CI框架集成微信APP支付

<?phpclass Wxpay{//接口API URL前缀const API_URL_PREFIX = 'https://api.mch.weixin.qq.com';//下单地址URLconst UNIFIEDORDER_URL = "/pay/unifiedorder";//查询订单URLconst ORDERQUERY_URL = "/pay/orderquery";//关闭订单URLconst CLOSEORDER_URL = "/pay/closeorder";//商户号private $mch_id;//随机字符串private $nonce_str;//签名private $sign;//商品描述private $body;//商户订单号private $out_trade_no;//支付总金额private $total_fee;//终端IPprivate $spbill_create_ip;//支付结果回调通知地址private $notify_url;//交易类型private $trade_type;//支付密钥private $key;//证书路径private $SSLCERT_PATH;private $SSLKEY_PATH;//所有参数private $params = array();public function __construct(){    $this->CI = & get_instance();    $this->CI->config->load('wxpay');    $this->wxpay_config = $this->CI->config->item('wxpay');    $this->appid = $this->wxpay_config['APPID'];    $this->mch_id = $this->wxpay_config['MCHID'];    $this->notify_url = $this->wxpay_config['WE_NOTIFY_URL'];    $this->key = $this->wxpay_config['APP_KEY'];}/*** 下单方法* @param   $params 下单参数*/public function unifiedOrder( $params ){$this->body = $params['body'];$this->out_trade_no = $params['out_trade_no'];$this->total_fee = $params['total_fee'];$this->trade_type = $params['trade_type'];$this->nonce_str = $this->genRandomString();$this->spbill_create_ip = $_SERVER['REMOTE_ADDR'];$this->params['appid'] = $this->appid;$this->params['mch_id'] = $this->mch_id;$this->params['nonce_str'] = $this->nonce_str;$this->params['body'] = $this->body;$this->params['out_trade_no'] = $this->out_trade_no;$this->params['total_fee'] = $this->total_fee;$this->params['spbill_create_ip'] = $this->spbill_create_ip;$this->params['notify_url'] = $this->notify_url;$this->params['trade_type'] = $this->trade_type;//获取签名数据$this->sign = $this->MakeSign( $this->params );$this->params['sign'] = $this->sign;$xml = $this->data_to_xml($this->params);$response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::UNIFIEDORDER_URL);if( !$response ){return false;}$result = $this->xml_to_data( $response );if( !empty($result['result_code']) && !empty($result['err_code']) ){$result['err_msg'] = $this->error_code( $result['err_code'] );}return $result;}/*** 查询订单信息* @param $out_trade_no     订单号* @return array*/public function orderQuery( $out_trade_no ){$this->params['appid'] = $this->appid;$this->params['mch_id'] = $this->mch_id;$this->params['nonce_str'] = $this->genRandomString();$this->params['out_trade_no'] = $out_trade_no;//获取签名数据$this->sign = $this->MakeSign( $this->params );$this->params['sign'] = $this->sign;$xml = $this->data_to_xml($this->params);$response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::ORDERQUERY_URL);if( !$response ){return false;}$result = $this->xml_to_data( $response );if( !empty($result['result_code']) && !empty($result['err_code']) ){$result['err_msg'] = $this->error_code( $result['err_code'] );}return $result;}/*** 关闭订单* @param $out_trade_no     订单号* @return array*/public function closeOrder( $out_trade_no ){$this->params['appid'] = $this->appid;$this->params['mch_id'] = $this->mch_id;$this->params['nonce_str'] = $this->genRandomString();$this->params['out_trade_no'] = $out_trade_no;//获取签名数据$this->sign = $this->MakeSign( $this->params );$this->params['sign'] = $this->sign;$xml = $this->data_to_xml($this->params);$response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::CLOSEORDER_URL);if( !$response ){return false;}$result = $this->xml_to_data( $response );return $result;}/**** 获取支付结果通知数据* return array*/public function getNotifyData(){//获取通知的数据//    $xml = $GLOBALS['HTTP_RAW_POST_DATA'];     $xml = file_get_contents("php://input");    $data = array();    if( empty($xml) ){        return false;    }    $data = $this->xml_to_data( $xml );    if( !empty($data['return_code']) ){        if( $data['return_code'] == 'FAIL' ){            return false;        }    }    return $data;}/*** 接收通知成功后应答输出XML数据* @param string $xml*/public function replyNotify(){$data['return_code'] = 'SUCCESS';$data['return_msg'] = 'OK';$xml = $this->data_to_xml( $data );echo $xml;die();}/*** 生成APP端支付参数* @param  $prepayid   预支付id*/public function getAppPayParams( $prepayid ){$data['appid'] = $this->appid;$data['partnerid'] = $this->mch_id;$data['prepayid'] = $prepayid;$data['package'] = 'Sign=WXPay';$data['noncestr'] = $this->genRandomString();$data['timestamp'] = time();$data['sign'] = $this->MakeSign( $data );return $data;}/*** 生成签名*  @return 签名*/public function MakeSign( $params ){//签名步骤一：按字典序排序数组参数ksort($params);$string = $this->ToUrlParams($params);//签名步骤二：在string后加入KEY$string = $string . "&key=".$this->key;//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;}/*** 将参数拼接为url: key=value&key=value* @param   $params* @return  string*/public function ToUrlParams( $params ){$string = '';if( !empty($params) ){$array = array();foreach( $params as $key => $value ){$array[] = $key.'='.$value;}$string = implode("&",$array);}return $string;}/*** 输出xml字符* @param   $params     参数名称* return   string      返回组装的xml**/public function data_to_xml( $params ){if(!is_array($params)|| count($params) <= 0){return false;}$xml = "<xml>";    foreach ($params 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 string $xml* return array*/public function xml_to_data($xml){if(!$xml){return false;}//将XML转为array//禁止引用外部xml实体libxml_disable_entity_loader(true);$data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);return $data;}/*** 获取毫秒级别的时间戳*/private static function getMillisecond(){//获取毫秒的时间戳$time = explode ( " ", microtime () );$time = $time[1] . ($time[0] * 1000);$time2 = explode( ".", $time );$time = $time2[0];return $time;}/*** 产生一个指定长度的随机字符串,并返回给用户* @param type $len 产生字符串的长度* @return string 随机字符串*/private function genRandomString($len = 32) {$chars = array("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k","l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v","w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G","H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R","S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2","3", "4", "5", "6", "7", "8", "9");$charsLen = count($chars) - 1;// 将数组打乱shuffle($chars);$output = "";for ($i = 0; $i < $len; $i++) {$output .= $chars[mt_rand(0, $charsLen)];}return $output;}/*** 以post方式提交xml到对应的接口url** @param string $xml  需要post的xml数据* @param string $url  url* @param bool $useCert 是否需要证书，默认不需要* @param int $second   url执行超时时间，默认30s* @throws WxPayException*/private function postXmlCurl($xml, $url, $useCert = false, $second = 30){$ch = curl_init();//设置超时curl_setopt($ch, CURLOPT_TIMEOUT, $second);curl_setopt($ch,CURLOPT_URL, $url);curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);//设置headercurl_setopt($ch, CURLOPT_HEADER, FALSE);//要求结果为字符串且输出到屏幕上curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);if($useCert == true){//设置证书//使用证书：cert 与 key 分别属于两个.pem文件curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');//curl_setopt($ch,CURLOPT_SSLCERT, WxPayConfig::SSLCERT_PATH);curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');//curl_setopt($ch,CURLOPT_SSLKEY, WxPayConfig::SSLKEY_PATH);}//post提交方式curl_setopt($ch, CURLOPT_POST, TRUE);curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);//运行curl$data = curl_exec($ch);//返回结果if($data){curl_close($ch);return $data;} else {$error = curl_errno($ch);curl_close($ch);return false;}}/*** 错误代码* @param  $code       服务器输出的错误代码* return string*/public function error_code( $code ){$errList = array('NOAUTH'                =>  '商户未开通此接口权限','NOTENOUGH'             =>  '用户帐号余额不足','ORDERNOTEXIST'         =>  '订单号不存在','ORDERPAID'             =>  '商户订单已支付，无需重复操作','ORDERCLOSED'           =>  '当前订单已关闭，无法支付','SYSTEMERROR'           =>  '系统错误!系统超时','APPID_NOT_EXIST'       =>  '参数中缺少APPID','MCHID_NOT_EXIST'       =>  '参数中缺少MCHID','APPID_MCHID_NOT_MATCH' =>  'appid和mch_id不匹配','LACK_PARAMS'           =>  '缺少必要的请求参数','OUT_TRADE_NO_USED'     =>  '同一笔交易不能多次提交','SIGNERROR'             =>  '参数签名结果不正确','XML_FORMAT_ERROR'      =>  'XML格式错误','REQUIRE_POST_METHOD'   =>  '未使用post传递参数 ','POST_DATA_EMPTY'       =>  'post数据不能为空','NOT_UTF8'              =>  '未使用指定编码格式',);if( array_key_exists( $code , $errList ) ){return $errList[$code];}}}