class weixin{
	//1.檢測是否微信瀏覽器
	function isWeiXinBrowser() {
		$agent = $_SERVER ['HTTP_USER_AGENT'];
		if (!strpos($agent, "icroMessenger")){
			return false;
		}
		return true;
	}

	//1.獲取微信code
	function get_wx_code($redirect_url,$type='base',$parameter=''){
		$redirect_url =urlencode($redirect_url);
		//1基本資訊,其它需要授權，更多高階資訊
		$scope = $type == 'base' ? 'snsapi_base' : 'snsapi_userinfo';
		//重定向後會帶上state引數，開發者可以填寫a-zA-Z0-9的引數值，最多128位元組
	   
		//進行重定向操作
		$get_url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid='.WX_APPID.'&redirect_uri='.$redirect_url.'&response_type=code&scope='.$scope.'&state='.$parameter;
		header("Location:".$get_url);
		die();
	}

	//2.獲取微信access_token,如果是第一次獲取，則需要傳送_code,否則是從快取中獲取
	function get_wx_access_token($code){
		$get_url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.WX_APPID.'&secret='.WX_APPSECRET.'&code='.$code.'&grant_type=authorization_code';
		$response=$this->curl_get($get_url);
		$res_arr=json_decode($response,true);
		return $res_arr;
	}
	
	//2.1
	function get_public_access_token()
	{
		$memcache = new Memcache;
		global $CFG;
		$memcache->connect($CFG['memcache_host'], $CFG['memcache_port']) or die('err_');
		$weixin_access_token='';
		$weixin_access_token_key="weixin_access_token";
		if($memcache->get($weixin_access_token_key))
		{
			$weixin_access_token=$memcache->get($weixin_access_token_key);
		}
		else
		{
			$get_url='https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid='.WX_APPID.'&secret='.WX_APPSECRET;
			$response=$this->curl_post($get_url);
			$res_arr=json_decode($response,true);
			if(isset($res_arr['access_token']) && isset($res_arr['expires_in']))
			{
				$weixin_access_token=$res_arr['access_token'];
				$memcache->set($weixin_access_token_key,$res_arr['access_token'],false,$res_arr['expires_in']);
			}
			

		}
		$memcache->close();
		return $weixin_access_token;
	}
	
	//2.2.
	function get_wx_userinfo($access_token,$openid)
	{
		$get_url='https://api.weixin.qq.com/cgi-bin/user/info?ACCESS_TOKEN='.$access_token.'&OPENID='.$openid;
		$response=$this->curl_post($get_url);
		$res_arr=json_decode($response,true);
		return $res_arr;
	}
	/**
     * 會員提現
     * @param string $openid 	使用者openID
     * @param string $trade_no 	單號
     * @param string $money 	金額
     * @param string $desc 		描述
     * @return string XML 		結構的字串
     */
	function company_pay_member($openid,$trade_no,$money,$desc){
		global $DT_IP;
		$url = 'https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers';
		$data = array(
			'mch_appid' => WX_OPEN_APPID,
            'mchid'     => WX_MCHID,
            'nonce_str' => random(32),
            'partner_trade_no' => $trade_no, //商戶訂單號，需要唯一
            'openid'    => $openid,
            'check_name'=> 'NO_CHECK', //NO_CHECK不強制校驗真實姓名, FORCE_CHECK：強制
            //'re_user_name' => 'jorsh', //收款人姓名
            'amount'    => $money * 100, //付款金額單位為分
            'desc'      => $desc,
            'spbill_create_ip' => $DT_IP
		);
		$data['sign'] = $this->makeSign($data);
		$xmldata = $this->array2xml($data);
        $res = $this->curl_post($url,$xmldata,true);
		
		$tag=array('status'=>0,'msg'=>'Can t connect the server');
		if(!$res){return $tag;}

		//file_put_contents('D:\EmpireServer\web\info.log',$res,FILE_APPEND);
        $res_arr = $this->xml2array($res);
		if($res_arr['return_code']=='SUCCESS' && $res_arr['result_code']=='SUCCESS')
		{
			$tag['status']=1;
			$tag['res_arr']=$res_arr;
		}
		else
		{
			if(strval($res_arr['return_code']) == 'FAIL'){
				$tag['msg']=strval($res_arr['return_msg']);
				return $tag;
			}
			if(strval($res_arr['result_code']) == 'FAIL'){
				$tag['msg']=strval($res_arr['err_code_des']);
				return $tag;
			}
		}
        return $tag;
	}
	
    //將一個數組轉換為 XML 結構的字串
    function array2xml($arr, $level = 1) {
        $s = $level == 1 ? "<xml>" : '';
        foreach($arr as $tagname => $value) {
            if (is_numeric($tagname)) {
                $tagname = $value['TagName'];
                unset($value['TagName']);
            }
            if(!is_array($value)) {
                $s .= "<{$tagname}>".$value."</{$tagname}>";
            } else {
                $s .= "<{$tagname}>" . $this->array2xml($value, $level + 1)."</{$tagname}>";
            }
        }
        $s = preg_replace("/([\x01-\x08\x0b-\x0c\x0e-\x1f])+/", ' ', $s);
        return $level == 1 ? $s."</xml>" : $s;
    }
	
	//將xml轉為array
	function xml2array($xml){   
		//禁止引用外部xml實體
		libxml_disable_entity_loader(true);
		$result= json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);        
		return $result;
	}	
	
	//生成簽名
	function makeSign($data){
		$data=array_filter($data);
		ksort($data);
		$str=urldecode(http_build_query($data));
		$sign = strtoupper(md5($str."&key=".WX_APPKEY));
		return $sign;
	}
	
	//crul請求
	function curl_post($url,$xmldata='',$cert=false){
		$curl = curl_init();
		curl_setopt($curl,CURLOPT_TIMEOUT,30);
		curl_setopt($curl,CURLOPT_RETURNTRANSFER, true);
		curl_setopt($curl,CURLOPT_URL,$url);
		curl_setopt($curl,CURLOPT_SSL_VERIFYPEER,false);
		curl_setopt($curl,CURLOPT_SSL_VERIFYHOST,false);
		curl_setopt($curl,CURLOPT_POST,true);
		if($cert)
		{
			curl_setopt($curl,CURLOPT_SSLCERTTYPE,'PEM');
			curl_setopt($curl,CURLOPT_SSLCERT,WX_API_CERT);
			curl_setopt($curl,CURLOPT_SSLKEYTYPE,'PEM');
			curl_setopt($curl,CURLOPT_SSLKEY,WX_API_KEY);
		}
		if($xmldata)
		{
			curl_setopt($curl,CURLOPT_POSTFIELDS,$xmldata);
		}
		$res = curl_exec($curl);
    	curl_close($curl);
   		return $res;
	}
	//crul請求
	function curl_get($url){
		$curl = curl_init();
		curl_setopt($curl,CURLOPT_TIMEOUT,30);
		curl_setopt($curl,CURLOPT_RETURNTRANSFER, true);
		curl_setopt($curl,CURLOPT_URL,$url);
		curl_setopt($curl,CURLOPT_SSL_VERIFYPEER,false);
		curl_setopt($curl,CURLOPT_SSL_VERIFYHOST,false);
		curl_setopt($curl,CURLOPT_POST,false);
		$res = curl_exec($curl);
    	        curl_close($curl);
   		return $res;
	}
	
}