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微信JS SDK PHP Demo

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11/30
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一、JSSDK类定义 
<?php

class JSSDK {

  private $appId;

  private $appSecret;

  public function __construct($appId, $appSecret) {

    $this->appId = $appId;

    $this->appSecret = $appSecret;

  }

  public function getSignPackage() {

    $jsapiTicket = $this->getJsApiTicket();

    $url = "http://$_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();

      $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$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()) {

      $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$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_URL, $url);

    $res = curl_exec($curl);

    curl_close($curl);

    return $res;

  }

}

二、类调用 
<?php

require_once "jssdk.php";

$jssdk = new JSSDK("yourAppID", "yourAppSecret");

$signPackage = $jssdk->GetSignPackage();

?>

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <title></title>

</head>

<body>

</body>

<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>

<script>

  // 注意：所有的JS接口只能在公众号绑定的域名下调用，公众号开发者需要先登录微信公众平台进入“公众号设置”的“功能设置”里填写“JS接口安全域名”。

  // 如果发现在 Android 不能分享自定义内容，请到官网下载最新的包覆盖安装，Android 自定义分享接口需升级至 6.0.2.58 版本及以上。

  // 完整 JS-SDK 文档地址：http://mp.weixin.qq.com/wiki/7/aaa137b55fb2e0456bf8dd9148dd613f.html

  wx.config({

    appId: '<?php echo $signPackage["appId"];?>',

    timestamp: <?php echo $signPackage["timestamp"];?>,

    nonceStr: '<?php echo $signPackage["nonceStr"];?>',

    signature: '<?php echo $signPackage["signature"];?>',

    jsApiList: [

      // 所有要调用的 API 都要加到这个列表中

    ]

  });

  wx.ready(function () {

    // 在这里调用 API

  });

</script>

</html>

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