PHP实现微信小程序在线支付功能(代码实例)

include 'WeixinPay.php';
$appid=''; //小程序appid
$openid= $_POST['id'];
$mch_id=''; //微信支付商户支付号
$key=''; //Api密钥
$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 = "充值余额";
   $total_fee = floatval($total_fee*100);
 }
$weixinpay = new WeixinPay($appid,$openid,$mch_id,$key,$out_trade_no,$body,$total_fee);
$return=$weixinpay- pay();
echo json_encode($return);

/*
* 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() {
//统一下单接口
$return = $this- weixinapp();
return $return;
}
//统一下单接口
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, //商户号
'nonce_str' =  $this- createNoncestr(), //随机字符串
//      'body' =  'test', //商品描述
'body' =  $this- body,
//      'out_trade_no' =  '2018013106125348', //商户订单号
'out_trade_no'=  $this- out_trade_no,
//      'total_fee' =  floatval(0.01 * 100), //总金额 单位 分
'total_fee' =  $this- total_fee,
'spbill_create_ip' =  $_SERVER['REMOTE_ADDR'], //终端IP
// 'spbill_create_ip' =  '192.168.0.161', //终端IP
'notify_url' =  'https://www.weixin.qq.com/wxpay/notify.php', //通知地址 确保外网能正常访问
'openid' =  $this- openid, //用户id
'trade_type' =  'JSAPI'//交易类型
);
//统一下单签名
$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) 
{
$ch = curl_init();
//设置超时
curl_setopt($ch, CURLOPT_TIMEOUT, $second);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
//设置header
curl_setopt($ch, CURLOPT_HEADER, FALSE);
//要求结果为字符串且输出到屏幕上
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
//post提交方式
curl_setopt($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);
//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($ch);
throw new WxPayException("curl出错，错误码:$error");
}
}
//数组转换成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 $xml;
}
//xml转换成数组
private function xmlToArray($xml) {
//禁止引用外部xml实体 
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() {
//统一下单接口
$unifiedorder = $this- unifiedorder();
//    print_r($unifiedorder);
$parameters = array(
'appId' =  $this- appid, //小程序ID
'timeStamp' =  '' . time() . '', //时间戳
'nonceStr' =  $this- createNoncestr(), //随机串
'package' =  'prepay_id=' . $unifiedorder['prepay_id'], //数据包
'signType' =  'MD5'//签名方式
);
//签名
$parameters['paySign'] = $this- getSign($parameters);
return $parameters;
}
//作用：产生随机字符串，不长于32位
private function createNoncestr($length = 32) {
$chars = "abcdefghijklmnopqrstuvwxyz0123456789";
$str = "";
for ($i = 0; $i < $length; $i++) { $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1); } return $str; } //作用：生成签名 private function getSign($Obj) { foreach ($Obj as $k =  $v) {
$Parameters[$k] = $v;
}
//签名步骤一：按字典序排序参数
ksort($Parameters);
$String = $this- formatBizQueryParaMap($Parameters, false);
//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 $result_;
}
///作用：格式化参数，签名过程需要使用
private function formatBizQueryParaMap($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;
}
}

wx.request({
url: 'https://yourhost.com/wxpay/payfee.php',//改成你自己的链接
data:{
id: app.globalData.openid,//获取用户openid
fee:100 //商品价格
},
header: {
'Content-Type': 'application/x-www-form-urlencoded'
},
method: 'POST',
success: function (res) {
console.log(res.data);
console.log('调起支付');
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)
}
});

$postXml = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信参数 
// 接受不到参数可以使用file_get_contents("php://input"); PHP高版本中$GLOBALS好像已经被废弃了
if (empty($postXml)) {
return false;
}
//将xml格式转换成数组
function xmlToArray($xml) {
//禁止引用外部xml实体 
libxml_disable_entity_loader(true);
$xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', 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'];