ThinkPHP5 获取JSSDK微信分享功能签名

function getShareSignaTure($url){
        $appID='**************';
        $appSecret='*********************************';

        $jssdk = new JSSDK($appID, $appSecret);  

        //确保你获取用来签名的url是动态获取的，动态页面可参见实例代码中php的实现方式。
        //如果是html的静态页面在前端通过ajax将url传到后台签名，前端需要用js获取当前页面除去'#'hash部分的链接
        //（可用location.href.split('#')[0]获取,而且需要encodeURIComponent），
        //因为页面一旦分享，微信客户端会在你的链接末尾加入其它参数，如果不是动态获取当前链接，将导致分享后的页面签名失败。

        //后台接收到url 需要进行解析

        $signPackage = $jssdk->GetSignPackage(urldecode($url));
        if(!isset($signPackage)){
            return $this->apiNullJson(101);
        }
        $data=[
            'timesTamp'=>$signPackage["timestamp"],
            'nonceStr'=>$signPackage["nonceStr"],
            'signaTure'=>$signPackage["signature"]
        ];
        return $this->apiDataJson(0,$data);
    }

创建JSSDK.php类

<?php

namespace app\common;

class JSSDK
{
    private $appId;
    private $appSecret;

    public function __construct($appId, $appSecret)
    {
        $this->appId = $appId;
        $this->appSecret = $appSecret;
    }

    public function getSignPackage($url)
    {
        $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
        $data = json_decode(file_get_contents("jsapi_ticket.json",true),true);
        if (!isset($data)||$data['expires']<time()||!isset($data['jsapi_ticket'])) {
            $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 = array();
                $data['expires'] = 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
        $data = json_decode(file_get_contents("access_token.json",true),true);
        if (!isset($data)||$data['expires'] < time()||!isset($data['access_token'])){
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
            $res = json_decode($this->httpGet($url));
            $access_token = $res->access_token;
            if ($access_token) {
                $data = array();
                $data['access_token']= time() + 7000;
                $data['expires']= $access_token;
                $fp = fopen("access_token.json", "w");
                fwrite($fp, json_encode($data));
                fclose($fp);
                return $data['access_token'];
            }
        } else {
            $access_token = $data['access_token'];
        }
        return $access_token;
    }

    private function httpGet($url)
    {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_TIMEOUT, 500);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_URL, $url);
        $res = curl_exec($curl);
        curl_close($curl);
//        dump($res);
        return $res;
    }
}

分享接口的官方新文档链接：   https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421141115