PHP實現微信小程式線上支付功能(程式碼例項)
阿新 • • 發佈：2020-03-08
小程式訪問地址：payfee.php如果使用TP框架處理後臺的話，寫成方法即可
include 'WeixinPay.php';
$appid=''; //小程式appid
$openid= $_POST['id'];
$mch_id=''; //微信支付商戶支付號
$key=''; //Api金鑰
$out_trade_no = $mch_id. time();
$total_fee = $_POST['fee'];
if (empty($total_fee)) { //押金
$body = "充值押金";
$total_fee = floatval(99*100);
} else {
$body = "充值餘額";
$total_fee = floatval($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微信小程式支付類 所有微信小程式需要的引數都已經寫入
/*
* 小程式微信支付
*/
class WeixinPay {
protected $appid;
protected $mch_id;
protected $key;
protected $openid;
protected $out_trade_no;
protected $body;
protected $total_fee;
function __construct($appid,$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() {
//統一下單介面
$return = $this->weixinapp();
return $return;
}
//統一下單介面
private function unifiedorder() {
$url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
$parameters = array(
'appid' => $this->appid,//小程式ID
'mch_id' => $this->mch_id,//商戶號
'nonce_str' => $this->createNoncestr(),//隨機字串
// 'body' => 'test',//商品描述
'body' => $this->body,// 'out_trade_no' => '2018013106125348',//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' => 'https://www.weixin.qq.com/wxpay/notify.php',//通知地址 確保外網能正常訪問
'openid' => $this->openid,//使用者id
'trade_type' => 'JSAPI'//交易型別
);
//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,$second = 30)
{
$ch = curl_init();
//設定超時
curl_setopt($ch,CURLOPT_TIMEOUT,$second);
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE); //嚴格校驗
//設定header
curl_setopt($ch,CURLOPT_HEADER,FALSE);
//要求結果為字串且輸出到螢幕上
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,40);
set_time_limit(0);
//執行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");
}
}
//陣列轉換成xml
private function arrayToXml($arr) {
$xml = "<xml>";
foreach ($arr as $key => $val) {
if (is_array($val)) {
$xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
} else {
$xml .= "<" . $key . ">" . $val . "</" . $key . ">";
}
}
$xml .= "</xml>";
return $xml;
}
//xml轉換成陣列
private function xmlToArray($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;
}
//微信小程式介面
private function weixinapp() {
//統一下單介面
$unifiedorder = $this->unifiedorder();
// print_r($unifiedorder);
$parameters = array(
'appId' => $this->appid,//小程式ID
'timeStamp' => '' . time() . '',//時間戳
'nonceStr' => $this->createNoncestr(),//隨機串
'package' => 'prepay_id=' . $unifiedorder['prepay_id'],//資料包
'signType' => 'MD5'//簽名方式
);
//簽名
$parameters['paySign'] = $this->getSign($parameters);
return $parameters;
}
//作用：產生隨機字串，不長於32位
private function createNoncestr($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] = $v;
}
//簽名步驟一：按字典序排序引數
ksort($Parameters);
$String = $this->formatBizQueryParaMap($Parameters,false);
//簽名步驟二：在string後加入KEY
$String = $String . "&key=" . $this->key;
//簽名步驟三：MD5加密
$String = md5($String);
//簽名步驟四：所有字元轉為大寫
$result_ = strtoupper($String);
return $result_;
}
///作用：格式化引數，簽名過程需要使用
private function formatBizQueryParaMap($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,strlen($buff) - 1);
}
return $reqPar;
}
}
小程式頁面請求處理：
wx.request({
url: 'https://yourhost.com/wxpay/payfee.php',//改成你自己的連結
data:{
id: app.globalData.openid,//獲取使用者openid
fee:100 //商品價格
},header: {
'Content-Type': 'application/x-www-form-urlencoded'
},method: 'POST',success: function (res) {
console.log(res.data);
console.log('調起支付');
wx.requestPayment({
'timeStamp': res.data.timeStamp,'nonceStr': res.data.nonceStr,'package': res.data.package,'signType': 'MD5','paySign': res.data.paySign,'success': function (res) {
console.log('success');
wx.showToast({
title: '支付成功',icon: 'success',duration: 3000
});
},'fail': function (res) {
console.log(res);
},'complete': function (res) {
console.log('complete');
}
});
},fail: function (res) {
console.log(res.data)
}
});回撥URL：notify.php
$postXml = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信引數
// 接受不到引數可以使用file_get_contents("php://input"); PHP高版本中$GLOBALS好像已經被廢棄了
if (empty($postXml)) {
return false;
}
//將xml格式轉換成陣列
function xmlToArray($xml) {
//禁止引用外部xml實體
libxml_disable_entity_loader(true);
$xmlstring = simplexml_load_string($xml,LIBXML_NOCDATA);
$val = json_decode(json_encode($xmlstring),true);
return $val;
}
$attr = xmlToArray($postXml);
$total_fee = $attr['total_fee'];
$open_id = $attr['openid'];
$out_trade_no = $attr['out_trade_no'];
$time = $attr['time_end'];
So：在微信的非同步通知後，也需要給微信伺服器，返回一個資訊，只不過微信的所有資料格式都是xml的，所以我們在返回一個數據給微信即可。
echo exit('<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>');
總結
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