因为公司H5需要用到微信分享，需要保存access_token ，且框架为自用框架，所以自己弄了个简单的分享来实现。

之前说过微信的一些问题，这里不重复说明了。开发微信注意几点

微信开发需要access_token时效7200秒，每天最多请求2000次，重新请求后上次的5分钟内时效

微信分享需要jsapi_ticket时效7200秒，需要access_token 请求

微信分享之后会再URL后面补上分享参数，vue或者其他前端框架需要特别注意这里

下面是自己的代码：

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2017/12/22 0022
 * Time: 上午 10:05
 */

class wxshare
{

    public function __construct()
    {
        $this->app_id = "";
        $this->app_secret = "";
    }

    public function get_access_token()
    {
        $token_info = M('wx_config')->find("id = 1"); //根据自己框架封装的查询方法查询微信数据
        // 判断token 是否过期
        if(empty($token_info['access_expire_time']) || $token_info['access_expire_time'] < time()){
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->app_id&secret=$this->app_secret";
            $res = json_decode($this->http_get($url),true);
            //$res = '{"access_token":"5_PGyp5NcHtq3-McBgMK9p6FFvyEaZBcIutvS80XVQlUWb-6U-gsDmBZaOpw4rFzWTlhjY4YmyqnRVhN-Y1A85bCq-DCDd48hNJ9nkkhJYq7oqGrUeaAq8ZTZ2p6v8qmpgzuBL-v7IqVCe84-rPOWbBGAIHP","expires_in":7200}';
            //$res = json_decode($res,true);
            if($res['access_token']){
                $data = array(
                    "access_token"  =>  $res['access_token'],
                    "access_expire_time"    =>  time()+7000
                );
                M('wx_config')->update($data,"id = 1");
                return $res['access_token'];
            }else{
                @file_put_contents(DIR.'/www/log/wxshare_'.date('Ymd'),"获取ACCESS_TOKEN 错误".$res['errmsg'].PHP_EOL, FILE_APPEND);// 根据自己框架写入失败日志
            }

        }else{
            return $token_info['access_token'];
        }
    }

    public function get_jsapi_token()
    {
        $token_info = M('wx_config')->find("id = 1");//根据自己框架封装的查询方法查询微信数据
        $access_token = $this->get_access_token();
        // 判断token 是否过期
        if(empty($token_info['jsapi_token']) || $token_info['jsapi_expire_time'] < time()){
            $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=".$access_token;
            $res = json_decode($this->http_get($url),true);
            //$res = '{"errcode":0,"errmsg":"ok","ticket":"sM4AOVdWfPE4DxkXGEs8VJlw7gitBGlUZ-yanxWxmVRr1ugcM9aUKaXlqFQwFbSum-DA-MeQBestUGwUsgZtJA","expires_in":7200}';
            //$res = json_decode($res,true);
            if($res['errcode'] == 0){
                $data = array(
                    "jsapi_token"  =>  $res['ticket'],
                    "jsapi_expire_time"    =>  time()+7000
                );
                M('wx_config')->update($data,"id = 1");
                return $res['ticket'];
            }else{
                @file_put_contents(DIR.'/www/log/wxshare_'.date('Ymd'),"获取JSAPI_TOKEN 错误".$res['errmsg'].PHP_EOL, FILE_APPEND);// 失败日志
            }
        }else{
            return $token_info['jsapi_token'];
        }
    }

    public function http_get($url)
    {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_TIMEOUT, 500);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, true);
        curl_setopt($curl, CURLOPT_URL, $url);
        $res = curl_exec($curl);
        curl_close($curl);
        return $res;
    }

    public function create_nonceStr($length = 16) {
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
          $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    public function get_sign_package($url) {
        $jsapi_token = $this->get_jsapi_token();
        $timestamp = time();
        $nonceStr = $this->create_nonceStr();
        // 这里参数的顺序要按照 key 值 ASCII 码升序排序
        $string = "jsapi_ticket=".$jsapi_token."&noncestr=$nonceStr&timestamp=$timestamp&url=$url";
        $signature = sha1($string);

        $token_info = M('wx_config')->find("id = 1");//根据自己框架封装的查询方法查询微信数据
        $signPackage = array(
            "access_token"  =>  $token_info['access_token'],
            "jsapi_token"   =>  $token_info['jsapi_token'],
            "appId"     => $this->app_id,
            "nonceStr"  => $nonceStr,
            "timestamp" => $timestamp,
            "url"       => $url,
            "signature" => $signature,
            "rawString" => $string
        );
        return $signPackage;
    }

    public function share_api()
    {
        $postdata = $_REQUEST;
        $signPackage = $this->get_sign_package($postdata['url']);
        $sharedata['title'] = $postdata['title'];
        $sharedata['desc'] = $postdata['desc'];
        $sharedata['link'] = $postdata['url'];
        $sharedata['imgUrl'] = $postdata['imgUrl'];
        $sharedata['share'] = $signPackage;
        echo json_encode($sharedata);
    }
}

因为接口封装之后请求URL地址为当前JS请求时发送，然后根据传参数请求后返回JSON数据处理，利用微信的JS进行后续唤醒操作

微信分享文档：https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421141115