微信APP统一下单

一、

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['sign'] = $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;
		}
			$xml = "";
			foreach ($params as $key=>$val)
			{
				if (is_numeric($val)) {
					$xml.="<".$key.">".$val."";
				} else {
					$xml.="<".$key.">";
				}
			}
		$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];
		}
	}
} 

二、调用方法

//微信统一下单
function WxPay($new_order_id, $goods_amount) 
{
	$appid = 'wxd1277bc5eb******';
	$mch_id = '1489436152';
	$notify_url = 'www.bhr.com/mapi/flows.php?act=notify';
	$key = '8f4f4bd12554b11f1cd7058c32******';
	//1.统一下单方法
	$wechatAppPay = new wechatAppPay($appid, $mch_id, $notify_url, $key);
	$goods_amount = $goods_amount*100;
	$params['body'] = '商品描述'; //商品描述
	$params['out_trade_no'] = "$new_order_id"; //自定义的订单号
	$params['total_fee'] = "$goods_amount"; //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 ); // res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
	$data = $wechatAppPay->getAppPayParams( $result['prepay_id'] );//2.创建APP端预支付参数
	return $data;
}