微信自定义分享

1.根据appid和appsecret获取微信AccessToken

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

    $data = json_decode($this->get_php_file("access_token.php"));

    if ($data->expire_time < time()) {

        // 如果是企业号用以下URL获取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->expire_time = time() + 7000;

            $data->access_token = $access_token;

            $this->set_php_file("access_token.php", json_encode($data));

        }

    } else {

        $access_token = $data->access_token;

    }

    return $access_token;

}

2.根据AccessToken获取JsApiTicket

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

    $data = json_decode($this->get_php_file("jsapi_ticket.php"));

    if ($data->expire_time < time()) {

        $accessToken = $this->getAccessToken();

        // 如果是企业号用以下 URL 获取 ticket

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

        $res = json_decode($this->httpGet($url));

        $ticket = $res->ticket;

        if ($ticket) {

            $data->expire_time = time() + 7000;

            $data->jsapi_ticket = $ticket;

            $this->set_php_file("jsapi_ticket.php", json_encode($data));

        }

    } else {

        $ticket = $data->jsapi_ticket;

    }

    return $ticket;

}

3.根据相关参数生成签名参数，返回到前端

public function getSignPackage() {

        $url = urldecode($_REQUEST['url']);

        $jsapiTicket = $this->getJsApiTicket();

        // 注意 URL 一定要动态获取，不能 hardcode.

        $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

        );

        $this->apiReturn(array("data" => $signPackage));

    }

4-1.发送请求

private function httpGet($url) {


    $curl = curl_init();

    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

    curl_setopt($curl, CURLOPT_TIMEOUT, 500);

    // 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。

// 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。

    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;

}

4-2.获取文件

private function get_php_file($filename) {

    return trim(substr(file_get_contents($filename), 15));

}

4-3.设置文件

private function set_php_file($filename, $content) {

    $fp = fopen($filename, "w");

    fwrite($fp, "<?php exit();?>" . $content);

    fclose($fp);

}

4-4.生成随机字符串

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;

}

5.注意事项

1   url必须是分享页包括参数，最好前端传过来