PHP整合PayPal支付

简单整理一下PHP项目整合PayPal支付功能。

一、表单的构建：

<form method="post" name="form" action="https://www.paypal.com/cgi-bin/webscr">

<input type="hidden" name="rm" value="2"/>

<input type="hidden" name="cmd" value="_xclick"/>

<input type="hidden" name="business" value="商家账号"/>

<input type="hidden" name="return" value="返回网址"/>

<input type="hidden" name="cancel_return" value="取消返回网址"/>

<input type="hidden" name="notify_url" value="用于接收PayPal发送的即时付款通知的URL，必须是有效的URL"/>

<input type="hidden" name="item_name" value="物品名称"/>

<input type="hidden" name="item_number" value="可用于跟踪购买或捐赠的传递变量，在付款完成时传回给您"/>

<input type="hidden" name="amount" value="物品的价格（购物车中所有物品的总价格"/>

<input type="hidden" name="currency_code" value="币种"/>

</form>

二、IPN验证部分

<?php

class paypal {

var $ipn_data = array(); // array contains the POST values for IPN

var $fields = array(); // 提交给Paypal的表单参数，例：item_name=iPhone 6,quantity=1,amount=499,currency_code=USD等所有表单信息，

//　在调用验证IPN之前事先需要初始化好

var $paypal_url = 'https://www.paypal.com/cgi-bin/webscr';//sandbox：https://www.sandbox.paypal.com/cgi-bin/webscr

function validate_ipn() {//验证IPN

// parse the paypal URL

$url_par=parse_url($this->paypal_url);

// generate the post string from the _POST vars aswell as load the

// _POST vars into an arry so we can play with them from the calling

// script.

$post_str = '';

foreach ($_POST as $field=>$value) {

$this->ipn_data["$field"] = $value;

$post_str .= $field.'='.urlencode(stripslashes($value)).'&';

}

$post_str.="cmd=_notify-validate"; // append ipn command

// open the connection to paypal

$fp = fsockopen($url_par[host],"80",$errnum,$errstr,30);

if(!$fp) {

// could not open the connection.

return false;

} else {

// Post the data back to paypal

fputs($fp, "POST ".$url_par[path]." HTTP/1.1rn");

fputs($fp, "Host: ".$url_par[host]."rn");

fputs($fp, "Content-type: application/x-www-form-urlencodedrn");

fputs($fp, "Content-length: ".strlen($post_str)."rn");

fputs($fp, "Connection: closernrn");

fputs($fp, $post_str . "rnrn");

// loop through the response from the server and append to variable

while(!feof($fp)) {

$this->validate_ipn_response .= fgets($fp, 1024);

}

fclose($fp); // close connection

}

if (eregi("VERIFIED",$this->validate_ipn_response)) {

return true;

} else {

return false;

}

}

}

?>

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