PHP实现微信小程序支付
本文仅记录了微信小程序支付开发的基本流程和代码，具体业务需自行修改。tp5框架下演示：
参考：
微信小程序支付：业务流程
SDK与DEMO: 下载页
PHPPayDemo: demo
小程序端：
goPay(e){
var that = this;
//发起预支付，获取所需参数 wx.request({ url: app.globalData.host + \'/api/wx_pay/createOrder\', //请求地址 data: { openid: wx.getStorageSync(\'openid\'), total_fee: that.data.totalPrice, goods: JSON.stringify(that.data.goods) }, method: \'POST\', success(res){
console.log(res)
if(res.data.code == 1){ //发起微信支付 wx.requestPayment({ 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(r) {
console.log(r) //do something //比如回调，修改状态等操作 }, fail() { wx.showToast({ title: \'支付失败\', icon: \'none\' }) } }) }else{ wx.showToast({ title: res.data.data, icon: \'none\' }) } } }) },
PHP端：
WxPay.php
<?php namespace app\api\controller; use app\api\controller\Common; use think\Db; /** * 微信支付 */ class WxPay extends Common { //生成订单 public function createOrder(){ if (request()->isPost()) {
$openid = input(\'openid\'); $total_fee = input(\'total_fee\');$orderid = get_order_sn(); //生成订单号 if (!$openid) { return json(array(\'code\'=>3, \'data\'=>\'no openid\')); } $goods = json_decode(input(\'goods\'), TRUE); // 添加订单,自行添加 $insert_order_id = Db::name(\'order\') ->insertGetId(array( \'pay_price\' => $total_fee, \'orderid\' => $orderid )); if($insert_order_id){
/* 调用微信【统一下单】 */
$res = $this->pay($total_fee, $openid, $orderid);
return json(array(\'code\'=>1, \'data\'=>$res, \'oid\'=>$insert_order_id));
}
}
}
/* 首先在服务器端调用微信【统一下单】接口，返回prepay_id和sign签名等信息给前端，前端调用微信支付接口 */
private function Pay($total_fee, $openid, $order_id, $body=\'\'){
$appid = config(\'myapp.appid\');//小程序的appid
$body = config(\'site.title\').\'-\'.$body;
$mch_id = config(\'myapp.pay_mchid\');
$KEY = config(\'myapp.pay_apikey\');
$nonce_str = (string)mt_rand(10000, 99999).time();//随机字符串
$notify_url = request()->domain().\'api/wx_pay/notify\'; //支付完成回调地址url,不能带参数
$out_trade_no = $order_id; //商户订单号
$spbill_create_ip = $_SERVER[\'SERVER_ADDR\'];
$trade_type = \'JSAPI\';//交易类型 默认JSAPI
//这里是按照顺序的 因为下面的签名是按照(字典序)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;//服务器终端的ip
$post[\'total_fee\'] = intval($total_fee); //总金额 最低为一分钱 必须是整数
$post[\'trade_type\'] = $trade_type;
$sign = $this->MakeSign($post, $KEY); //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> \';
//统一下单接口prepay_id
$url = \'https://api.mch.weixin.qq.com/pay/unifiedorder\';
$xml = $this->http_request($url,$post_xml); //POST方式请求http
$array = $this->xml2array($xml); //将【统一下单】api返回xml数据转换成数组，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[\'code\'] = 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\'] = $this->MakeSign($tmp,$KEY); //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[\'code\'] = 0;
$data[\'msg\'] = "错误";
$data[\'RETURN_CODE\'] = $array[\'RETURN_CODE\'];
$data[\'RETURN_MSG\'] = $array[\'RETURN_MSG\'];
$data[\'ERR_CODE_DES\'] = $array[\'ERR_CODE_DES\'];
}
return $data;
}
/** * 生成签名, $KEY就是支付key * @return 签名 */
public function MakeSign($params,$KEY){
//签名步骤一：按字典序排序数组参数
ksort($params);
$string = $this->ToUrlParams($params); //参数进行拼接key=value&k=v
//签名步骤二：在string后加入KEY
$string = $string . "&key=".$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;
}
/** * 将参数拼接为url: key=value&key=value * @param $params * @return string */
public function ToUrlParams( $params ){
$string = \'\';
if( !empty($params) ){
$array = array();
foreach( $params as $key => $value ){
$array[] = $key.\'=\'.$value;
}
$string = implode("&",$array);
}
return $string;
}
/** * 调用接口， $data是数组参数 * @return 签名 */
public function http_request($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 $output;
}
//获取xml里面数据，转换成array
private function xml2array($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;
}
//支付完后的回调
public function notify(){
//do something
//更新支付状态
//更新购物商品状态
return json(array(\'code\'=> 1, \'data\'=>\'支付成功\'));
}
没整理好，以后有时间再说吧，，，
以上所有方法都可从SDK及DEMO中寻得，官方参考。
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