微信JSAPI支付，统一下单接口

今天小编给大家分享一下微信支付的统一下单接口，其实微信官网上也有SDK和DEMO下载了，但是不太好理解，小编就自己整理一份容易理解的代码，看不懂官方的，就来看看小编这份吧，哈哈~

新建一个类WxPayJsApi.php：

// +----------------------------------------------------------------------

// | 微信JSAPI支付

// +----------------------------------------------------------------------

// | Copyright (c) 2017 http://www.lrfun.com All rights reserved.

// +----------------------------------------------------------------------

// | Author: lrfun

// +----------------------------------------------------------------------

// | Date: 2017-06-12

// +----------------------------------------------------------------------

Class WxPayJsApi{

protected $appid; protected $mchid;

protected $keys;

function __construct(){

$this->appid = "xxx";

$this->mchid = "xxx";

$this->keys = "xxx";

}

public function unifiedorder($data){

$parameters = array();

$parameters['appid'] = $this->appid;

$parameters['mch_id'] = $this->mchid;

$parameters['nonce_str'] = $this->getNonceStr();

$parameters['body'] = $data['body'];

$parameters['out_trade_no'] = $this->mchid . date("YmdHis");

$parameters['total_fee'] = $data['total_fee'];

$parameters['spbill_create_ip'] = $_SERVER["REMOTE_ADDR"];

$parameters['notify_url'] = 'http://www.lrfun.com/wxPayCallback.php';

$parameters['trade_type'] = 'JSAPI';

$parameters['openid'] = $data['openid'];//微信用户的openid(前面有发表过如何获取openid的文章，这里不多说了)

$parameters['time_start'] = date("YmdHis");

$parameters['time_expire'] = date("YmdHis", time() + 3600);

$parameters['attach'] = $data['orderId'];//订单ID，用于支付成功后，更新订单状态

$parameters['sign'] = $this->getSign($parameters);

$queryXml = $this->arrayToXml($parameters);

$url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';

$returnData = $this->httpRequest($url, $queryXml);

$result = $this->xmlToArray($returnData);

$jsApiData = $this->getJsApiParameters($result);

return $jsApiData;

}

/***

* 微信支付生成签名

* @parameters 签名数据

* @return 签名字符串

**/

public function getSign($parameters){

ksort($parameters);

$parametersUrl = urldecode(http_build_query($parameters)) .'&key='. $this->keys;

$sign = strtoupper(md5($parametersUrl));

return $sign;

}

/***

* 数组转xml

* @arr 数组

* @return xml

**/

private function arrayToXml($arr){

if(!is_array($arr) || count($arr) <= 0){

exit("数组数据异常！");

}

$xml = "";

foreach ($arr as $key=>$val){

if (is_numeric($val)){

$xml.="".$val."".$key.">";

}else{

$xml.="".$key.">";

}

}

$xml .= "";

return $xml;

}

/***

* POST或GET请求

* @url 请求url

* @data POST数据

* @return

**/

private function httpRequest($url, $data = ""){

$curl = curl_init();

curl_setopt($curl, CURLOPT_URL, $url);

curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);

curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);

if(!empty($data)){ //判断是否为POST请求

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;

}

/***

* XML转数组

* @url XML

* @return 数组

**/

private function xmlToArray($xml){

if(!$xml){

echo "xml数据异常！";

exit;

}

libxml_disable_entity_loader(true);

$arr = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);

return $arr;

}

/***

* 获取jsapi支付参数

* @data 请求微信返回的数据

* @return JSON

**/

private function getJsApiParameters($data){

$timeStamp = time();

$jsapi["appId"] = $this->appid;

$jsapi["nonceStr"] = $this->getNonceStr();

$jsapi["timeStamp"] = "$timeStamp";

$jsapi["signType"] = "MD5";

$jsapi["package"] = "prepay_id=".$data["prepay_id"];

$jsapi["paySign"] = $this->getSign($jsapi);

$jsApiParameters = json_encode($jsapi);

return $jsApiParameters;

}

/***

* 支付成功回调函数

**/

public function callback(){

$callbackXml = file_get_contents('php://input');

$data = json_decode(json_encode(simplexml_load_string($callbackXml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);

$callbackSign = $data['sign'];

unset($data['sign']);

$sign = $this->getSign($data);

if($sign == $callbackSign){

//这里更新你的订单状态

//根据$data['attach']获取订单信息，更新订单状态

$returnXml = '';

echo returnXml;

}

}

/***

* 生成随机数

* @length 随机字符串长度(默认32位)

* @return

**/

private function getNonceStr($length = 32) {

$chars = "abcdefghijklmnopqrstuvwxyz0123456789";

$str = "";

for ( $i = 0; $i < $length; $i++ ) {

$str .= substr($chars, mt_rand(0, strlen($chars)-1), 1);

}

return $str;

}

}

新建index.php，调用代码：

require_once('WxPay.JsApi.php');

$wxPayJsApi = new WxPayJsApi();

$data = array('body'=>'test', 'total_fee'=>1, 'openid'=>'ocjhxwYwEXlagni-n21fdNArvYWk', 'orderId'=>'168');

$parameters = $wxPayJsApi->unifiedorder($data);

?>

微信JSAPI支付样例

//调用微信JS api 支付

function jsApiCall()

{

WeixinJSBridge.invoke(

'getBrandWCPayRequest',

<?php echo $parameters; ?>,

function(res){

WeixinJSBridge.log(res.err_msg);

alert(res.err_code+res.err_desc+res.err_msg);

}

);

}

function callpay()

{

if (typeof WeixinJSBridge == "undefined"){

if( document.addEventListener ){

document.addEventListener('WeixinJSBridgeReady', jsApiCall, false);

}else if (document.attachEvent){

document.attachEvent('WeixinJSBridgeReady', jsApiCall);

document.attachEvent('onWeixinJSBridgeReady', jsApiCall);

}

}else{

jsApiCall();

}

}

该笔订单支付金额为1分钱

新建回调文件callback.php：

require_once('WxPay.JsApi.php');

$wxPayJsApi = new WxPayJsApi();

$wxPayJsApi->callback();

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