原博：
https://blog.csdn.net/fredrik/article/details/79697963
微信小程序实现微信支付功能
直接把里面的参数替换成你的就可以了，前提是你要开通的有微信支付功能，需要商户号，appid，appsecret,openid，
//小程序端代码：
pay:function(){
var that=this
wx.getStorage({
key: ‘openid‘,
success: function(res) {
wx.request({
//这里是后台的处理方法，url是自定义的，直接换成你自己的后台处理方法即可，Wx_Pay这个方法在下面写的有//后台用的php做处理，java的可以参考方法，道理都是一样的
url: url + ‘Wx_Pay‘,
data: {
//用户的openid
openid:res.data,
//用户的openid
openid:res.data,
fee: that.data.totalPrice, //支付金额
details: that.data.goodsList[0].goods_name,//支付商品的名称
},
success:function(result){
if(result.data){
//out_trade_no=res.data[‘out_trade_no‘];
wx.requestPayment({
timeStamp: result.data[‘timeStamp‘],
nonceStr: result.data[‘nonceStr‘],
package: result.data[‘package‘],
signType: ‘MD5‘,
paySign: result.data[‘paySign‘],
‘success‘:function(successret){
console.log(‘支付成功‘);
//获取支付用户的信息
//获取支付用户的信息
wx.getStorage({
key: ‘userInfo‘,
success: function (getuser) {
//加入订单表做记录
//加入订单表做记录
wx.request({
url: url + ‘Wx_AddOrder‘,
data: {
uname: getuser.data.nickName,
goods: that.data.goodsList[0].goods_name,
price: that.data.totalPrice,
openid:res.data,
},
success: function (lastreturn) {
console.log("存取成功");
}
})
},
})
},‘fail‘:function(res){
}
})
}
}
})
},
})
},
//后台
//微信支付
public function Wx_Pay(){
$request=Request::instance();
$fee=$request->param(‘fee‘);
$details=$request->param(‘details‘);//商品的详情，比如iPhone8，紫色
// $fee = 0.01;//举例充值0.01
$appid = ‘appid‘;//appid
$body = $details;// ‘金邦汇商城‘;//‘【自己填写】‘
$mch_id = ‘1486742092‘;//‘你的商户号【自己填写】‘
$nonce_str = $this->nonce_str();//随机字符串
$notify_url = ‘https://zys.jinbh.cn/admin/Api/Wx_Speech‘;//回调的url【自己填写】‘;
$openid = $request->param(‘openid‘);//‘用户的openid【自己填写】‘;
$out_trade_no = $this->order_number($openid);//商户订单号
$spbill_create_ip = ‘123.206.45.131‘;//‘服务器的ip【自己填写】‘;
$total_fee = $fee*100;//因为充值金额最小是1 而且单位为分 如果是充值1元所以这里需要*100
$trade_type = ‘JSAPI‘;//交易类型 默认
//这里是按照顺序的 因为下面的签名是按照顺序 排序错误 肯定出错
$post[‘appid‘] = $appid;
$post[‘body‘] = $body;
$post[‘mch_id‘] = $mch_id;
$post[‘nonce_str‘] = $nonce_str;//随机字符串
$post[‘notify_url‘] = $notify_url;
$post[‘openid‘] = $openid;
$post[‘out_trade_no‘] = $out_trade_no;
$post[‘spbill_create_ip‘] = $spbill_create_ip;//终端的ip
$post[‘total_fee‘] = $total_fee;//总金额 最低为一块钱 必须是整数
$post[‘trade_type‘] = $trade_type;
$sign = $this->sign($post);//签名
$post_xml = ‘<xml>
<appid>‘.$appid.‘</appid>
<body>‘.$body.‘</body>
<mch_id>‘.$mch_id.‘</mch_id>
<nonce_str>‘.$nonce_str.‘</nonce_str>
<notify_url>‘.$notify_url.‘</notify_url>
<openid>‘.$openid.‘</openid>
<out_trade_no>‘.$out_trade_no.‘</out_trade_no>
<spbill_create_ip>‘.$spbill_create_ip.‘</spbill_create_ip>
<total_fee>‘.$total_fee.‘</total_fee>
<trade_type>‘.$trade_type.‘</trade_type>
<sign>‘.$sign.‘</sign>
</xml> ‘;
//统一接口prepay_id
$url = ‘https://api.mch.weixin.qq.com/pay/unifiedorder‘;
$xml = $this->http_request($url,$post_xml);
$array = $this->xml($xml);//全要大写
if($array[‘RETURN_CODE‘] == ‘SUCCESS‘ && $array[‘RESULT_CODE‘] == ‘SUCCESS‘){
$time = time();
$tmp=‘‘;//临时数组用于签名
$tmp[‘appId‘] = $appid;
$tmp[‘nonceStr‘] = $nonce_str;
$tmp[‘package‘] = ‘prepay_id=‘.$array[‘PREPAY_ID‘];
$tmp[‘signType‘] = ‘MD5‘;
$tmp[‘timeStamp‘] = "$time";
$data[‘state‘] = 1;
$data[‘timeStamp‘] = "$time";//时间戳
$data[‘nonceStr‘] = $nonce_str;//随机字符串
$data[‘signType‘] = ‘MD5‘;//签名算法，暂支持 MD5
$data[‘package‘] = ‘prepay_id=‘.$array[‘PREPAY_ID‘];//统一下单接口返回的 prepay_id 参数值，提交格式如：prepay_id=*
$data[‘paySign‘] = $this->sign($tmp);//签名,具体签名方案参见微信公众号支付帮助文档;
$data[‘out_trade_no‘] = $out_trade_no;
}else{
$data[‘state‘] = 0;
$data[‘text‘] = "错误";
$data[‘RETURN_CODE‘] = $array[‘RETURN_CODE‘];
$data[‘RETURN_MSG‘] = $array[‘RETURN_MSG‘];
}
echo json_encode($data);
}
//随机32位字符串
private function nonce_str(){
$result = ‘‘;
$str = ‘QWERTYUIOPASDFGHJKLZXVBNMqwertyuioplkjhgfdsamnbvcxz‘;
for ($i=0;$i<32;$i++){
$result .= $str[rand(0,48)];
}
return $result;
}
//生成订单号
private function order_number($openid){
//date(‘Ymd‘,time()).time().rand(10,99);//18位
return md5($openid.time().rand(10,99));//32位
}
//签名 $data要先排好顺序
public function sign($data)
{
$stringA = ‘‘;
foreach ($data as $key => $value) {
if (!$value) continue;
if ($stringA) $stringA .= ‘&‘ . $key . "=" . $value;
else $stringA = $key . "=" . $value;
}
$wx_key = ‘Zhangyusheng19810318015729366660‘;//申请支付后有给予一个商户账号和密码，登陆后自己设置key
$stringSignTemp = $stringA . ‘&key=‘ . $wx_key;//申请支付后有给予一个商户账号和密码，登陆后自己设置key
return strtoupper(md5($stringSignTemp));
}
//curl请求啊
function http_request($url, $data = null, $headers = array())
{
$curl = curl_init();
if (count($headers) >= 1) {
curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
}
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
if (!empty($data)) {
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
}
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($curl);
curl_close($curl);
return $output;
}
//获取xml
private function xml($xml){
$p = xml_parser_create();
xml_parse_into_struct($p, $xml, $vals, $index);
xml_parser_free($p);
$data = "";
foreach ($index as $key=>$value) {
if($key == ‘xml‘ || $key == ‘XML‘) continue;
$tag = $vals[$value[0]][‘tag‘];
$value = $vals[$value[0]][‘value‘];
$data[$tag] = $value;
}
return $data;
}
//微信支付结束