小程序端

调用wx.requestPayment,所需要的参数都从服务端获取

服务端

小程序需要的参数:

小程序端需要的参数需要从服务端获取,这样签名才能一致


 /**
     * 随机数
     * @param $length
     * @param int $numeric
     * @return string
     */
    public function random($length, $numeric = 0)
    {
        PHP_VERSION < '4.2.0' ? mt_srand((double)microtime() * 1000000) : mt_srand();
        $seed = base_convert(md5(print_r($_SERVER, 1) . microtime()), 16, $numeric ? 10 : 35);
        $seed = $numeric ? (str_replace('0', '', $seed) . '012340567890') : ($seed . 'zZ' . strtoupper($seed));
        $hash = '';
        $max = strlen($seed) - 1;
        for ($i = 0; $i < $length; $i++) {
            $hash .= $seed[mt_rand(0, $max)];
        }
        return $hash;
    }

    public function paysing()
    {
        $appid='';
        $key='';//商户的api密钥
        $nonce_str=$this->random(15);//随机数,可自己写个方法生成
        $prepay_id=$this->post->prepay_id;
        $timestamp=time();
        $paySign = MD5("appId=$appid&nonceStr=$nonce_str&package=prepay_id=$prepay_id&signType=MD5&timeStamp=$timestamp&key=$key");
        $json = array();
        $json['paysign'] = strtoupper($paySign);
        $json['timeStamp'] = $timestamp.'';
        $json['nonceStr'] = $nonce_str;
        $json['package'] ='prepay_id='.$prepay_id;

        return $this->enJson(200,'获取成功',$json);
    }

工具类

注意:小程序支付需要额外的参数openid,所以我复制了工具类下单的方法,unifiedOrder2

payapi.php

<?php
class wechatAppPay
{
//接口API URL前缀
    const API_URL_PREFIX = 'https://api.mch.weixin.qq.com';
//下单地址URL
    const UNIFIEDORDER_URL = "/pay/unifiedorder";
//查询订单URL
    const ORDERQUERY_URL = "/pay/orderquery";
//关闭订单URL
    const CLOSEORDER_URL = "/pay/closeorder";
//公众账号ID
    private $appid;
//商户号
    private $mch_id;
//随机字符串
    private $nonce_str;
//签名
    private $sign;
//商品描述
    private $body;
//商户订单号
    private $out_trade_no;
//支付总金额
    private $total_fee;
//终端IP
    private $spbill_create_ip;
//支付结果回调通知地址
    private $notify_url;
//交易类型
    private $trade_type;
//支付密钥
    private $key;
//证书路径
    private $SSLCERT_PATH;
    private $SSLKEY_PATH;
//所有参数
    private $params = array();
    public function __construct($appid, $mch_id, $notify_url, $key)
    {
        $this->appid = $appid;
        $this->mch_id = $mch_id;
        $this->notify_url = $notify_url;
        $this->key = $key;
    }
    /**
     * 下单方法
     * @param $params 下单参数
     */
    public function unifiedOrder( $params ){
        $this->body = $params['body'];
        $this->out_trade_no = $params['out_trade_no'];
        $this->total_fee = $params['total_fee'];
        $this->trade_type = $params['trade_type'];
        $this->nonce_str = $this->genRandomString();
        $this->spbill_create_ip = $_SERVER['REMOTE_ADDR'];
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->nonce_str;
        $this->params['body'] = $this->body;
        $this->params['out_trade_no'] = $this->out_trade_no;
        $this->params['total_fee'] = $this->total_fee;
        $this->params['spbill_create_ip'] = $this->spbill_create_ip;
        $this->params['notify_url'] = $this->notify_url;
        $this->params['trade_type'] = $this->trade_type;
//获取签名数据
        $this->sign = $this->MakeSign( $this->params );
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::UNIFIEDORDER_URL);
        if( !$response ){
            return false;
        }
        $result = $this->xml_to_data( $response );
        if( !empty($result['result_code']) && !empty($result['err_code']) ){
            $result['err_msg'] = $this->error_code( $result['err_code'] );
        }
        return $result;
    }

    /**
     * 小程序 下单方法
     * @param $params
     * @return bool|mixed
     */
    public function unifiedOrder2( $params ){
        $this->body = $params['body'];
        $this->out_trade_no = $params['out_trade_no'];
        $this->total_fee = $params['total_fee'];
        $this->trade_type = $params['trade_type'];
        $this->nonce_str = $this->genRandomString();
        $this->spbill_create_ip = $_SERVER['REMOTE_ADDR'];
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->nonce_str;
        $this->params['body'] = $this->body;
        $this->params['out_trade_no'] = $this->out_trade_no;
        $this->params['total_fee'] = $this->total_fee;
        $this->params['spbill_create_ip'] = $this->spbill_create_ip;
        $this->params['notify_url'] = $this->notify_url;
        $this->params['trade_type'] = $this->trade_type;
        $this->params['openid'] = $params['openid'];
//获取签名数据
        $this->sign = $this->MakeSign( $this->params );
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::UNIFIEDORDER_URL);
        if( !$response ){
            return false;
        }
        $result = $this->xml_to_data( $response );
        if( !empty($result['result_code']) && !empty($result['err_code']) ){
            $result['err_msg'] = $this->error_code( $result['err_code'] );
        }
        return $result;
    }

    /**
     * 查询订单信息
     * @param $out_trade_no 订单号
     * @return array
     */
    public function orderQuery( $out_trade_no ){
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->genRandomString();
        $this->params['out_trade_no'] = $out_trade_no;
//获取签名数据
        $this->sign = $this->MakeSign( $this->params );
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::ORDERQUERY_URL);
        if( !$response ){
            return false;
        }
        $result = $this->xml_to_data( $response );
        if( !empty($result['result_code']) && !empty($result['err_code']) ){
            $result['err_msg'] = $this->error_code( $result['err_code'] );
        }
        return $result;
    }
    /**
     * 关闭订单
     * @param $out_trade_no 订单号
     * @return array
     */
    public function closeOrder( $out_trade_no ){
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->genRandomString();
        $this->params['out_trade_no'] = $out_trade_no;
//获取签名数据
        $this->sign = $this->MakeSign( $this->params );
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::CLOSEORDER_URL);
        if( !$response ){
            return false;
        }
        $result = $this->xml_to_data( $response );
        return $result;
    }
    /**
     *
     * 获取支付结果通知数据
     * return array
     */
    public function getNotifyData(){
//获取通知的数据
        $xml = $GLOBALS['HTTP_RAW_POST_DATA'];
        //$xml = file_get_contents('php://input');
        $data = array();
        if( empty($xml) ){
            return false;
        }
        $data = $this->xml_to_data( $xml );
       if( !empty($data['return_code']) ){
           if( $data['return_code'] == 'FAIL' ){
                return false;
           }
       }
        return $data;
    }
    /**
     * 接收通知成功后应答输出XML数据
     * @param string $xml
     */
    public function replyNotify(){
      /*  ksort($data);
        $buff = '';
        foreach ($data as $k => $v){
            if($k != 'sign'){
                $buff .= $k . '=' . $v . '&';
            }
        }
        $stringSignTemp = $buff . 'key=a1M5s4s6a4r8t4g2h3Md36AlJ8s7f5sd';//key为证书密钥
        $sign = strtoupper(md5($stringSignTemp));
//判断算出的签名和通知信息的签名是否一致
        if($sign == $data['sign']){
            //处理完成之后,告诉微信成功结果
            echo '<xml>
              <return_code><![CDATA[SUCCESS]]></return_code>
              <return_msg><![CDATA[OK]]></return_msg>
          </xml>';
            exit();
        }
*/
        $data['return_code'] = 'SUCCESS';
        $data['return_msg'] = 'OK';
        $xml = $this->data_to_xml( $data );
        echo $xml;
        die();
    }
    /**
     * 生成APP端支付参数
     * @param $prepayid 预支付id
     */
    public function getAppPayParams( $prepayid ){
        $data['appid'] = $this->appid;
        $data['partnerid'] = $this->mch_id;
        $data['prepayid'] = $prepayid;
        $data['package'] = 'Sign=WXPay';
        $data['noncestr'] = $this->genRandomString();
        $data['timestamp'] = time();
        $data['sign'] = $this->MakeSign( $data );
        return $data;
    }
    /**
     * 生成签名
     * @return 签名
     */
    public function MakeSign( $params ){
//签名步骤一:按字典序排序数组参数
        ksort($params);
        $string = $this->ToUrlParams($params);
//签名步骤二:在string后加入KEY
        $string = $string . "&key=".$this->key;
//签名步骤三:MD5加密
        $string = md5($string);
//签名步骤四:所有字符转为大写
        $result = strtoupper($string);
        return $result;
    }
    /**
     * 将参数拼接为url: key=value&key=value
     * @param $params
     * @return string
     */
    public function ToUrlParams( $params ){
        $string = '';
        if( !empty($params) ){
            $array = array();
            foreach( $params as $key => $value ){
                $array[] = $key.'='.$value;
            }
            $string = implode("&",$array);
        }
        return $string;
    }
    /**
     * 输出xml字符
     * @param $params 参数名称
     * return string 返回组装的xml
     **/
    public function data_to_xml( $params ){
        if(!is_array($params)|| count($params) <= 0)
        {
            return false;
        }
        $xml = "<xml>";
        foreach ($params as $key=>$val)
        {
            if (is_numeric($val)){
                $xml.="<".$key.">".$val."</".$key.">";
            }else{
                $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
            }
        }
        $xml.="</xml>";
        return $xml;
    }
    /**
     * 将xml转为array
     * @param string $xml
     * return array
     */
    public function xml_to_data($xml){
        if(!$xml){
            return false;
        }
//将XML转为array
//禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $data;
    }
    /**
     * 获取毫秒级别的时间戳
     */
    private static function getMillisecond(){
//获取毫秒的时间戳
        $time = explode ( " ", microtime () );
        $time = $time[1] . ($time[0] * 1000);
        $time2 = explode( ".", $time );
        $time = $time2[0];
        return $time;
    }
    /**
     * 产生一个指定长度的随机字符串,并返回给用户
     * @param type $len 产生字符串的长度
     * @return string 随机字符串
     */
    private function genRandomString($len = 32) {
        $chars = array(
            "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",
            "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",
            "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G",
            "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",
            "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2",
            "3", "4", "5", "6", "7", "8", "9"
        );
        $charsLen = count($chars) - 1;
// 将数组打乱
        shuffle($chars);
        $output = "";
        for ($i = 0; $i < $len; $i++) {
            $output .= $chars[mt_rand(0, $charsLen)];
        }
        return $output;
    }
    /**
     * 以post方式提交xml到对应的接口url
     *
     * @param string $xml 需要post的xml数据
     * @param string $url url
     * @param bool $useCert 是否需要证书,默认不需要
     * @param int $second url执行超时时间,默认30s
     * @throws WxPayException
     */
    private function postXmlCurl($xml, $url, $useCert = false, $second = 30){
        $ch = curl_init();
//设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch,CURLOPT_URL, $url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);
//设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
//要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        if($useCert == true){
//设置证书
//使用证书:cert 与 key 分别属于两个.pem文件
            curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
//curl_setopt($ch,CURLOPT_SSLCERT, WxPayConfig::SSLCERT_PATH);
            curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
//curl_setopt($ch,CURLOPT_SSLKEY, WxPayConfig::SSLKEY_PATH);
        }
//post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
//运行curl
        $data = curl_exec($ch);
//返回结果
        if($data){
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            curl_close($ch);
            return false;
        }
    }
    /**
     * 错误代码
     * @param $code 服务器输出的错误代码
     * return string
     */
    public function error_code( $code ){
        $errList = array(
            'NOAUTH' => '商户未开通此接口权限',
            'NOTENOUGH' => '用户帐号余额不足',
            'ORDERNOTEXIST' => '订单号不存在',
            'ORDERPAID' => '商户订单已支付,无需重复操作',
            'ORDERCLOSED' => '当前订单已关闭,无法支付',
            'SYSTEMERROR' => '系统错误!系统超时',
            'APPID_NOT_EXIST' => '参数中缺少APPID',
            'MCHID_NOT_EXIST' => '参数中缺少MCHID',
            'APPID_MCHID_NOT_MATCH' => 'appid和mch_id不匹配',
            'LACK_PARAMS' => '缺少必要的请求参数',
            'OUT_TRADE_NO_USED' => '同一笔交易不能多次提交',
            'SIGNERROR' => '参数签名结果不正确',
            'XML_FORMAT_ERROR' => 'XML格式错误',
            'REQUIRE_POST_METHOD' => '未使用post传递参数 ',
            'POST_DATA_EMPTY' => 'post数据不能为空',
            'NOT_UTF8' => '未使用指定编码格式',
        );
        if( array_key_exists( $code , $errList ) ){
            return $errList[$code];
        }
    }
}

统一下单

        include_once "payapi.php";
        $params['body'] = $bodys; //商品描述
        $params['out_trade_no'] = $order; //自定义的订单号
        $params['total_fee'] = $allmoney*100; //订单金额 只能为整数 单位为分
        $params['trade_type'] = 'JSAPI'; //交易类型 JSAPI | NATIVE | APP | WAP
        $params['openid'] = ‘22222222’;//微信用户的openid
        $PAYAPPID = $pay->appid;
        $PAYKEY = 'xxxx';//商户密钥
        $PAYMCHID = 'xxxxx';//商户id
        $NOTIFY_URL = 'http://xxxxx';//这里只需填写你网址即可

        $wechatAppPay = new wechatAppPay($PAYAPPID, $PAYMCHID, $NOTIFY_URL, $PAYKEY);

        $result = $wechatAppPay->unifiedOrder2( $params );
        if ($result['result_code']=='SUCCESS'&&$result['return_code']=='SUCCESS') {
        //下单成功,记录在库处理逻辑
        //..............
        //....................
        //返回订单号,后面小程序拿来查询订单的状态的
        result['out_trade_no'] = $order;
        return $this->enJson(200, '下单成功', $result);
}

小程序支付成功后调用查询订单接口,修改订单状态:


//查询订单状态
$PAYAPPID = $appid;
$PAYKEY = $paykey;
$PAYMCHID = $mch_id;
$NOTIFY_URL = 'https://www.xxxxx';
    $out_trade_no=$_POST['out_trade_no'];//自定义的订单号
    $openid =$_POST['openid'];

    $wechatAppPay = new wechatAppPay($PAYAPPID, $PAYMCHID, $NOTIFY_URL, $PAYKEY);
    $res=$wechatAppPay->orderQuery($out_trade_no);
    if ($res['return_code']=='SUCCESS'&&$res['result_code']=='SUCCESS'&&$res['trade_state']=='SUCCESS'){
    //支付成功,修改订单状态

}



##### 基本的流程差不多就是这个样子了,如果哪里不对或不明确欢迎留言
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