微信sdk 签名

<?php
namespace appwechatservice;
use thinkConfig;
class Signature
{    
    protected $appId ;
    protected $appSecret;
    protected $path;

    public function __construct($type='service') {

        $this->appId      = Config::get('wx_'.$type.'.appId');
        $this->appSecret = Config::get('wx_'.$type.'.appSecret');
        $this->path      = Config::get('wx_'.$type.'.fileUrl');
    }
    public function getSignPackage() {

        $jsapiTicket = $this->getJsApiTicket();
        $url = urldecode($_GET['sign_url']);
        $timestamp = time();
        $nonceStr = get_rand_str(16, 0, 1, 0);
        // 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 getJsApiTicket() {

        $JsApiTicket = $this->path . "JsApiTicket_pssh.json";//缓存文件名
        !is_file($JsApiTicket) && touch($JsApiTicket, '777');
        $data = json_decode(file_get_contents($JsApiTicket), true);
        if ($data['expire_time'] < time() or !$data['expire_time']) {
            $accessToken = $this->access_Token();
            $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
            $res = json_decode(httpRequest($url, 'GET'), true);
            $ticket = $res['ticket'];
            if ($ticket) {
                $data['expire_time'] = time() + 7000;
                $data['jsapi_ticket'] = $ticket;
                $fp = fopen($JsApiTicket, "w+");
                fwrite($fp, json_encode($data));
                fclose($fp);
            }
        } else {
            $ticket = $data['jsapi_ticket'];
        }
        return $ticket;
    }

    public function access_Token() {

        $tokenFile = $this->path . "accessToken_pssh.json";//缓存文件名
        !is_file($tokenFile) && touch($tokenFile, '777');
        $data = json_decode(file_get_contents($tokenFile), true);
        if ($data['expire_time'] < time() or !$data['expire_time']) {
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appId=".$this->appId."&secret=".$this->appSecret;
            $res = httpRequest($url, 'GET');
            $res = json_decode($res,true);
            $access_token = $res['access_token'];
            if($access_token) {
                $data['expire_time'] = time() + 7000;
                $data['access_token'] = $access_token;
                $fp = fopen($tokenFile, "w");
                fwrite($fp, json_encode($data));
                fclose($fp);
            }
        } else {
            $access_token = $data['access_token'];
        }
        return $access_token;
    }

}

使用 （上面的配置文件根据自己的需要写）

public function getSignPackage()
    {
        $sign = new SignatureService('service');
        $result = $sign->getSignPackage();
        return json($result);
    }

这是基于TP5写的  自己记录用  要是能看懂就拿走 

SignatureService（）方法里面的参数是区分不同公众号 这样也要有不同的配置文件

function share_disable(){
        $.ajax({
            type: 'GET',
            url: localurl + "/index.php/……/getSignPackage",
            data: {sign_url:encodeURIComponent(location.href.split('#')[0])},
            dataType: 'JSON',
            success: function(data){

                wx.config({
                // debug :true,
                appId: data.appId,
                timestamp: data.timestamp,
                nonceStr: data.nonceStr,
                signature: data.signature,
                jsApiList: [
                "hideMenuItems"
                ]
            });
                wx.ready(function () {
                    wx.hideMenuItems({
                        menuList: [ 
                        "menuItem:share:qq",
                        "menuItem:share:timeline",
                        "menuItem:share:appMessage",
                        "menuItem:share:QZone",
                        "menuItem:share:weiboApp",
                        "menuItem:favorite",
                        "menuItem:share:facebook",
                        "menuItem:copyUrl",
                        "menuItem:openWithQQBrowser",
                        "menuItem:share:email",
                        "menuItem:openWithSafari",
                        "menuItem:originPage"
                            ] // 要隐藏的菜单项，只能隐藏“传播类”和“保护类”按钮，所有menu项见附录3
                        });
                }); 
            }
        });

    }

这是隐藏分享按钮的示例