摘要：網(wǎng)上的很多支付寶支付接入教程都頗為復(fù)雜，且需要配置和引入較多的文件，本人通過整理后給出一個單文件版的，希望可以給各位想接入支付寶支付的帶來些許幫助和借鑒意義。一個文件搞定支付寶系列一個文件搞定微信支付系列環(huán)境依賴以上，且需要開啟服務(wù)服務(wù)。

網(wǎng)上的很多PHP支付寶支付接入教程都頗為復(fù)雜，且需要配置和引入較多的文件，本人通過整理后給出一個單文件版的，希望可以給各位想接入支付寶支付的帶來些許幫助和借鑒意義。

一個PHP文件搞定支付寶系列：https://github.com/dedemao/al...

一個PHP文件搞定微信支付系列：https://github.com/dedemao/we...

PHP5.0以上，且需要開啟CURL服務(wù)、SSL服務(wù)。

1.文件開頭的配置信息必須完善
2.商戶私鑰需填寫對應(yīng)簽名算法類型的私鑰，如何生成密鑰參考：
2.1 https://docs.open.alipay.com/...
2.2 https://docs.open.alipay.com/...

密鑰管理->開放平臺密鑰，填寫添加了電腦網(wǎng)站支付的應(yīng)用的APPID
$returnUrl = "http://www.xxx.com/alipay/return.php";     //付款成功后的同步回調(diào)地址
$notifyUrl = "http://www.xxx.com/alipay/notify.php";     //付款成功后的異步回調(diào)地址
$outTradeNo = uniqid();     //你自己的商品訂單號
$payAmount = 0.01;          //付款金額，單位:元
$orderName = "支付測試";    //訂單標(biāo)題
$signType = "RSA2";       //簽名算法類型，支持RSA2和RSA，推薦使用RSA2
//商戶私鑰，填寫對應(yīng)簽名算法類型的私鑰，如何生成密鑰參考：https://docs.open.alipay.com/291/105971和https://docs.open.alipay.com/200/105310
$saPrivateKey="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";
$aliPay = new AlipayService($appid,$returnUrl,$notifyUrl,$saPrivateKey);
$sHtml = $aliPay->doPay($payAmount,$outTradeNo,$orderName,$returnUrl,$notifyUrl);
echo $sHtml;

class AlipayService
{
    protected $appId;
    protected $returnUrl;
    protected $notifyUrl;
    protected $charset;
    //私鑰值
    protected $rsaPrivateKey;

    public function __construct($appid, $returnUrl, $notifyUrl,$saPrivateKey)
    {
        $this->appId = $appid;
        $this->returnUrl = $returnUrl;
        $this->notifyUrl = $notifyUrl;
        $this->charset = "utf8";
        $this->rsaPrivateKey=$saPrivateKey;
    }
    /**
     * 發(fā)起訂單
     * @param float $totalFee 收款總費用 單位元
     * @param string $outTradeNo 唯一的訂單號
     * @param string $orderName 訂單名稱
     * @param string $notifyUrl 支付結(jié)果通知url 不要有問號
     * @param string $timestamp 訂單發(fā)起時間
     * @return array
     */
    public function doPay($totalFee, $outTradeNo, $orderName, $returnUrl,$notifyUrl)
    {
        //請求參數(shù)
        $requestConfigs = array(
            "out_trade_no"=>$outTradeNo,
            "product_code"=>"FAST_INSTANT_TRADE_PAY",
            "total_amount"=>$totalFee, //單位 元
            "subject"=>$orderName,  //訂單標(biāo)題
        );
        $commonConfigs = array(
            //公共參數(shù)
            "app_id" => $this->appId,
            "method" => "alipay.trade.page.pay",             //接口名稱
            "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 $this->buildRequestForm($commonConfigs);
    }

    /**
     * 建立請求，以表單HTML形式構(gòu)造（默認(rèn)）
     * @param $para_temp 請求參數(shù)數(shù)組
     * @return 提交表單HTML文本
     */
    protected function buildRequestForm($para_temp) {

        $sHtml = "
charset."" method="POST">";
        while (list ($key, $val) = each ($para_temp)) {
            if (false === $this->checkEmpty($val)) {
                $val = str_replace(""","'",$val);
                $sHtml.= "";
            }
        }
        //submit按鈕控件請不要含有name屬性
        $sHtml = $sHtml."
";
        $sHtml = $sHtml."";
        return $sHtml;
    }

    public function generateSign($params, $signType = "RSA") {
        return $this->sign($this->getSignContent($params), $signType);
    }

    protected function sign($data, $signType = "RSA") {
        $priKey=$this->rsaPrivateKey;
        $res = "-----BEGIN RSA PRIVATE KEY-----
" .
            wordwrap($priKey, 64, "
", true) .
            "
-----END RSA PRIVATE KEY-----";

        ($res) or die("您使用的私鑰格式錯誤，請檢查RSA私鑰配置");
        if ("RSA2" == $signType) {
            openssl_sign($data, $sign, $res, version_compare(PHP_VERSION,"5.4.0", "<") ? SHA256 : OPENSSL_ALGO_SHA256); //OPENSSL_ALGO_SHA256是php5.4.8以上版本才支持
        } else {
            openssl_sign($data, $sign, $res);
        }
        $sign = base64_encode($sign);
        return $sign;
    }

    /**
     * 校驗$value是否非空
     *  if not set ,return true;
     *    if is null , return true;
     **/
    protected function checkEmpty($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)) {
                // 轉(zhuǎn)換成目標(biāo)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;
    }

    /**
     * 轉(zhuǎn)換字符集編碼
     * @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, $fileType);
                //$data = iconv($fileType, $targetCharset."http://IGNORE", $data);
            }
        }
        return $data;
    }
}