帝国CMS微信分享带缩略图的方法

<?
//开始微信分享代码
require '../../jssdk.php';
$appid = '******';
$appsecret = '******';
$jssdk = new JSSDK($appid,$appsecret);
$signPackage = $jssdk->GetSignPackage();
//结束微信分享代码
?>
<script src="http://res.wx.qq.com/open/js/jweixin-1.4.0.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({
debug: !1,
appId: '<?php echo $signPackage["appId"];?>',
timestamp: <?php echo $signPackage["timestamp"];?>,
nonceStr: '<?php echo $signPackage["nonceStr"];?>',
signature: '<?php echo $signPackage["signature"];?>',
jsApiList: [
"updateAppMessageShareData",
"updateTimelineShareData",
"onMenuShareWeibo",
"onMenuShareQZone"
]
});
wx.ready(function () {
// 在这里调用 API
wx.checkJsApi({
jsApiList: ["updateAppMessageShareData",
"updateTimelineShareData",
"onMenuShareWeibo",
"onMenuShareQZone"], // 需要检测的JS接口列表，所有JS接口列表见附录2,
success: function(res) {
//alert(JSON.stringify(res));
if(res.errMsg !='checkJsApi:ok'){
alert('请升级您的微信版本');
return;
}
}
});
//分享Demo
//获取“分享给朋友”按钮点击状态及自定义分享内容接口
wx.updateAppMessageShareData({ 
title: '<?=$navinfor[title]?>', // 分享标题
desc: '<?=$navinfor[smalltext]?>', // 分享描述
link: 'http://www.xxx.com<?=$navinfor[titleurl]?>', // 分享链接
imgUrl: '<?=$navinfor[titlepic]?>', // 分享图标
success: function () {
// 设置成功
}
});
//获取“分享到朋友圈”按钮点击状态及自定义分享内容接口
wx.updateTimelineShareData({ 
title: '<?=$navinfor[title]?>', // 分享标题
link: 'http://www.xxx.com<?=$navinfor[titleurl]?>', // 分享链接
imgUrl: '<?=$navinfor[titlepic]?>', // 分享图标
success: function () {
// 设置成功
}
});
wx.onMenuShareWeibo({
title: '<?=$navinfor[title]?>', // 分享标题
desc: '<?=$navinfor[smalltext]?>', // 分享描述
link: 'http://www.xxx.com<?=$navinfor[titleurl]?>', // 分享链接
imgUrl: '<?=$navinfor[titlepic]?>', // 分享图标
success: function () { 
// 用户确认分享后执行的回调函数
},
cancel: function () { 
// 用户取消分享后执行的回调函数
}
});
});
</script>

<?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;
  }
}
?>