两个php搞定支付宝当面付(亲测可用)

最近在集成一个小项目的支付功能，想到之前以及集成好了支付宝，直接拿过来用，但是那个包含的文件太多了，全部都是基于官方的sdk的，引入支付宝封装好的AOP框架，调用起来异常简单，但为了更清楚的了解核心步骤，特此整理了一个单文件版本的当面付!

/**
 * 单个文件实现支付宝当面
 * Class AliFacePayService
 */
class AliFacePayService
{
    protected $appId;
    protected $notifyUrl;
    protected $rsaPrivateKey;
    protected $charset;

    public function __construct($appid, $notifyUrl, $saPrivateKey)
    {
        $this->appId = $appid;
        $this->notifyUrl = $notifyUrl;
        $this->charset = 'utf8';
        $this->rsaPrivateKey = $saPrivateKey;
    }

    /**
     * 发起订单
     * home.php?mod=space&uid=952169 float $totalFee 收款总费用 单位元
     * @param string $outTradeNo 唯一的订单号
     * @param string $title 订单名称
     * @param string $notifyUrl 支付结果通知url 不要有问号
     * home.php?mod=space&uid=155549 array
     */
    public function doPay($totalFee, $outTradeNo, $title, $notifyUrl)
    {
        //请求参数
        $requestConfigs = [
            'out_trade_no' => $outTradeNo,
            'total_amount' => $totalFee, //单位 元
            'subject' => $title,  //订单标题
        ];
        $commonConfigs = [
            //公共参数
            'app_id' => $this->appId,
            'method' => 'alipay.trade.precreate',
            'format' => 'JSON',
            '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']);
        $result = $this->curlPost('https://openapi.alipay.com/gateway.do', $commonConfigs);

        return json_decode($result, true);
    }

    /**
     * 根据签名类型生成签名
     * @param $params
     * @param string $signType
     * @return string
     */
    public function generateSign($params, $signType = "RSA")
    {
        return $this->sign($this->getSignContent($params), $signType);
    }

    /**
     * 生成签名
     * @param $data
     * @param string $signType
     * @return string
     */
    protected function sign($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, $res, version_compare(PHP_VERSION, '5.4.0', '<') ? SHA256 : OPENSSL_ALGO_SHA256); //OPENSSL_ALGO_SHA256是php5.4.8以上版本才支持
        } else {
            openssl_sign($data, $sign, $res);
        }
        $sign = base64_encode($sign);
        return $sign;
    }

    /**
     * 校验参数是否为空
     * @param $value
     * @return bool
     */
    protected function checkEmpty($value)
    {
        return empty($value) == true;
    }

    /**
     * 获取待签名的字符串
     * @param $params
     * @return string
     */
    public function getSignContent($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 = $this->transCoding($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 $targetCharset
     * @return string
     */
    function transCoding($data, $targetCharset)
    {
        if (!empty($data)) {
            $fileType = $this->charset;
            if (strcasecmp($fileType, $targetCharset) != 0) {
                $data = mb_convert_encoding($data, $targetCharset, $fileType);
            }
        }
        return $data;
    }

    /**
     * curl请求，注意https如果没有证书，需要设置不验证证书和host
     * @param string $url
     * @param string $postData
     * @param array $options
     * @param bool $isssl
     * @return mixed
     */
    public function curlPost($url = '', $postData = '', $options = [], $isssl = true)
    {
        if (is_array($postData)) {
            $postData = http_build_query($postData);
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        if (!empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https请求 不验证证书和host
        if ($isssl) {
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        }
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }
}

调用：

header('Content-type:text/html; Charset=utf-8');
$appid = '';  //应用id，支付宝后台自行查看
$notifyUrl = '';     //付款成功后的支付宝通知你的回调地址
$outTradeNo = rand(1000, 9999) . uniqid() . rand(1000, 9999);     //订单号，自行实现不重复订单号的生成。
$payAmount = 1;          //付款金额，单位:元，微信最小单位为分，支付宝是元，且只能保留两位小数。
$title = '当面付支付测试';    //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 = 'MIIEvwIBADANBgkqhkiG9w0BAQEFAASCBKkwggSlAgEAAoIBAQCJEEJIXqigyN9ra8jdgRWG9JVK/HqRrsAUoUcSklcjDID4LK824TtmFedCi5eKrEnsqw5phmlCZA/3YprzHj/uORhEZ6C/TroCoFsUJ1XaIbwDgGRimX9fv1N6HpyNeZAePsfE1Ec3g8Vm3x7BbkgfTgw1k5/Flu94SYL4fnjygB08k/tsyYF0OBFoJfm0OJXS+fjr8eiThtRzVFRch4jeBsgk3L80dl1cbdSLuLBesRMLB6SvznLv5I742OKAdMjYQmv+nAEGo7WjCbSGslRBkXzP6gASuPr2C4X/mhXOLtfs2h904w9Lzep5PxLrtFakCDNTn+7+4sytdqSmdRO1AgMBAAECggEAbz0v3lZc22lL0n3+3q72DrqQM/SncXb3U4b1DMCSUdLDFSgG6C5yK88ZCqwKSLS9poPJxaEd6pEVWDzB7xCc6DWUWWgVUU6OrrUAVmH6TnfUhK7+Sfu0IbxA/rq7aiK/8ZwYO8nhJtAeNPhemLRtemK4i/8My6tNHT3kOtNCS+SwGFcfW9+dE5InJmIE+f6UTbTrHk1719XwXV9NjWx+IsFI7XgWhfHmbga4WKJyj4w874rPvv8APxkamliQCefz++pX9v7ySAbTDf1NAd72m2Q1YZTMO1w56emixFwlzvvs+PYTS/m3hRmKaRxJMP+Gpa2bYQyr0XtenSGksxfmnQKBgQDsHX7WcWLg9SrwLCZVBshiMzbU3vZdxM+xDzsACSxnTvH4Jlib8c0vfv01NwiLUcQ+X4seGvR3T6L0sNAWLZyMSMzvCTT6YqUAVB4BE2n4BuT6M/jxv/2/XD6mYvkTuLVq792U6dqTp5RYKMZLIQDkZlCCHvQBg/tdlRraSleaHwKBgQCUm0Ro6cBsfZxwYconhjqMp27jwKA4G8mTc4CRs98RXxucKLsrfs1o6Vsz3531zkyLiD3qnwDdvc+1a3x/IUtsI0UqeeVVNCizlNBR12JUPOTAYWoUkxROYC+L/sMaURvmNG6r1GmWk3mrQJccVMr24xeE7rChcDkYmkjxh4y/qwKBgQDRbBfj/A3HmazL+VzGbY2uC97GUDwUT0wnr2qVTY2k09CqWNie+IkVZ30OhhF+ALge2n955E6QxIG0pl7qTOpdQvUBzxi+PGA9Ol6idaW35+WQRii3w6I86IRo78AcTegbQUU3n3PPIwPgbcnzOQKhkl42C15BOd7p0iZPF0E74QKBgQCKg4bqOybueM5+OcgRux2LyOylQQCWC+CBneEy7fN336x+i8CaNCEGLqyh10cGvHnAfQcpT3ehN7EJKtzqKoCAlQd9Jg1Ks8lUSds6zYWLew7E+ofEEauVujXXSWlVeFCG7ExTwTOB9IgtxZCUCbz9DoL3lvvwHgg6FGT1LCFW7QKBgQCob9v7M/DGXvRprNPyXKWZsibH+DxhEWB4Hth8gCRvRlYGQ6Nj/hakymjN2haC7S4hTuztbbGTGgfQSdmA2NlRVGbTGKws07EpoeDbeL40mY6IiFNCEtboLoZaX/WQxv1v7vnTVaGwZE94Xeibiq35/hL8iM3LJkjDJFFhFJ5cjQ==';
$aliPay = new AliFacePayService($appid, $notifyUrl, $saPrivateKey);
$result = $aliPay->doPay($payAmount, $outTradeNo, $title, $notifyUrl);
$result = $result['alipay_trade_precreate_response'];

if ($result['code'] && $result['code'] == '10000') {
    //生成的二维码实际是 $result['qr_code']，前面拼接的博客地址需要删除，如果是前端处理，需要把这个链接地址传给前端，前端使用js渲染成二维码
    $url = 'https://blog.csdn.net/abc8125/article/details/111397300?params=' . $result['qr_code'];
    //后端处理直接把二维码链接转为图片
    $url = urldecode($result['qr_code']);//生成二维码
    QRcode::png($url);
} else {
    echo $result['msg'] . ' : ' . $result['sub_msg'];
}

把支付链接转为二维码图片：

https://github.com/wmlc/phpqrcode

需要接入php的qrcode库，也只有一个文件，具体还可以通过这个库给二维码增加logo以及一些自定义的东西。

完整代码