php 微信 统一下单 接口实例

<?php

class wechatAppPay

{ 

//接口API URL前缀

const API_URL_PREFIX = 'https://api.mch.weixin.qq.com';

//下单地址URL

const UNIFIEDORDER_URL = "/pay/unifiedorder";

//查询订单URL

const ORDERQUERY_URL = "/pay/orderquery";

//关闭订单URL

const CLOSEORDER_URL = "/pay/closeorder";

//公众账号ID

private $appid;

//商户号

private $mch_id;

//随机字符串

private $nonce_str;

//签名

private $sign;

//商品描述

private $body;

//商户订单号

private $out_trade_no;

//支付总金额

private $total_fee;

//终端IP

private $spbill_create_ip;

//支付结果回调通知地址

private $notify_url;

//交易类型

private $trade_type;

//支付密钥

private $key;

//证书路径

private $SSLCERT_PATH;

private $SSLKEY_PATH;

//所有参数

private $params = array();

public function __construct($appid, $mch_id, $notify_url, $key)

{

$this->appid = $appid;

$this->mch_id = $mch_id;

$this->notify_url = $notify_url;

$this->key = $key;

}

/**

* 下单方法

* @param $params 下单参数

*/

public function unifiedOrder( $params ){

$this->body = $params['body'];

$this->out_trade_no = $params['out_trade_no'];

$this->total_fee = $params['total_fee'];

$this->trade_type = $params['trade_type'];

$this->nonce_str = $this->genRandomString();

$this->spbill_create_ip = $_SERVER['REMOTE_ADDR'];

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

$this->params['mch_id'] = $this->mch_id;

$this->params['nonce_str'] = $this->nonce_str;

$this->params['body'] = $this->body;

$this->params['out_trade_no'] = $this->out_trade_no;

$this->params['total_fee'] = $this->total_fee;

$this->params['spbill_create_ip'] = $this->spbill_create_ip;

$this->params['notify_url'] = $this->notify_url;

$this->params['trade_type'] = $this->trade_type;

//获取签名数据

$this->sign = $this->MakeSign( $this->params );

$this->params['sign'] = $this->sign;

$xml = $this->data_to_xml($this->params);

$response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::UNIFIEDORDER_URL);

if( !$response ){

return false;

}

$result = $this->xml_to_data( $response );

if( !empty($result['result_code']) && !empty($result['err_code']) ){

$result['err_msg'] = $this->error_code( $result['err_code'] );

}

return $result;

}

/**

* 查询订单信息

* @param $out_trade_no 订单号

* @return array

*/

public function orderQuery( $out_trade_no ){

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

$this->params['mch_id'] = $this->mch_id;

$this->params['nonce_str'] = $this->genRandomString();

$this->params['out_trade_no'] = $out_trade_no;

//获取签名数据

$this->sign = $this->MakeSign( $this->params );

$this->params['sig
4000
n'] = $this->sign;

$xml = $this->data_to_xml($this->params);

$response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::ORDERQUERY_URL);

if( !$response ){

return false;

}

$result = $this->xml_to_data( $response );

if( !empty($result['result_code']) && !empty($result['err_code']) ){

$result['err_msg'] = $this->error_code( $result['err_code'] );

}

return $result;

}

/**

* 关闭订单

* @param $out_trade_no 订单号

* @return array

*/

public function closeOrder( $out_trade_no ){

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

$this->params['mch_id'] = $this->mch_id;

$this->params['nonce_str'] = $this->genRandomString();

$this->params['out_trade_no'] = $out_trade_no;

//获取签名数据

$this->sign = $this->MakeSign( $this->params );

$this->params['sign'] = $this->sign;

$xml = $this->data_to_xml($this->params);

$response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::CLOSEORDER_URL);

if( !$response ){

return false;

}

$result = $this->xml_to_data( $response );

return $result;

}

/**

* 

* 获取支付结果通知数据

* return array

*/

public function getNotifyData(){

//获取通知的数据

$xml = $GLOBALS['HTTP_RAW_POST_DATA'];

$data = array();

if( empty($xml) ){

return false;

}

$data = $this->xml_to_data( $xml );

if( !empty($data['return_code']) ){

if( $data['return_code'] == 'FAIL' ){

return false;

}

}

return $data;

}

/**

* 接收通知成功后应答输出XML数据

* @param string $xml

*/

public function replyNotify(){

$data['return_code'] = 'SUCCESS';

$data['return_msg'] = 'OK';

$xml = $this->data_to_xml( $data );

echo $xml;

die();

}

/**

* 生成APP端支付参数

* @param $prepayid 预支付id

*/

public function getAppPayParams( $prepayid ){

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

$data['partnerid'] = $this->mch_id;

$data['prepayid'] = $prepayid;

$data['package'] = 'Sign=WXPay';

$data['noncestr'] = $this->genRandomString();

$data['timestamp'] = time();

$data['sign'] = $this->MakeSign( $data ); 

return $data;

}

/**

* 生成签名

* @return 签名

*/

public function MakeSign( $params ){

//签名步骤一：按字典序排序数组参数

ksort($params);

$string = $this->ToUrlParams($params);

//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;

}

/**

* 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;

}

/**

* 输出xml字符

* @param $params 参数名称

* return string 返回组装的xml

**/

public function data_to_xml( $params ){

if(!is_array($params)|| count($params) <= 0)

{

return false;

}

$xml = "<xml>";

foreach ($params as $key=>$val)

{

if (is_numeric($val)){

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

}else{

$xml.="<".$key."><![CDATA[".$val."]]></".$key.">";

}

}

$xml.="</xml>";

return $xml; 

}

/**

* 将xml转为array

* @param string $xml

* return array

*/

public function xml_to_data($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;

}

/**

* 获取毫秒级别的时间戳

*/

private static function getMillisecond(){

//获取毫秒的时间戳

$time = explode ( " ", microtime () );

$time = $time[1] . ($time[0] * 1000);

$time2 = explode( ".", $time );

$time = $time2[0];

return $time;

}

/**

* 产生一个指定长度的随机字符串,并返回给用户 

* @param type $len 产生字符串的长度

* @return string 随机字符串

*/

private function genRandomString($len = 32) {

$chars = array(

"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",

"l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",

"w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G",

"H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",

"S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2",

"3", "4", "5", "6", "7", "8", "9"

);

$charsLen = count($chars) - 1;

// 将数组打乱 

shuffle($chars);

$output = "";

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

$output .= $chars[mt_rand(0, $charsLen)];

}

return $output;

}

/**

* 以post方式提交xml到对应的接口url

* 

* @param string $xml 需要post的xml数据

* @param string $url url

* @param bool $useCert 是否需要证书，默认不需要

* @param int $second url执行超时时间，默认30s

* @throws WxPayException

*/

private function postXmlCurl($xml, $url, $useCert = false, $second = 30){ 

$ch = curl_init();

//设置超时

curl_setopt($ch, CURLOPT_TIMEOUT, $second);

curl_setopt($ch,CURLOPT_URL, $url);

curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);

curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);

//设置header

curl_setopt($ch, CURLOPT_HEADER, FALSE);

//要求结果为字符串且输出到屏幕上

curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

if($useCert == true){

//设置证书

//使用证书：cert 与 key 分别属于两个.pem文件

curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');

//curl_setopt($ch,CURLOPT_SSLCERT, WxPayConfig::SSLCERT_PATH);

curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');

//curl_setopt($ch,CURLOPT_SSLKEY, WxPayConfig::SSLKEY_PATH);

}

//post提交方式

curl_setopt($ch, CURLOPT_POST, TRUE);

curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);

//运行curl

$data = curl_exec($ch);

//返回结果

if($data){

curl_close($ch);

return $data;

} else { 

$error = curl_errno($ch);

curl_close($ch);

return false;

}

}

/**

* 错误代码

* @param $code 服务器输出的错误代码

* return string

*/

public function error_code( $code ){

$errList = array(

'NOAUTH' => '商户未开通此接口权限',

'NOTENOUGH' => '用户帐号余额不足',

'ORDERNOTEXIST' => '订单号不存在',

'ORDERPAID' => '商户订单已支付，无需重复操作',

'ORDERCLOSED' => '当前订单已关闭，无法支付',

'SYSTEMERROR' => '系统错误!系统超时',

'APPID_NOT_EXIST' => '参数中缺少APPID',

'MCHID_NOT_EXIST' => '参数中缺少MCHID',

'APPID_MCHID_NOT_MATCH' => 'appid和mch_id不匹配',

'LACK_PARAMS' => '缺少必要的请求参数',

'OUT_TRADE_NO_USED' => '同一笔交易不能多次提交',

'SIGNERROR' => '参数签名结果不正确',

'XML_FORMAT_ERROR' => 'XML格式错误',

'REQUIRE_POST_METHOD' => '未使用post传递参数 ',

'POST_DATA_EMPTY' => 'post数据不能为空',

'NOT_UTF8' => '未使用指定编码格式',

); 

if( array_key_exists( $code , $errList ) ){

return $errList[$code];

}

}

}
 
使用的方法
<?php

include 'wechatAppPay.class.php';

//1.统一下单方法

$wechatAppPay = new wechatAppPay($appid, $mch_id, $notify_url, $key);

$params['body'] = '商品描述'; //商品描述

$params['out_trade_no'] = 'O20160617021323-001'; //自定义的订单号

$params['total_fee'] = '100'; //订单金额 只能为整数 单位为分

$params['trade_type'] = 'APP'; //交易类型 JSAPI | NATIVE | APP | WAP 

$result = $wechatAppPay->unifiedOrder( $params );

print_r($result); // result中就是返回的各种信息信息，成功的情况下也包含很重要的prepay_id

//2.创建APP端预支付参数

/** @var TYPE_NAME $result */

$data = @$wechatAppPay->getAppPayParams( $result['prepay_id'] );

// 根据上行取得的支付参数请求支付即可

print_r($data);

?>