微信小程序 支付功能实现PHP实例详解

前端代码：

wx.request({

url: 'https://www.yourhost.com/weixin/WeiActivity/payJoinfee',//改成你自己的链接

header: {

'Content-Type': 'application/x-www-form-urlencoded'

},

method:'POST',

success: function(res) {

console.log(res.data);

console.log('调起支付');

wx.requestPayment({

'timeStamp': res.data.timeStamp,

'nonceStr': res.data.nonceStr,

'package': res.data.package,

'signType': 'MD5',

'paySign': res.data.paySign,

'success':function(res){

console.log('success');

wx.showToast({

title: '支付成功',

icon: 'success',

duration: 3000

});

},

'fail':function(res){

console.log('fail');

},

'complete':function(res){

console.log('complete');

}

});

},

fail:function(res){

console.log(res.data)

}

});

后端代码：

//支付费用

public function payJoinfee(){

$appid='wx888888888';

$openid='oCQwY0Q_pzrQpu8888888';

$mch_id='141388888';

$key='9A0A86888888888';

import('Weixin.Lib.WeixinPay');

$weixinpay = new \WeixinPay($appid,$openid,$mch_id,$key);

$return=$weixinpay->pay();

$this->response($return,'json');

}

微信支付类

/*

* 小程序微信支付

*/

class WeixinPay{

protected $appid;

protected $mch_id;

protected $key;

protected $openid;

function __construct($appid,$openid,$mch_id,$key){

$this->appid=$appid;

$this->openid=$openid;

$this->mch_id=$mch_id;

$this->key=$key;

}

public function pay(){

//统一下单接口

$return=$this->weixinapp();

return $return;

}

//统一下单接口

private function unifiedorder(){

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

$parameters=array(

'appid'=>$this->appid,//小程序ID

'mch_id'=>$this->mch_id,//商户号

'nonce_str'=>$this->createNoncestr(),//随机字符串

'body'=>'测试',//商品描述

'out_trade_no'=>'2015450806125346',//商户订单号

'total_fee'=>floatval(0.01*100),//总金额 单位 分

'spbill_create_ip'=>$_SERVER['REMOTE_ADDR'],//终端IP

'notify_url'=>'http://www.weixin.qq.com/wxpay/pay.php',//通知地址

'openid'=>$this->openid,//用户id

'trade_type'=>'JSAPI'//交易类型

);

//统一下单签名

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

$xmlData=arrayToXml($parameters);

$return=xmlToArray(postXmlSSLCurl($xmlData,$url,60));

return $return;

}

//微信小程序接口

private function weixinapp(){

//统一下单接口

$unifiedorder=$this->unifiedorder();

$parameters=array(

'appId'=>$this->appid,//小程序ID

'timeStamp'=>''.time().'',//时间戳

'nonceStr'=>$this->createNoncestr(),//随机串

'package'=>'prepay_id='.$unifiedorder['prepay_id'],//数据包

'signType'=>'MD5'//签名方式

);

//签名

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

return $parameters;

}

//作用：产生随机字符串，不长于32位

private function createNoncestr($length = 32 ){

$chars = "abcdefghijklmnopqrstuvwxyz0123456789";

$str ="";

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

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

}

return $str;

}

//作用：生成签名

private function getSign($Obj){

foreach ($Obj as $k => $v){

$Parameters[$k] = $v;

}

//签名步骤一：按字典序排序参数

ksort($Parameters);

$String = $this->formatBizQueryParaMap($Parameters, false);

//签名步骤二：在string后加入KEY

$String = $String."&key=".$this->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_;

}

///作用：格式化参数，签名过程需要使用

private function formatBizQueryParaMap($paraMap, $urlencode){

$buff = "";

ksort($paraMap);

foreach ($paraMap as $k => $v){

if($urlencode)

{

$v = urlencode($v);

}

$buff .= $k . "=" . $v . "&";

}

$reqPar;

if (strlen($buff) > 0){

$reqPar = substr($buff, 0, strlen($buff)-1);

}

return $reqPar;

}

}

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