使用uniapp开发示例，原生需将uni标签改为wx即可（前端）
uni.request({ //支付统一下单
url: this.$api + '/index/user/uniforder',
method: 'POST',
header: {
'content-type': 'application/x-www-form-urlencoded',
'token': this.userInfo.token
},
data: {
name:this.obj.name,
uid:this.userInfo.uid,
orderId:'xiuli'+rest.data.data,
price:this.obj.jiage*100
},
success: (res)=> {
if(res.data.code==600){
uni.requestPayment({ //唤起支付
provider: 'wxpay',
timeStamp: res.data.data.timeStamp,
nonceStr: res.data.data.nonceStr,
package: res.data.data.package,
signType: res.data.data.signType,
paySign: res.data.data.paySign,
success:(res)=> {
console.log(res)
uni.request({ //订单支付
url: this.$api + '/index/user/buyorder',
method: 'POST',
header: {
'content-type': 'application/x-www-form-urlencoded',
'token': this.userInfo.token
},
data: {
orderId:'xiuli'+rest.data.data,
id:rest.data.data
},
success: (res)=> {
if(res.data.code==600){
uni.navigateTo({
url: 'order?type'+1
});
}
else{
uni.showToast({
icon:'error',
title: '支付失败',
duration: 2000,
success:(res)=>{
uni.navigateTo({
url: 'order?type'+0
});
}
});
}
},
})
},
fail:(err)=> {
uni.showToast({
icon:'error',
title: '支付取消',
duration: 2000
});
}
});
}
else{
uni.showToast({
icon:'error',
title: res.data.msg,
duration: 2000
});
}
}
})
PHP接口封装（后端）
1、统一下单
public function uniforder(){
$post = input('post.');
if(!isset($post['uid'])){
return PubClass::jsonErrorData(500,'参数不完整');
}
$user = Db::name('user')->where(['id'=>$post['uid']])->find();
if(!$user){
return PubClass::jsonErrorData(500,'该用户不存在');
}
$system = Db::name('system')->order('id desc')->find();
$time = (string)time();
//统一下单数组
$dataArr['appid'] = $system['appid'];
$dataArr['body'] = $post['name'];
$dataArr['mch_id'] = $system['shanghuhao'];
$dataArr['nonce_str'] = md5(uniqid(microtime(true),true).rand());
$dataArr['notify_url'] = 'https://www.weixin.qq.com/wxpay/pay.php';
$dataArr['openid'] = $user['openid'];
$dataArr['out_trade_no'] = $post['orderId'];
$dataArr['spbill_create_ip'] = $_SERVER['REMOTE_ADDR'];
$dataArr['total_fee'] = $post['price'];
$dataArr['trade_type'] = 'JSAPI';
//订单查询数组
$orderArr['appid'] = $system['appid'];
$orderArr['mch_id'] = $system['shanghuhao'];
$orderArr['nonce_str'] = $dataArr['nonce_str'];
$orderArr['out_trade_no'] = $dataArr['out_trade_no'];
$ordertring = ''; //查询订单签名
foreach($orderArr as $key=>$value){
$ordertring .= $key.'='.$value.'&';
}
$ordertring = $ordertring."key=".$system['miyao'];
$orderSign = strtoupper(MD5($ordertring));
$orderArr['sign'] = $orderSign;
$orderxml = PubClass::arr2xml($orderArr);
$orders = PubClass::curl_get('https://api.mch.weixin.qq.com/pay/orderquery',$orderxml);//查询订单接口
//XML转数组
$xmlorder = json_decode(json_encode(simplexml_load_string($orders, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
if(isset($xmlorder['transaction_id'])){
return PubClass::jsonErrorData(500,'该订单已支付');
}
$string = ''; //统一下单签名
foreach($dataArr as $key=>$value){
$string .= $key.'='.$value.'&';
}
$string = $string."key=".$system['miyao'];
$dataArr['sign'] = strtoupper(MD5($string));
$xml = PubClass::arr2xml($dataArr);
$rexml = PubClass::curl_get('https://api.mch.weixin.qq.com/pay/unifiedorder',$xml);//统一下单接口
//XML转数组
$xmlarr = json_decode(json_encode(simplexml_load_string($rexml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
if(!isset($xmlarr['prepay_id'])){
return PubClass::jsonErrorData(500,$xmlarr);
}
//支付返回数组
$reData['nonceStr'] = $dataArr['nonce_str'];
$reData['package'] = 'prepay_id='.$xmlarr['prepay_id'];
$reData['signType'] = 'MD5';
$reData['timeStamp'] = $time;
//二次签名数组
$newdata['appId'] = $system['appid'];
$newdata['nonceStr'] = $reData['nonceStr'];
$newdata['package'] = $reData['package'];
$newdata['signType'] = $reData['signType'];
$newdata['timeStamp'] = $reData['timeStamp'];
$newstring = ''; //支付二次签名
foreach($newdata as $key=>$value){
$newstring .= $key.'='.$value.'&';
}
$newstring = $newstring."key=".$system['miyao'];
$paySign = strtoupper(MD5($newstring));
$reData['paySign'] = $paySign;
return PubClass::jsonSuccessData($reData);
}
公共类：数组转xml
public static function arr2xml($data, $root = true){
$str="";
if($root)$str .= "
"; foreach($data as $key => $val){
if(is_array($val)){
$child = arr2xml($val, false);
$str .= "<$key>$child";
}else{
$str.= "<$key>$val";
}
}
if($root)$str .= "";
return $str;
}
2、支付订单
public function buyorder(){
$post = input('post.');
//微信支付成功订单查询操作
//订单查询数组
$system = Db::name('system')->order('id desc')->find();
$orderArr['appid'] = $system['appid'];
$orderArr['mch_id'] = $system['shanghuhao'];
$orderArr['nonce_str'] = md5(uniqid(microtime(true),true).rand());
$orderArr['out_trade_no'] = $post['orderId'];
$ordertring = ''; //查询订单签名
foreach($orderArr as $key=>$value){
$ordertring .= $key.'='.$value.'&';
}
$ordertring = $ordertring."key=".$system['miyao'];
$orderSign = strtoupper(MD5($ordertring));
$orderArr['sign'] = $orderSign;
$orderxml = PubClass::arr2xml($orderArr);
$orders = PubClass::curl_get('https://api.mch.weixin.qq.com/pay/orderquery',$orderxml);//查询订单接口
//XML转数组
$xmlorder = json_decode(json_encode(simplexml_load_string($orders, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
if(isset($xmlorder['transaction_id'])){
$zhifuOrder = $xmlorder['transaction_id'];
$data=Db::name('buylog')->where(['id'=>$post['id']])->update(['type'=>1,'transaction_id'=>$zhifuOrder]);
return PubClass::jsonSuccessData($data);
}else{
return PubClass::jsonErrorData(500,'该订单未支付');
}
}
注：基于TP5框架，只给了关键类，其余的公共类自己随便定义
也可使用 V3 版本支付，接口地址：https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi
签名方式支持：V3:RSA V2：MD5，HMAC-SHA256 ；微信开发文档菜单栏不兼容360浏览器