如何在微信浏览器的H5商城获取用户openid

一、通过JS获取授权code
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getQueryString()方法功能是获取URL链接上的参数
二、PHP后端处理
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class UserapiController{
public function authorize(){
if (isset($_GET['code'])) {
$code = $_GET['code'];
$data = $this->getUserInfoBycode($code);
$openid = $data['openid'];
$ret['openid'] = $openid;
$this->ajaxReturn($ret,'JSON');
}
}
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public function getUserInfoBycode($code){  
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$res = $this->http('https://api.weixin.qq.com/sns/oauth2/access_token', array('appid' => _APPID, 'secret' => _APPSECRET, 'code' => $code, 'grant_type' => 'authorization_code'), '', 'GET');  
        if ($res) {  
            return $res;  
        }  
  
        return false;  
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}  
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/** 
     * 发送HTTP请求方法，目前只支持CURL发送请求 
     * @param  string $url    请求URL 
     * @param  array  $param  GET参数数组 
     * @param  array  $data   POST的数据，GET请求时该参数无效 
     * @param  string $method 请求方法GET/POST 
     * @return array          响应数据 
     */  
    public function http($url, $param, $data = '', $method = 'GET') {  
        $opts = array(  
            CURLOPT_TIMEOUT => 30,  
            CURLOPT_RETURNTRANSFER => 1,  
            CURLOPT_SSL_VERIFYPEER => false,  
            CURLOPT_SSL_VERIFYHOST => false,  
        );  

/* 根据请求类型设置特定参数 */  
        $opts[CURLOPT_URL] = $url . '?' . http_build_query($param);  

if (strtoupper($method) == 'POST') {  
            $opts[CURLOPT_POST] = 1;  
            $opts[CURLOPT_POSTFIELDS] = $data;  

if (is_string($data)) { //发送JSON数据  
                $opts[CURLOPT_HTTPHEADER] = array(  
                    'Content-Type: application/json; charset=utf-8',  
                    'Content-Length: ' . strlen($data),  
                );  
            }  
        }  

/* 初始化并执行curl请求 */  
        $ch = curl_init();  
        curl_setopt_array($ch, $opts);  
        $data = curl_exec($ch);  
        $error = curl_error($ch);  
        curl_close($ch);  
        //发生错误，抛出异常  
        if ($error)  
            throw new \Exception('请求发生错误：' . $error);  
  
        return json_encode($data);  
    }  
}