网上的很多PHP支付宝支付接入教程都颇为复杂，且需要配置和引入较多的文件，本人通过整理后给出一个单文件版的，希望可以给各位想接入支付宝支付的带来些许帮助和借鉴意义。

推荐：《PHP视频教程》

一个PHP文件搞定支付宝系列：https://github.com/dedemao/alipay

一个PHP文件搞定微信支付系列：https://github.com/dedemao/weixinPay

在手机浏览器下打开实现效果

在微信中打开实现效果

注：兼容微信浏览器需依赖支付宝官方提供的demo(alipay_in_weixin_demo)中的两个文件，即：ap.js及pay.htm

环境依赖

PHP5.0以上，且需要开启CURL服务、SSL服务。

如需兼容微信浏览器，还需依赖ap.js及pay.htm。

注意事项

1.文件开头的配置信息必须完善

2.商户私钥需填写对应签名算法类型的私钥，如何生成密钥参考：

2.1 https://docs.open.alipay.com/291/105971

2.2 https://docs.open.alipay.com/200/105310

代码<?php

header('Content-type:text/html; Charset=utf-8');

$appid = 'xxxxx'; //https://open.alipay.com 账户中心->密钥管理->开放平台密钥，填写添加了电脑网站支付的应用的APPID

$returnUrl = 'http://www.xxx.com/alipay/return.php'; //付款成功后的同步回调地址

$notifyUrl = 'http://www.xxx.com/alipay/notify.php'; //付款成功后的异步回调地址

$outTradeNo = uniqid(); //你自己的商品订单号

$payAmount = 0.01; //付款金额，单位:元

$orderName = '支付测试'; //订单标题

$signType = 'RSA2'; //签名算法类型，支持RSA2和RSA，推荐使用RSA2

//商户私钥，填写对应签名算法类型的私钥，如何生成密钥参考：https://docs.open.alipay.com/291/105971和https://docs.open.alipay.com/200/105310

$saPrivateKey='MIIEpAIBAAKCAQEA1MV+OY6MvGfXPM0MkpjT+FdzGmPOvVmX2wF3gjwQpeHBEUP9jLXhVS32fZ1iXI1e7WUGQ5tvXn28P8190kpOn/c/G5t2CAksUvemvF7uJN/N3Z1HFMdt3omvCd14K05lgcFYz7Z4c+A7ZJF5bPCB6oshjjUmbCY3hibuWzX/1j8AgsoD9lLyxoFqxLj98k5ZrYIhk900gMQs/WJ3A1FC09Dln9fuhBUyjtPHaml+4w+sdkdzxPktxdFrMcI7M7rNEwg25XtST5Z49oFpE84AlXM7+oC9jYvIpTGE00WomsgtakN039ucT/59Bup6pLkO08Rv85UXbqzGTcYAhNHLfQIDAQABAoIBAQCbuPM58s+j8KgB8ty5yiqRPoeaj+O2h4Txn7A02/sfPQvNtCI0wsTpT5twsihULo+EVYTxJCitUn7df2sP5pyGzTEd5njLRtNu4Zvhj+Thjf1grERiu9b4oXI/WRzjLRxzi+uREi40OK+fWi0xgxDCdROY/eNiEdJfV8zpaqsUxG7VdwZIJQ/8d3Mi31OWv30kr9jfEd15DBInGJgSqR+qwrAB4pBSMcW8hL6PYlzoPi1ygceFjRrnbeMG40zt0OUPSexQIgAmFvGqxTl5xo3dFEziGHdfWYsBKZ2M8ubAe+R6LcndxI+o2Hw4TNcC1tDeNMtjw7+h9S5aef5A8uWBAoGBAPxCLWPhUHCYlIXUz0D1SoolZs9WK7Kz1YSWnzqrpegN+foS5/ji93YylGE+KL31TwbnGQLAwknwMX3qTzmkvTovmy8jevXBsCSEFm81q0wG/35e1SKkTXL66RqB2y0xFLdcF3f9s8ZiEclqkYwNSHh0nqzREfIxMMAsj+3n2vHdAoGBANftYkZYrbs4iI/ZcjmBYguYikNfNmrD+Ta6ckOGZqsHfwXJCAz1rF4/XCqVAc9nxuzJR/72qkn9z07uH6qSZCqlZDRki2KaK2UVqFDB+0abMk/TGHXuMmdvMkyj2jEZxG2rkg0kmg4qYkkg/5tGG1On/0GeZNVPu8JpsFr1pDYhAoGBANr8pCTKC6fDfWP1C3qrtmrY7zhc6RB4d4pjq5UmP5+EypaiZQi2F/dfD1qfuIS3eURXyGmQZtoDDyPtDZvP/ImPnFs+pNbFryD0HfmrEKquhIvyzXoGQknnsgbV5iyEKCTJaII9FxzINAKzZei7+0a+jqUd1kN3Gogp50Sze2ltAoGARaM5Xpaa8RZ6dGocfI9Nn4/Ch5fdZPFvHkdjMoPV+LKiNKtw/Tz+KiclAlasDsfZT+RaY9AJe3NvuHTzoX807swIVR1Xr3EpLaCed+0XrN3AjB34dZAskU87WZw+cjdtMjFzGOoFBSyGJi+OP/WMOp6jo/YBbwoX88tCJROzsgECgYAT8pHHIyPt5Y/5pDb8EDvD3XNES1fBkfZffSoAodsrkeoKgrsKl+9M3rcGX+S9dscyoH0ur3BFTMHtIOOhC5qytt+BhMHIP5mAs4di4u/joQCWQbUyrUggVK5it+6BFgAT+jeB7zTAUtgGpTVFq3kLbV0NZ+XQyEHVlnoJnHYpQg==';

$aliPay = new AlipayService($appid,$returnUrl,$notifyUrl,$saPrivateKey);

$payConfigs = $aliPay->doPay($payAmount,$outTradeNo,$orderName,$returnUrl,$notifyUrl);

class AlipayService

{

protected $appId;

protected $returnUrl;

protected $notifyUrl;

protected $charset;

//私钥值

protected $rsaPrivateKey;

public function __construct($appid, $returnUrl, $notifyUrl,$saPrivateKey)

{

$this->appId = $appid;

$this->returnUrl = $returnUrl;

$this->notifyUrl = $notifyUrl;

$this->charset = 'utf8';

$this->rsaPrivateKey=$saPrivateKey;

}

/**

* 发起订单

* @param float $totalFee 收款总费用 单位元

* @param string $outTradeNo 唯一的订单号

* @param string $orderName 订单名称

* @param string $notifyUrl 支付结果通知url 不要有问号

* @param string $timestamp 订单发起时间

* @return array

*/

public function doPay($totalFee, $outTradeNo, $orderName, $returnUrl,$notifyUrl)

{

//请求参数

$requestConfigs = array(

'out_trade_no'=>$outTradeNo,

'product_code'=>'QUICK_WAP_WAY',

'total_amount'=>$totalFee, //单位 元

'subject'=>$orderName, //订单标题

);

$commonConfigs = array(

//公共参数

'app_id' => $this->appId,

'method' => 'alipay.trade.wap.pay', //接口名称

'format' => 'JSON',

'return_url' => $returnUrl,

'charset'=>$this->charset,

'sign_type'=>'RSA2',

'timestamp'=>date('Y-m-d H:i:s'),

'version'=>'1.0',

'notify_url' => $notifyUrl,

'biz_content'=>json_encode($requestConfigs),

);

$commonConfigs["sign"] = $this->generateSign($commonConfigs, $commonConfigs['sign_type']);

return $commonConfigs;

}

public function generateSign($params, $signType = "RSA") {

return $this->sign($this->getSignContent($params), $signType);

}

protected function sign($data, $signType = "RSA") {

$priKey=$this->rsaPrivateKey;

$res = "-----BEGIN RSA PRIVATE KEY-----\n" .

wordwrap($priKey, 64, "\n", true) .

"\n-----END RSA PRIVATE KEY-----";

($res) or die('您使用的私钥格式错误，请检查RSA私钥配置');

if ("RSA2" == $signType) {

openssl_sign($data, $sign, $res, version_compare(PHP_VERSION,'5.4.0', '

} else {

openssl_sign($data, $sign, $res);

}

$sign = base64_encode($sign);

return $sign;

}

/**

* 校验$value是否非空

* if not set ,return true;

* if is null , return true;

**/

protected function checkEmpty($value) {

if (!isset($value))

return true;

if ($value === null)

return true;

if (trim($value) === "")

return true;

return false;

}

public function getSignContent($params) {

ksort($params);

$stringToBeSigned = "";

$i = 0;

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

if (false === $this->checkEmpty($v) && "@" != substr($v, 0, 1)) {

// 转换成目标字符集

$v = $this->characet($v, $this->charset);

if ($i == 0) {

$stringToBeSigned .= "$k" . "=" . "$v";

} else {

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

}

$i++;

}

}

unset ($k, $v);

return $stringToBeSigned;

}

/**

* 转换字符集编码

* @param $data

* @param $targetCharset

* @return string

*/

function characet($data, $targetCharset) {

if (!empty($data)) {

$fileType = $this->charset;

if (strcasecmp($fileType, $targetCharset) != 0) {

$data = mb_convert_encoding($data, $targetCharset, $fileType);

}

}

return $data;

}

}

function isWeixin(){

if ( strpos($_SERVER['HTTP_USER_AGENT'],'MicroMessenger') !== false ) {

return true;

}

return false;

}

$queryStr = http_build_query($payConfigs);

if(isWeixin()):

?>

var gotoUrl = 'https://openapi.alipay.com/gateway.do?=$queryStr?>';

_AP.pay(gotoUrl);

else:

header("Location:https://openapi.alipay.com/gateway.do?{$queryStr}");

endif;

?>