//微信支付類
class WeiXinPay{
 //=======【基本信息設置】=====================================
 //微信公眾號身份的唯一標識
 protected $APPID = appid;//填寫您的appid。微信公眾平臺里的
 protected $APPSECRET = secret;
 //受理商ID，身份標識
 protected $MCHID = '11111111';//商戶id
 //商戶支付密鑰Key
 protected $KEY = '192006250b4c09247ec02edce69f6a2d';
 //回調通知接口
 protected $APPURL = 'https://smart.afei.com/receivesuc';
 //交易類型
 protected $TRADETYPE = 'JSAPI';
 //商品類型信息
 protected $BODY = 'wx/book';
 //微信支付類的構造函數
 function __construct($openid,$outTradeNo,$totalFee){
 $this->openid = $openid; //用戶唯一標識
 $this->outTradeNo = $outTradeNo; //商品編號
 $this->totalFee = $totalFee; //總價
 }
 //微信支付類向外暴露的支付接口
 public function pay(){
 $result = $this->weixinapp();
 return $result;
 }
 //對微信統一下單接口返回的支付相關數據進行處理
 private function weixinapp(){
 $unifiedorder=$this->unifiedorder();
 $parameters=array(
 'appId'=>$this->APPID,//小程序ID
 'timeStamp'=>''.time().'',//時間戳
 'nonceStr'=>$this->createNoncestr(),//隨機串
 'package'=>'prepay_id='.$unifiedorder['prepay_id'],//數據包
 'signType'=>'MD5'//簽名方式
 );
 $parameters['paySign']=$this->getSign($parameters);
 return $parameters;
 }
 /*
 *請求微信統一下單接口
 */
 private function unifiedorder(){
 $parameters = array(
 'appid' => $this->APPID,//小程序id
 'mch_id'=> $this->MCHID,//商戶id
 'spbill_create_ip'=>$_SERVER['REMOTE_ADDR'],//終端ip
 'notify_url'=>$this->APPURL, //通知地址
 'nonce_str'=> $this->createNoncestr(),//隨機字符串
 'out_trade_no'=>$this->outTradeNo,//商戶訂單編號
 'total_fee'=>floatval($this->totalFee), //總金額
 'open_id'=>$this->openid,//用戶openid
 'trade_type'=>$this->TRADETYPE,//交易類型
 'body' =>$this->BODY, //商品信息
 );
 $parameters['sign'] = $this->getSign($parameters);
 $xmlData = $this->arrayToXml($parameters);
 $xml_result = $this->postXmlCurl($xmlData,'https://api.mch.weixin.qq.com/pay/unifiedorder',60);
 $result = $this->xmlToArray($xml_result);
 return $result;
 }
 //數組轉字符串方法
 protected function arrayToXml($arr){
 $xml = "<xml>";
 foreach ($arr as $key=>$val)
 {
 if (is_numeric($val)){
 $xml.="<".$key.">".$val."</".$key.">";
 }else{
 $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
 }
 }
 $xml.="</xml>";
 return $xml;
 }
 protected function xmlToArray($xml){
 $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
 return $array_data;
 }
 //發送xml請求方法
 private static function postXmlCurl($xml, $url, $second = 30)
 {
 $ch = curl_init();
 //設置超時
 curl_setopt($ch, CURLOPT_TIMEOUT, $second);
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //嚴格校驗
 //設置header
 curl_setopt($ch, CURLOPT_HEADER, FALSE);
 //要求