微信公众平台开发:网页获取用户地理位置

<?php
class JSSDK {
private $appId;
private $appSecret;
 
public function __construct($appId, $appSecret) {
    $this->appId = $appId;
    $this->appSecret = $appSecret;
}
 
public function getSignPackage() {
    $jsapiTicket = $this->getJsApiTicket();
     
    // 注意 URL 一定要动态获取，不能 hardcode.
    $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
    $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
     
    $timestamp = time();
    $nonceStr = $this->createNonceStr();
     
    // 这里参数的顺序要按照 key 值 ASCII 码升序排序
    $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";
     
    $signature = sha1($string);
     
    $signPackage = array(
        "appId" => $this->appId,
        "nonceStr" => $nonceStr,
        "timestamp" => $timestamp,
        "url" => $url,
        "signature" => $signature,
        "rawString" => $string
    );
    return $signPackage;
}
 
private function createNonceStr($length = 16) {
    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    $str = "";
    for ($i = 0; $i < $length; $i++) {
        $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
}
 
private function getJsApiTicket() {
    // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
    $data = json_decode(file_get_contents("jsapi_ticket.json"));
    if ($data->expire_time < time()) {
        $accessToken = $this->getAccessToken();
        // 如果是企业号用以下 URL 获取 ticket
        // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
        $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
        $res = json_decode($this->httpGet($url));
        $ticket = $res->ticket;
        if ($ticket) {
            $data->expire_time = time() + 7000;
            $data->jsapi_ticket = $ticket;
            $fp = fopen("jsapi_ticket.json", "w");
            fwrite($fp, json_encode($data));
            fclose($fp);
        }
    } else {
        $ticket = $data->jsapi_ticket;
    }
     
    return $ticket;
}
 
private function getAccessToken() {
    // access_token 应该全局存储与更新，以下代码以写入到文件中做示例
    $data = json_decode(file_get_contents("access_token.json"));
    if ($data->expire_time < time()) {
        // 如果是企业号用以下URL获取access_token
        // $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
        $res = json_decode($this->httpGet($url));
        $access_token = $res->access_token;
        if ($access_token) {
            $data->expire_time = time() + 7000;
            $data->access_token = $access_token;
            $fp = fopen("access_token.json", "w");
            fwrite($fp, json_encode($data));
            fclose($fp);
        }
    } else {
        $access_token = $data->access_token;
    }
    return $access_token;
}
 
private function httpGet($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($curl, CURLOPT_URL, $url);
     
    $res = curl_exec($curl);
    curl_close($curl);
     
    return $res;
}
}