原创：微信小程序调用【统一下单】、【支付】、【支付回调】api并处理请求
1、服务器端使用TP3.2处理（随便写在一个Controller里面）
/* 小程序报名，生成订单 */
public function make_order(){
if(IS_POST){
$data[\'openid\'] = I(\'POST.openid\');
$data_total = I(\'POST.data_total\');
$data[\'crsNo\'] = \'W\'.date(\'YmdHis\',time()).\'-\'.randomkeys(2);
$insertId = M(\'home_order\',\'xxf_witkey_\')->add($data);
if($insertId){
$this->insertID = $insertId;
$this->data_total = $data_total*100; //订单总金额，单位分
/* 调用微信【统一下单】 */
$this->pay($data_total*100,$data[\'openid\'],$data[\'crsNo\']);
}else{
echo $insertId;
}
//echo json_encode($re);
}
}
/* 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,$order_id){
if(empty($total_fee)){
echo json_encode(array(\'state\'=>0,\'Msg\'=>\'金额有误\'));exit;
}
if(empty($openid)){
echo json_encode(array(\'state\'=>0,\'Msg\'=>\'登录失效，请重新登录(openid参数有误)\'));exit;
}
if(empty($order_id)){
echo json_encode(array(\'state\'=>0,\'Msg\'=>\'自定义订单有误\'));exit;
}
$appid = \'小程序appid\';//如果是公众号 就是公众号的appid;小程序就是小程序的appid
$body = \'自己填\';
$mch_id = \'商户账号\';
$KEY = \'你申请微信支付的key\';
$nonce_str = randomkeys(32);//随机字符串
$notify_url = \'https://m.******.com/index.php/Home/Xiaoxxf/xiao_notify_url\'; //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
$this->sign = $sign;
$post_xml = \'<xml>
<appid>\'.$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;
$tmp[\'package\'] = \'prepay_.$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
$data[\'package\'] = \'prepay_.$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[\'state\'] = 0;
$data[\'text\'] = "错误";
$data[\'RETURN_CODE\'] = $array[\'RETURN_CODE\'];
$data[\'RETURN_MSG\'] = $array[\'RETURN_MSG\'];
}
echo json_encode($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;
}
/**
* 将xml转为array
* @param string $xml
* return array
*/
public function xml_to_array($xml){
if(!$xml){
return false;
}
//将XML转为array
//禁止引用外部xml实体
libxml_disable_entity_loader(true);
$data = json_decode(json_encode(simplexml_load_string($xml, \'SimpleXMLElement\', LIBXML_NOCDATA)), true);
return $data;
}//还有就是，微信要求支付后处理微信发送的回调内容，就是告诉商户，订单交易成功了，你要发送‘我知道了’给微信。
//还有一点就是：这里就是回调url，你预支付填写的notify_url地址。废话不多说，看下面
/* 微信支付完成，回调地址url方法 xiao_notify_url() */
public function xiao_notify_url(){
$post = post_data(); //接受POST数据XML个数
/*
function post_data(){
$receipt = $_REQUEST;
if($receipt==null){
$receipt = file_get_contents("php://input");
if($receipt == null){
$receipt = $GLOBALS[\'HTTP_RAW_POST_DATA\'];
}
}
return $receipt;
}
*/
$post_data = $this->xml_to_array($post); //微信支付成功，返回回调地址url的数据：XML转数组Array $postSign = $post_data[\'sign\']; unset($post_data[\'sign\']); /* 微信官方提醒： * 商户系统对于支付结果通知的内容一定要做【签名验证】, * 并校验返回的【订单金额是否与商户侧的订单金额】一致， * 防止数据泄漏导致出现“假通知”，造成资金损失。 */ ksort($post_data);// 对数据进行排序 $str = $this->ToUrlParams($post_data);//对数组数据拼接成key=value字符串 $user_sign = strtoupper(md5($post_data)); //再次生成签名，与$postSign比较 $where[\'crsNo\'] = $post_data[\'out_trade_no\']; $order_status = M(\'home_order\',\'xxf_witkey_\')->where($where)->find(); if($post_data[\'return_code\']==\'SUCCESS\'&&$postSign){ /* * 首先判断，订单是否已经更新为ok，因为微信会总共发送8次回调确认 * 其次，订单已经为ok的，直接返回SUCCESS * 最后，订单没有为ok的，更新状态为ok，返回SUCCESS */ if($order_status[\'order_status\']==\'ok\'){ $this->return_success(); }else{ $updata[\'order_status\'] = \'ok\'; if(M(\'home_order\',\'xxf_witkey_\')->where($where)->save($updata)){ $this->return_success(); } } }else{ echo \'微信支付失败\'; } } /* * 给微信发送确认订单金额和签名正确，SUCCESS信息 -xzz0521 */ private function return_success(){ $return[\'return_code\'] = \'SUCCESS\'; $return[\'return_msg\'] = \'OK\'; $xml_post = \'<xml> <return_code>\'.$return[\'return_code\'].\'</return_code> <return_msg>\'.$return[\'return_msg\'].\'</return_msg> </xml>\'; echo $xml_post;exit; }
2、小程序端发起下单和支付请求：
/**
* 自定义方法，校验form数据
*/
submitForm: function (e) { //这里是小程序wxml提交form
var that = this;
//#code ，注意这里的form数据你要校验哦。
wx.request({
url: \'https://m.******.com/index.php/Home/Xiaoxxf/make_order\',
header: {
"Content-Type": "application/x-www-form-urlencoded"
},
method: "POST",
data: { openid: wx.getStorageSync(\'openid\'), data_name: e.detail.value.data_name, data_phone: e.detail.value.data_phone, data_IDcard: e.detail.value.data_IDcard, data_num: e.detail.value.data_num, data_addr: e.detail.value.data_addr, data_remark: e.detail.value.data_remark, data_total: e.detail.value.data_num * that.data.unitPrice,a_id:that.data.a_id},
success: function (res) {
if (res.data.state==1) {
// --------- 订单生成成功，发起支付请求 ------------------
wx.requestPayment({
timeStamp: res.data.timeStamp,
nonceStr: res.data.nonceStr, //字符串随机数
package: res.data.package,
signType: res.data.signType,
paySign: res.data.paySign,
\'success\': function (res) {
console.log(res.errMsg); //requestPayment:ok==>调用支付成功
wx.showToast({
title: \'报名成功\',//这里打印出报名成功
icon: \'success\',
duration: 1000
})
},
\'fail\': function (res) {
console.log(res.errMsg);
},
\'complete\': function (res) {
console.log(res.errMsg);
}
})
} else if (res.data.state == 0){
wx.showToast({
title: res.data.Msg,
icon: \'fail\',
duration: 1000
})
}else{
wx.showToast({
title: \'系统繁忙，请稍后重试~\',
icon: \'fail\',
duration: 1000
})
}
}
})
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