微信小程序與php 實現微信支付的簡單實例

小程序訪問地址：

payfee.PHP:

include 'WeixinPay.php'; $appid=''; $openid= $_GET['id']; $mch_id=''; $key=''; $out_trade_no = $mch_id. time(); $total_fee = $_GET['fee']; if(empty($total_fee)) //押金 {   $body = "充值押金";   $total_fee = floatval(99*100); }  else {    $body = "充值余額";    $total_fee = floatval($total_fee*100);  } $weixinpay = new WeixinPay($appid,$openid,$mch_id,$key,$out_trade_no,$body,$total_fee); $return=$weixinpay->pay();  echo json_encode($return); 

WeixinPay.php:

<?php   /*  * 小程序微信支付  */   class WeixinPay {     protected $appid;   protected $mch_id;   protected $key;   protected $openid;   protected $out_trade_no;   protected $body;   protected $total_fee;       function __construct($appid, $openid, $mch_id, $key,$out_trade_no,$body,$total_fee) {     $this->appid = $appid;     $this->openid = $openid;     $this->mch_id = $mch_id;     $this->key = $key;     $this->out_trade_no = $out_trade_no;     $this->body = $body;     $this->total_fee = $total_fee;   }     public function pay() {     //統一下單接口     $return = $this->weixinapp();     return $return;   }     //統一下單接口   private function unifiedorder() {     $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';     $parameters = array(       'appid' => $this->appid, //小程序ID       'mch_id' => $this->mch_id, //商戶號       'nonce_str' => $this->createNoncestr(), //隨機字符串 //      'body' => 'test', //商品描述       'body' => $this->body, //      'out_trade_no' => '2015450806125348', //商戶訂單號       'out_trade_no'=> $this->out_trade_no, //      'total_fee' => floatval(0.01 * 100), //總金額 單位 分       'total_fee' => $this->total_fee, //      'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //終端IP       'spbill_create_ip' => '192.168.0.161', //終端IP       'notify_url' => 'http://www.weixin.qq.com/wxpay/pay.php', //通知地址 確保外網能正常訪問       'openid' => $this->openid, //用戶id       'trade_type' => 'JSAPI'//交易類型     );     //統一下單簽名     $parameters['sign'] = $this->getSign($parameters);     $xmlData = $this->arrayToXml($parameters);     $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60));     return $return;   }     private static function postXmlCurl($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);     //要求結果為字符串且輸出到屏幕上     curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);     //post提交方式     curl_setopt($ch, CURLOPT_POST, TRUE);     curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);       curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);     curl_setopt($ch, CURLOPT_TIMEOUT, 40);     set_time_limit(0);       //運行curl     $data = curl_exec($ch);     //返回結果     if ($data) {       curl_close($ch);       return $data;     } else {       $error = curl_errno($ch);       curl_close($ch);       throw new WxPayException("curl出錯，錯誤碼:$error");     }   }            //數組轉換成xml   private function arrayToXml($arr) {     $xml = "<root>";     foreach ($arr as $key => $val) {       if (is_array($val)) {         $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";       } else {         $xml .= "<" . $key . ">" . $val . "</" . $key . ">";       }     }     $xml .= "</root>";     return $xml;   }     //xml轉換成數組   private function xmlToArray($xml) {       //禁止引用外部xml實體        libxml_disable_entity_loader(true);       $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);       $val = json_decode(json_encode($xmlstring), true);       return $val;   }     //微信小程序接口   private function weixinapp() {     //統一下單接口     $unifiedorder = $this->unifiedorder(); //    print_r($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     );     //簽名     $parameters['paySign'] = $this->getSign($parameters);     return $parameters;   }     //作用：產生隨機字符串，不長于32位   private function createNoncestr($length = 32) {     $chars = "abcdefghijklmnopqrstuvwxyz0123456789";     $str = "";     for ($i = 0; $i < $length; $i++) {       $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);     }     return $str;   }     //作用：生成簽名   private function getSign($Obj) {     foreach ($Obj as $k => $v) {       $Parameters[$k] = $v;     }     //簽名步驟一：按字典序排序參數     ksort($Parameters);     $String = $this->formatBizQueryParaMap($Parameters, false);     //簽名步驟二：在string后加入KEY     $String = $String . "&key=" . $this->key;     //簽名步驟三：MD5加密     $String = md5($String);     //簽名步驟四：所有字符轉為大寫     $result_ = strtoupper($String);     return $result_;   }     ///作用：格式化參數，簽名過程需要使用   private function formatBizQueryParaMap($paraMap, $urlencode) {     $buff = "";     ksort($paraMap);     foreach ($paraMap as $k => $v) {       if ($urlencode) {         $v = urlencode($v);       }       $buff .= $k . "=" . $v . "&";     }     $reqPar;     if (strlen($buff) > 0) {       $reqPar = substr($buff, 0, strlen($buff) - 1);     }     return $reqPar;   }   }