记微信小程序接口类（包含Unionid直播二维码汇率换算等）

<?php
namespace Wxapp;
class Wxapp
{
    const API_URL_PREFIX = 'https://api.weixin.qq.com';
    const AUTH_ORIZATION = '/sns/jscode2session?';
    const GET_ACCESS_TOKEN = '/cgi-bin/token?';
    const GET_USER_INFO = '/cgi-bin/user/info?';
    const GET_WXA_CODE = '/wxa/getwxacode?';
    const GET_WXA_CODE_UNLIMIT = '/wxa/getwxacodeunlimit?';
    const GET_WXA_QRCODE = '/cgi-bin/wxaapp/createwxaqrcode?';
    const GET_WXA_KEYWORD_LIST = '/cgi-bin/wxopen/template/library/get?';
    const GET_WXA_TEMPLATE_ADD = '/cgi-bin/wxopen/template/add?';
    const GET_WXA_TEMPLATE_DEL = '/cgi-bin/wxopen/template/del?';
    const GET_WXA_TEMPLATE_SEND_URL = '/cgi-bin/message/wxopen/template/send?';
    const GET_LIVE_INFO_URL = '/wxa/business/getliveinfo?access_token=';
    const GET_EXCH_URL = 'https://api.mch.weixin.qq.com/pay/queryexchagerate';

    private $wx_mini_appid;
    private $wx_mini_secret;
    private $mch_id;
    private $mch_key;
    public $debug = false;
    public $errCode = 40001;
    public $errMsg = 'no access';

    public function __construct(array $options)
    {
        $this->wx_mini_appid = isset($options['appid']) ? $options['appid'] : '';
        $this->wx_mini_secret = isset($options['secret']) ? $options['secret'] : '';
        $this->mch_id = isset($options['mch_id']) ? $options['mch_id'] : '';
        $this->mch_key = isset($options['mch_key']) ? $options['mch_key'] : '';
    }

    public function getOauthOrization($code)
    {
        $params = array('appid' => $this->wx_mini_appid, 'secret' => $this->wx_mini_secret, 'js_code' => $code, 'grant_type' => 'authorization_code');
        $result = $this->curlGet(self::API_URL_PREFIX . self::AUTH_ORIZATION . http_build_query($params, '', '&'));

        if ($result) {
            $json = json_decode($result, true);
            if (!$json || !empty($json['errcode'])) {
                $this->errCode = $json['errcode'];
                $this->errMsg = $json['errmsg'];
                return false;
            }

            return $json;
        }

        return false;
    }

    public function getUnionid($token, $openid)
    {
        $params = array('withCredentials' => true, 'access_token' => $token, 'openid' => $openid, 'lang' => 'zh_CN');
        $result = $this->curlPost(self::API_URL_PREFIX . self::GET_USER_INFO, self::json_encode($params));

        if ($result) {
            $json = json_decode($result, true);
            if (!$json || !empty($json['errcode'])) {
                $this->errCode = $json['errcode'];
                $this->errMsg = $json['errmsg'];
                return false;
            }

            return $json;
        }

        return false;
    }

    public function getAccessToken()
    {
        $result = $this->curlGet(self::API_URL_PREFIX . self::GET_ACCESS_TOKEN . 'grant_type=client_credential&appid=' . $this->wx_mini_appid . '&secret=' . $this->wx_mini_secret);

        if ($result) {
            $json = json_decode($result, true);
            if (!$json || !empty($json['errcode'])) {
                $this->errCode = $json['errcode'];
                $this->errMsg = $json['errmsg'];
                return false;
            }

            return $json['access_token'];
        }

        return false;
    }

    public function getWaCode($path, $width = '430', $auto_color = true, $line_color = '')
    {
        $data = array('path' => $path, 'width' => $width, 'auto_color' => $auto_color, 'line_color' => $line_color);

        if ($auto_color === false) {
            unset($data['line_color']);
        }

        $result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_CODE . 'access_token=' . self::getAccessToken(), self::json_encode($data));
        return $result;
    }

    public function getWaCodeUnlimit($scene = '', $path, $width, $auto_color = false, $line_color = '')
    {
        $data = array('scene' => $scene, 'page' => $path, 'width' => $width, 'auto_color' => $auto_color, 'line_color' => $line_color);

        if ($auto_color === false) {
            unset($data['line_color']);
        }

        $result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_CODE_UNLIMIT . 'access_token=' . self::getAccessToken(), self::json_encode($data));
        return $result;
    }

    public function getWxaCode($path, $width = '430')
    {
        $data = array('path' => $path, 'width' => $width);
        $result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_QRCODE . 'access_token=' . self::getAccessToken(), self::json_encode($data));
        return $result;
    }

    public function getWxTemplateKeywordList($tpl_id)
    {
        $tpl_id = array('id' => $tpl_id);
        $result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_KEYWORD_LIST . 'access_token=' . self::getAccessToken(), self::json_encode($tpl_id));
        return json_decode($result, true);
    }

    public function wxaddTemplateMessage($tpl_id, $keyword_id)
    {
        $tpl_id = array('id' => $tpl_id, 'keyword_id_list' => $keyword_id);
        $result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_TEMPLATE_ADD . 'access_token=' . self::getAccessToken(), self::json_encode($tpl_id));

        if ($result) {
            $json = json_decode($result, true);
            if (!$json || !empty($json['errcode'])) {
                $this->errCode = $json['errcode'];
                $this->errMsg = $json['errmsg'];
                return false;
            }

            return $json['template_id'];
        }

        return false;
    }

    public function wxDelTemplate($template_id)
    {
        $data = array('template_id' => $template_id);
        $result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_TEMPLATE_DEL . 'access_token=' . self::getAccessToken(), self::json_encode($data));

        if ($result) {
            $json = json_decode($result, true);
            if (!$json || !empty($json['errcode'])) {
                $this->errCode = $json['errcode'];
                $this->errMsg = $json['errmsg'];
                return false;
            }

            return $json;
        }

        return false;
    }

    public function getLiveList(){
        $token = self::getAccessToken();
        $result = $this->curlPost(self::API_URL_PREFIX . self::GET_LIVE_INFO_URL . $token, self::json_encode(['start'=> 0, 'limit' => 20]));
        if ($result) {
            $json = json_decode($result, true);
            if (!$json || !empty($json['errcode'])) {
                $this->errCode = $json['errcode'];
                $this->errMsg = $json['errmsg'];
                return false;
            }
            return $json;
        }
    }

    public function getLiveBackVideoList($roomId, $start, $limit){
        $token = self::getAccessToken();
        $result = $this->curlPost(self::API_URL_PREFIX . self::GET_LIVE_INFO_URL . $token, self::json_encode(['room_id' => $roomId, 'start'=> $start, 'limit' => $limit, 'action' => 'get_replay']));
        if ($result) {
            $json = json_decode($result, true);
            if (!$json || !empty($json['errcode'])) {
                $this->errCode = $json['errcode'];
                $this->errMsg = $json['errmsg'];
                return false;
            }
            return $json;
        }
    }

    public function sendTemplateMessage($data)
    {
        $result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_TEMPLATE_SEND_URL . 'access_token=' . self::getAccessToken(), self::json_encode($data));

        if ($result) {
            $json = json_decode($result, true);
            if (!$json || !empty($json['errcode'])) {
                $this->errCode = $json['errcode'];
                $this->errMsg = $json['errmsg'];
                return false;
            }

            return $json;
        }

        return false;
    }

    protected function curlGet($url, $timeout = 5, $header = '')
    {
        $ch = curl_init();

        if (stripos($url, 'https://') !== false) {
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
            curl_setopt($ch, CURLOPT_SSLVERSION, 1);
        }

        curl_setopt($ch, CURLOPT_HTTP_VERSION, 1);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array($header));
        $result = curl_exec($ch);
        $aStatus = curl_getinfo($ch);
        curl_close($ch);

        if (intval($aStatus['http_code']) == 200) {
            return $result;
        }
        else {
            return false;
        }
    }

    protected function curlPost($url, $post_data, $timeout = 5)
    {
        $ch = curl_init();

        if (stripos($url, 'https://') !== false) {
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
            curl_setopt($ch, CURLOPT_SSLVERSION, 1);
        }

        $header = empty($header) ? '' : $header;

        if (is_string($post_data)) {
            $strPOST = $post_data;
        }
        else {
            $aPOST = array();

            foreach ($post_data as $key => $val) {
                $aPOST[] = $key . '=' . urlencode($val);
            }

            $strPOST = join('&', $aPOST);
        }

        curl_setopt($ch, CURLOPT_HTTP_VERSION, 1);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $strPOST);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        $result = curl_exec($ch);
        $aStatus = curl_getinfo($ch);
        curl_close($ch);

        if (intval($aStatus['http_code']) == 200) {
            return $result;
        }
        else {
            return false;
        }
    }

    static public function json_encode($arr)
    {
        if (count($arr) == 0) {
            return '[]';
        }

        $parts = array();
        $is_list = false;
        $keys = array_keys($arr);
        $max_length = count($arr) - 1;
        if ($keys[0] === 0 && $keys[$max_length] === $max_length) {
            $is_list = true;

            for ($i = 0; $i < count($keys); $i++) {
                if ($i != $keys[$i]) {
                    $is_list = false;
                    break;
                }
            }
        }

        foreach ($arr as $key => $value) {
            if (is_array($value)) {
                if ($is_list) {
                    $parts[] = self::json_encode($value);
                }
                else {
                    $parts[] = '"' . $key . '":' . self::json_encode($value);
                }
            }
            else {
                $str = '';

                if (!$is_list) {
                    $str = '"' . $key . '":';
                }

                if (!is_string($value) && is_numeric($value) && $value < 2000000000) {
                    $str .= $value;
                }
                else if ($value === false) {
                    $str .= 'false';
                }
                else if ($value === true) {
                    $str .= 'true';
                }
                else {
                    $str .= '"' . addslashes($value) . '"';
                }

                $parts[] = $str;
            }
        }

        $json = implode(',', $parts);

        if ($is_list) {
            return '[' . $json . ']';
        }

        return '{' . $json . '}';
    }

    public function log($log)
    {
        $log = is_array($log) ? var_export($log, true) : $log;
        if ($this->debug && function_exists('logResult')) {
            logResult($log);
        }
    }

    protected function setCache($cachename, $value, $expired)
    {
        return S($cachename, $value, $expired);
    }

    protected function getCache($cachename)
    {
        return S($cachename);
    }

    protected function removeCache($cachename)
    {
        return S($cachename, null);
    }
    
    /*汇率查询*/
    public function getExchange($fee_type){

        $data['appid'] = $this->wx_mini_appid;
        $data['mch_id'] = $this->mch_id;
        $data['fee_type'] = $fee_type;
        $data['date'] = date('Ymd');
        
        $data['sign'] = $this->makeSign($data);

        $result = $this->curlPost(self::GET_EXCH_URL,$this->toXml($data));
        
//         var_dump($result);
        return $this->fromXml($result);
    }    
    
    /**
     * 生成签名
     * @param $values
     * @return string 本函数不覆盖sign成员变量，如要设置签名需要调用SetSign方法赋值
     */
    private function makeSign($values)
    {
        //签名步骤一：按字典序排序参数
        ksort($values);
        $string = $this->toUrlParams($values);
        //签名步骤二：在string后加入KEY
        $string = $string . '&key=' . $this->mch_key;
        // var_dump($string);
        //签名步骤三：MD5加密
        $string = md5($string);
        
        //签名步骤四：所有字符转为大写
        $result = strtoupper($string);
        return $result;
    }    
    /**
     * 格式化参数格式化成url参数
     * @param $values
     * @return string
     */
    private function toUrlParams($values)
    {
        $buff = '';
        foreach ($values as $k => $v) {
            if ($k != 'sign' && $v != '' && !is_array($v)) {
                $buff .= $k . '=' . $v . '&';
            }
        }
        return trim($buff, '&');
    }    
    /**
     * 输出xml字符
     * @param $values
     * @return bool|string
     */
    private function toXml($values)
    {
        if (!is_array($values)
            || count($values) <= 0
        ) {
            return false;
        }
        $xml = "<xml>";
        foreach ($values as $key => $val) {
            if (is_numeric($val)) {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
            }
        }
        $xml .= "</xml>";
        return $xml;
    }    
    /**
     * 将xml转为array
     * @param $xml
     * @return mixed
     */
    private function fromXml($xml)
    {
        // 禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        return json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
    }    
}


?>

<?phpnamespace Wxapp;class Wxapp{const API_URL_PREFIX = 'https://api.weixin.qq.com';const AUTH_ORIZATION = '/sns/jscode2session?';const GET_ACCESS_TOKEN = '/cgi-bin/token?';const GET_USER_INFO = '/cgi-bin/user/info?';const GET_WXA_CODE = '/wxa/getwxacode?';const GET_WXA_CODE_UNLIMIT = '/wxa/getwxacodeunlimit?';const GET_WXA_QRCODE = '/cgi-bin/wxaapp/createwxaqrcode?';const GET_WXA_KEYWORD_LIST = '/cgi-bin/wxopen/template/library/get?';const GET_WXA_TEMPLATE_ADD = '/cgi-bin/wxopen/template/add?';const GET_WXA_TEMPLATE_DEL = '/cgi-bin/wxopen/template/del?';const GET_WXA_TEMPLATE_SEND_URL = '/cgi-bin/message/wxopen/template/send?';const GET_LIVE_INFO_URL = '/wxa/business/getliveinfo?access_token=';const GET_EXCH_URL = 'https://api.mch.weixin.qq.com/pay/queryexchagerate';
private $wx_mini_appid;private $wx_mini_secret;private $mch_id;private $mch_key;public $debug = false;public $errCode = 40001;public $errMsg = 'no access';
public function __construct(array $options){$this->wx_mini_appid = isset($options['appid']) ? $options['appid'] : '';$this->wx_mini_secret = isset($options['secret']) ? $options['secret'] : '';$this->mch_id = isset($options['mch_id']) ? $options['mch_id'] : '';$this->mch_key = isset($options['mch_key']) ? $options['mch_key'] : '';}
public function getOauthOrization($code){$params = array('appid' => $this->wx_mini_appid, 'secret' => $this->wx_mini_secret, 'js_code' => $code, 'grant_type' => 'authorization_code');$result = $this->curlGet(self::API_URL_PREFIX . self::AUTH_ORIZATION . http_build_query($params, '', '&'));
if ($result) {$json = json_decode($result, true);if (!$json || !empty($json['errcode'])) {$this->errCode = $json['errcode'];$this->errMsg = $json['errmsg'];return false;}
return $json;}
return false;}
public function getUnionid($token, $openid){$params = array('withCredentials' => true, 'access_token' => $token, 'openid' => $openid, 'lang' => 'zh_CN');$result = $this->curlPost(self::API_URL_PREFIX . self::GET_USER_INFO, self::json_encode($params));
if ($result) {$json = json_decode($result, true);if (!$json || !empty($json['errcode'])) {$this->errCode = $json['errcode'];$this->errMsg = $json['errmsg'];return false;}
return $json;}
return false;}
public function getAccessToken(){$result = $this->curlGet(self::API_URL_PREFIX . self::GET_ACCESS_TOKEN . 'grant_type=client_credential&appid=' . $this->wx_mini_appid . '&secret=' . $this->wx_mini_secret);
if ($result) {$json = json_decode($result, true);if (!$json || !empty($json['errcode'])) {$this->errCode = $json['errcode'];$this->errMsg = $json['errmsg'];return false;}
return $json['access_token'];}
return false;}
public function getWaCode($path, $width = '430', $auto_color = true, $line_color = ''){$data = array('path' => $path, 'width' => $width, 'auto_color' => $auto_color, 'line_color' => $line_color);
if ($auto_color === false) {unset($data['line_color']);}
$result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_CODE . 'access_token=' . self::getAccessToken(), self::json_encode($data));return $result;}
public function getWaCodeUnlimit($scene = '', $path, $width, $auto_color = false, $line_color = ''){$data = array('scene' => $scene, 'page' => $path, 'width' => $width, 'auto_color' => $auto_color, 'line_color' => $line_color);
if ($auto_color === false) {unset($data['line_color']);}
$result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_CODE_UNLIMIT . 'access_token=' . self::getAccessToken(), self::json_encode($data));return $result;}
public function getWxaCode($path, $width = '430'){$data = array('path' => $path, 'width' => $width);$result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_QRCODE . 'access_token=' . self::getAccessToken(), self::json_encode($data));return $result;}
public function getWxTemplateKeywordList($tpl_id){$tpl_id = array('id' => $tpl_id);$result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_KEYWORD_LIST . 'access_token=' . self::getAccessToken(), self::json_encode($tpl_id));return json_decode($result, true);}
public function wxaddTemplateMessage($tpl_id, $keyword_id){$tpl_id = array('id' => $tpl_id, 'keyword_id_list' => $keyword_id);$result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_TEMPLATE_ADD . 'access_token=' . self::getAccessToken(), self::json_encode($tpl_id));
if ($result) {$json = json_decode($result, true);if (!$json || !empty($json['errcode'])) {$this->errCode = $json['errcode'];$this->errMsg = $json['errmsg'];return false;}
return $json['template_id'];}
return false;}
public function wxDelTemplate($template_id){$data = array('template_id' => $template_id);$result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_TEMPLATE_DEL . 'access_token=' . self::getAccessToken(), self::json_encode($data));
if ($result) {$json = json_decode($result, true);if (!$json || !empty($json['errcode'])) {$this->errCode = $json['errcode'];$this->errMsg = $json['errmsg'];return false;}
return $json;}
return false;}
public function getLiveList(){$token = self::getAccessToken();$result = $this->curlPost(self::API_URL_PREFIX . self::GET_LIVE_INFO_URL . $token, self::json_encode(['start'=> 0, 'limit' => 20]));if ($result) {$json = json_decode($result, true);if (!$json || !empty($json['errcode'])) {$this->errCode = $json['errcode'];$this->errMsg = $json['errmsg'];return false;}return $json;}}
public function getLiveBackVideoList($roomId, $start, $limit){$token = self::getAccessToken();$result = $this->curlPost(self::API_URL_PREFIX . self::GET_LIVE_INFO_URL . $token, self::json_encode(['room_id' => $roomId, 'start'=> $start, 'limit' => $limit, 'action' => 'get_replay']));if ($result) {$json = json_decode($result, true);if (!$json || !empty($json['errcode'])) {$this->errCode = $json['errcode'];$this->errMsg = $json['errmsg'];return false;}return $json;}}
public function sendTemplateMessage($data){$result = $this->curlPost(self::API_URL_PREFIX . self::GET_WXA_TEMPLATE_SEND_URL . 'access_token=' . self::getAccessToken(), self::json_encode($data));
if ($result) {$json = json_decode($result, true);if (!$json || !empty($json['errcode'])) {$this->errCode = $json['errcode'];$this->errMsg = $json['errmsg'];return false;}
return $json;}
return false;}
protected function curlGet($url, $timeout = 5, $header = ''){$ch = curl_init();
if (stripos($url, 'https://') !== false) {curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);curl_setopt($ch, CURLOPT_SSLVERSION, 1);}
curl_setopt($ch, CURLOPT_HTTP_VERSION, 1);curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);curl_setopt($ch, CURLOPT_HTTPHEADER, array($header));$result = curl_exec($ch);$aStatus = curl_getinfo($ch);curl_close($ch);
if (intval($aStatus['http_code']) == 200) {return $result;}else {return false;}}
protected function curlPost($url, $post_data, $timeout = 5){$ch = curl_init();
if (stripos($url, 'https://') !== false) {curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);curl_setopt($ch, CURLOPT_SSLVERSION, 1);}
$header = empty($header) ? '' : $header;
if (is_string($post_data)) {$strPOST = $post_data;}else {$aPOST = array();
foreach ($post_data as $key => $val) {$aPOST[] = $key . '=' . urlencode($val);}
$strPOST = join('&', $aPOST);}
curl_setopt($ch, CURLOPT_HTTP_VERSION, 1);curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);curl_setopt($ch, CURLOPT_POST, true);curl_setopt($ch, CURLOPT_POSTFIELDS, $strPOST);curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);$result = curl_exec($ch);$aStatus = curl_getinfo($ch);curl_close($ch);
if (intval($aStatus['http_code']) == 200) {return $result;}else {return false;}}
static public function json_encode($arr){if (count($arr) == 0) {return '[]';}
$parts = array();$is_list = false;$keys = array_keys($arr);$max_length = count($arr) - 1;if ($keys[0] === 0 && $keys[$max_length] === $max_length) {$is_list = true;
for ($i = 0; $i < count($keys); $i++) {if ($i != $keys[$i]) {$is_list = false;break;}}}
foreach ($arr as $key => $value) {if (is_array($value)) {if ($is_list) {$parts[] = self::json_encode($value);}else {$parts[] = '"' . $key . '":' . self::json_encode($value);}}else {$str = '';
if (!$is_list) {$str = '"' . $key . '":';}
if (!is_string($value) && is_numeric($value) && $value < 2000000000) {$str .= $value;}else if ($value === false) {$str .= 'false';}else if ($value === true) {$str .= 'true';}else {$str .= '"' . addslashes($value) . '"';}
$parts[] = $str;}}
$json = implode(',', $parts);
if ($is_list) {return '[' . $json . ']';}
return '{' . $json . '}';}
public function log($log){$log = is_array($log) ? var_export($log, true) : $log;if ($this->debug && function_exists('logResult')) {logResult($log);}}
protected function setCache($cachename, $value, $expired){return S($cachename, $value, $expired);}
protected function getCache($cachename){return S($cachename);}
protected function removeCache($cachename){return S($cachename, null);}/*汇率查询*/    public function getExchange($fee_type){
        $data['appid'] = $this->wx_mini_appid;        $data['mch_id'] = $this->mch_id;        $data['fee_type'] = $fee_type;        $data['date'] = date('Ymd');                $data['sign'] = $this->makeSign($data);
$result = $this->curlPost(self::GET_EXCH_URL,$this->toXml($data));// var_dump($result);return $this->fromXml($result);    }    /**     * 生成签名     * @param $values     * @return string 本函数不覆盖sign成员变量，如要设置签名需要调用SetSign方法赋值     */    private function makeSign($values)    {        //签名步骤一：按字典序排序参数        ksort($values);        $string = $this->toUrlParams($values);        //签名步骤二：在string后加入KEY        $string = $string . '&key=' . $this->mch_key;        // var_dump($string);        //签名步骤三：MD5加密        $string = md5($string);                //签名步骤四：所有字符转为大写        $result = strtoupper($string);        return $result;    }    /**     * 格式化参数格式化成url参数     * @param $values     * @return string     */    private function toUrlParams($values)    {        $buff = '';        foreach ($values as $k => $v) {            if ($k != 'sign' && $v != '' && !is_array($v)) {                $buff .= $k . '=' . $v . '&';            }        }        return trim($buff, '&');    }        /**     * 输出xml字符     * @param $values     * @return bool|string     */    private function toXml($values)    {        if (!is_array($values)            || count($values) <= 0        ) {            return false;        }        $xml = "<xml>";        foreach ($values as $key => $val) {            if (is_numeric($val)) {                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";            } else {                $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";            }        }        $xml .= "</xml>";        return $xml;    }        /**     * 将xml转为array     * @param $xml     * @return mixed     */    private function fromXml($xml)    {        // 禁止引用外部xml实体        libxml_disable_entity_loader(true);        return json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);    }    }

?>