ThinkPHP实现支付宝接口功能（担保交易），（即时交易）@托米，已经有人发过了。这个不是我写的，是在csdn上看到的，顺便转载过来，有什么问题，可以到原作者博客提问http://blog.csdn.net/ssrc0604hx/article/details/16887607。本人也是为了方便大家，忘各位别喷！！！
开发环境
ThinkPHP 3.1.2 (我用的是标准版）
win7 + Apache2
mysql 5.1
这里说一下数据库的设计。
部署支付宝
我用的是支付宝担保交易（即时到账的门槛有点高=.=).先从支付宝网站下载担保交易的demo（要注意编码，我用的是utf-8）。
前往ThinkPHP目录下的Extend，找到Vendor目录（这个目录是第三方类库的存放目录，如果没有，手动创建一个，要标准版本里面是没有的），然后在Vendor下创建Alipay目录存在支付宝相关的文件。
目录结构如下：
接着修改 alipay.config.php 文件：
支付请求
配置好支付宝后，就可以进行支付请求了。支付宝的示例代码很是详细，很多可以直接用。
首先，创建OrderAction.class.php 来处理订单相关的业务操作。
定义pay方法： /**<br>
<br>
* 支付订单<br>
<br>
*/<br>
<br>
public function pay(){<br>
<br>
$this->checkLogin();<br>
<br>
<br>
<br>
header('Content-type: text/html; charset=utf-8');<br>
<br>
<br>
<br>
$id = args("id", 0);<br>
<br>
<br>
<br>
$DAO = new OrderModel();<br>
<br>
$order = $DAO->where("id=".$id)->find();<br>
<br>
<br>
<br>
$error = "";<br>
<br>
if(!isset($order)){<br>
<br>
$error = "订单不存在";<br>
<br>
}else if($order['status'] == 1){<br>
<br>
$error = "此订单已经完成，无需再次支付！";<br>
<br>
} else if($order['status'] == 2){<br>
<br>
$error = "此订单已经取消，无法支付，请重新下单！";<br>
<br>
}<br>
<br>
if($error != ""){<br>
<br>
$this->_FAIL("系统错误",$error,$this->getErrorLinks());<br>
<br>
return ;<br>
<br>
}<br>
<br>
<br>
<br>
//支付宝<br>
<br>
if($order['payment'] == 'alipay'){<br>
<br>
$this->payWithAlipay($order);<br>
<br>
}<br>
<br>
else if($order['payment'] == 'ecpss'){<br>
<br>
$this->payWithEcpss($order);<br>
<br>
}<br>
<br>
else if($order['payment'] == 'dinpay'){<br>
<br>
$this->payWithDinpay($order);<br>
<br>
}<br>
<br>
}然后再定义 payWithAlipay($order) 方法（根据具体情况修改相关的参数即可）：/**<br>
<br>
* 以支付宝形式支付<br>
<br>
* @param unknown_type $order<br>
<br>
*/<br>
<br>
private function payWithAlipay($order){<br>
<br>
//引入支付宝相关的文件<br>
<br>
require_once(VENDOR_PATH."Alipay/alipay.config.php");<br>
<br>
require_once(VENDOR_PATH."Alipay/lib/alipay_submit.class.php");<br>
<br>
<br>
<br>
//支付类型<br>
<br>
$payment_type = "1";<br>
<br>
//必填，不能修改<br>
<br>
//服务器异步通知页面路径<br>
<br>
$notify_url = C("HOST")."index.php/Order/notifyOnAlipay";<br>
<br>
//页面跳转同步通知页面路径<br>
<br>
$return_url = C("HOST")."index.php/Order";<br>
<br>
//卖家支付宝帐户<br>
<br>
$seller_email = $alipay_config['seller_email'];<br>
<br>
//必填<br>
<br>
//商户订单号, 从订单对象中获取<br>
<br>
$out_trade_no = $order['tradeNo'];<br>
<br>
//商户网站订单系统中唯一订单号，必填<br>
<br>
//订单名称<br>
<br>
$subject = $order['subject'];<br>
<br>
//必填<br>
<br>
//付款金额<br>
<br>
$price = $order['price'];<br>
<br>
//必填<br>
<br>
$body = $order['subject'];<br>
<br>
//商品展示地址<br>
<br>
$show_url = C('HOST');<br>
<br>
<br>
<br>
//构造要请求的参数数组，无需改动<br>
<br>
$parameter = array(<br>
<br>
"service" => "create_partner_trade_by_buyer",<br>
<br>
"partner" => trim($alipay_config['partner']),<br>
<br>
"payment_type"=> $payment_type,<br>
<br>
"notify_url"=> $notify_url,<br>
<br>
"return_url"=> $return_url,<br>
<br>
"seller_email"=> $seller_email,<br>
<br>
"out_trade_no"=> $out_trade_no,<br>
<br>
"subject"=> $subject,<br>
<br>
"price"=> $price,<br>
<br>
"quantity"=> "1",<br>
<br>
"logistics_fee"=> "0.00",<br>
<br>
"logistics_type"=> "EXPRESS",<br>
<br>
"logistics_payment"=> "SELLER_PAY",<br>
<br>
"body"=> $body,<br>
<br>
"show_url"=> $show_url,<br>
<br>
"receive_name"=> "",<br>
<br>
"receive_address"=> "",<br>
<br>
"receive_zip"=> "",<br>
<br>
"receive_phone"=> "",<br>
<br>
"receive_mobile"=> "",<br>
<br>
"_input_charset"=> trim(strtolower($alipay_config['input_charset']))<br>
<br>
);<br>
<br>
<br>
<br>
//建立请求<br>
<br>
$alipaySubmit = new AlipaySubmit($alipay_config);<br>
<br>
$html_text = $alipaySubmit->buildRequestForm($parameter,"get", "去支付");<br>
<br>
<br>
<br>
echo $html_text;<br>
<br>
}支付宝返回处理
最后是支付宝异步通知的处理函数（这里，我只对异步返回作处理）：/**<br>
<br>
* 支付宝异步通知<br>
<br>
*/<br>
<br>
public function notifyOnAlipay(){<br>
<br>
require_once(VENDOR_PATH."Alipay/alipay.config.php");<br>
<br>
require_once(VENDOR_PATH."Alipay/lib/alipay_notify.class.php");<br>
<br>
<br>
<br>
$orderLogDao = new OrderLogModel();<br>
<br>
<br>
<br>
//计算得出通知验证结果<br>
<br>
$alipayNotify = new AlipayNotify($alipay_config);<br>
<br>
$verify_result = $alipayNotify->verifyNotify();<br>
<br>
<br>
<br>
if($verify_result) {//验证成功<br>
<br>
<br>
<br>
//商户订单号<br>
<br>
$out_trade_no = $_POST['out_trade_no'];<br>
<br>
<br>
<br>
//支付宝交易号<br>
<br>
$trade_no = $_POST['trade_no'];<br>
<br>
<br>
<br>
//根据订单号获取订单<br>
<br>
$DAO = new OrderModel();<br>
<br>
$order = $DAO->where("tradeNo='".$out_trade_no."'")->find();<br>
<br>
<br>
<br>
//如果订单不存在，设置为0<br>
<br>
if(!isset($order)){<br>
<br>
$orderId = 0;<br>
<br>
}<br>
<br>
else{<br>
<br>
$orderId = $order['id'];<br>
<br>
}<br>
<br>
<br>
<br>
//交易状态<br>
<br>
$trade_status = $_POST['trade_status'];<br>
<br>
<br>
<br>
$log = "notify from Alipay, trade_status=".$trade_status." alipay sign=".$_POST['sign'];<br>
<br>
$orderLog['order_id'] = $orderId;<br>
<br>
$orderLog['addDate'] = sqlDate();<br>
<br>
<br>
<br>
if($_POST['trade_status'] == 'WAIT_BUYER_PAY') {<br>
<br>
//该判断表示买家已在支付宝交易管理中产生了交易记录，但没有付款<br>
<br>
}<br>
<br>
/*<br>
<br>
* 成功付款后，进行积分操作<br>
<br>
*/<br>
<br>
else if($_POST['trade_status'] == 'WAIT_SELLER_SEND_GOODS') {<br>
<br>
//该判断表示买家已在支付宝交易管理中产生了交易记录且付款成功，但卖家没有发货<br>
<br>
if(isset($order) && $order['status'] == 0){<br>
<br>
$resultInfo = $this->doAfterPaySuccess($DAO, $order);<br>
<br>
<br>
<br>
$log.= $resultInfo;<br>
<br>
}<br>
<br>
}<br>
<br>
else if($_POST['trade_status'] == 'WAIT_BUYER_CONFIRM_GOODS') {<br>
<br>
//该判断表示卖家已经发了货，但买家还没有做确认收货的操作<br>
<br>
}<br>
<br>
else if($_POST['trade_status'] == 'TRADE_FINISHED') {<br>
<br>
//该判断表示买家已经确认收货，这笔交易完成<br>
<br>
}<br>
<br>
else {<br>
<br>
}<br>
<br>
<br>
<br>
/*<br>
<br>
* 保存orderlog<br>
<br>
*/<br>
<br>
$orderLog['log'] = $log;<br>
<br>
<br>
<br>
$orderLogDao->add($orderLog);<br>
<br>
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////<br>
<br>
echo "success"; //返回成功标记给支付宝<br>
<br>
}<br>
<br>
else {<br>
<br>
//验证不通过时，也记录下来<br>
<br>
$orderLog['log'] = "notify from Alipay, 但是验证不通过，sign=".$_POST['sign'];<br>
<br>
$orderLog['order_id'] = -1;<br>
<br>
$orderLog['addDate'] = sqlDate();<br>
<br>
<br>
<br>
$orderLogDao->add($orderLog);<br>
<br>
<br>
<br>
//验证失败<br>
<br>
echo "fail";<br>
<br>
}<br>
<br>
}测试一笔，得到如下的结果：
总结
支付宝的集成还是比较简单的，官方的教程很详细。
这里要注意的是，
1、alipay.config.php 下的 cacert.pem 文件的路径一定要对，之前我没注意这点，结果出来以下的错误：
2、在notify_url中，一定只能返回 "success"或者"fail"，也不能对这个url作登录验证的处理。
3、还要注意对网站订单的反重复处理
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