grant_type=authorization_code";
    	// return $url;

    	$ret = https_request($url);
    	return $ret;
    }

获取用户信息

//获取用户信息
    private function userinfo($access_token,$openid){
    	// echo "123";
    	// echo $access_token;
    	// echo $openid;
    	$url = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid";
    	$userinfo_json = https_request($url);
    	$userinfo_array = json_decode($userinfo_json,true);
    	array_change_key_case($userinfo_array,CASE_LOWER);
    	return $userinfo_array;
    }