微信支付邏輯

<?php
namespace app\api\controller;
use think\Controller;
use think\Db;
class WxPayController extends Controller{
    /*
    配置引數
    */
    private $config = array(
        'appid' => "",    /*微信開放平臺上的應用id*/
        'mch_id' => "",   /*微信申請成功之後郵件中的商戶id*/
        'api_key' => ""    /*在微信商戶平臺上自己設定的api金鑰 32位
 
*/
    );


    //獲取預支付訂單
    public function getPrePayOrder($body, $out_trade_no, $total_fee, $notify_url){
        $url = "https://api.mch.weixin.qq.com/pay/unifiedorder";

        $onoce_str = $this->getRandChar(32);

        $data["appid"] = $this->config["appid"];
        $data["body"] = $body;
        
 
$data["mch_id"] = $this->config['mch_id'];
        $data["nonce_str"] = $onoce_str;
        $data["notify_url"] = $notify_url;
        $data["out_trade_no"] = $out_trade_no;
        $data["spbill_create_ip"] = $this->get_client_ip();
        $data["total_fee"] = $total_fee;
        $data["trade_type"] = "APP";
        
 
$s = $this->getSign($data, false);
        $data["sign"] = $s;

        $xml = $this->arrayToXml($data);
        $response = $this->postXmlCurl($xml, $url);

        //將微信返回的結果xml轉成陣列
       return $this->xmlstr_to_array($response);
        // return xmlToArray($response);
         return $response;
    }

    //執行第二次簽名，才能返回給客戶端使用
    public function getOrder($prepayId){
        $data["appid"] = $this->config["appid"];
        $data["noncestr"] = $this->getRandChar(32);;
        $data["package"] = "Sign=WXPay";
        $data["partnerid"] = $this->config['mch_id'];
        $data["prepayid"] = $prepayId;
        $data["timestamp"] = time();
        $s = $this->getSign($data, false);
        $data["sign"] = $s;

        return $data;
    }

    /*
        生成簽名
    */
    function getSign($Obj)
    {
        foreach ($Obj as $k => $v)
        {
            $Parameters[strtolower($k)] = $v;
        }
        //簽名步驟一：按字典序排序引數
        ksort($Parameters);
        $String = $this->formatBizQueryParaMap($Parameters, false);
        //echo "【string】 =".$String."";
        //簽名步驟二：在string後加入KEY
        $String = $String."&key=".$this->config['api_key'];
        //簽名步驟三：MD5加密
        $result_ = strtoupper(md5($String));
        return $result_;
    }

    //獲取指定長度的隨機字串
    function getRandChar($length){
        $str = null;
        $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
        $max = strlen($strPol)-1;

        for($i=0;$i<$length;$i++){
            $str.=$strPol[rand(0,$max)];//rand($min,$max)生成介於min和max兩個數之間的一個隨機整數
        }

        return $str;
    }

    //陣列轉xml
    function arrayToXml($arr)
    {
        if(!is_array($arr)|| count($arr) <= 0)
            {
                return false;
            }
            $xml = "<xml>";
            foreach ($arr as $key=>$val)
            {
                if (is_numeric($val)){
                    $xml.="<".$key.">".$val."</".$key.">";
                }else{
                    $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
                }
            }
            $xml.="</xml>";
            return $xml; 
    }

    //post https請求，CURLOPT_POSTFIELDS xml格式
    function postXmlCurl($xml,$url,$second=30)
    {
        //初始化curl
        $ch = curl_init();
        //超時時間
        curl_setopt($ch,CURLOPT_TIMEOUT,$second);
        //這裡設定代理，如果有的話
        //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
        //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
        curl_setopt($ch,CURLOPT_URL, $url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
        //設定header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求結果為字串且輸出到螢幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        //執行curl
        $data = curl_exec($ch);
        //返回結果
        if($data)
        {
            curl_close($ch);
            return $data;
        }
        else
        {
            $error = curl_errno($ch);
            echo "curl出錯，錯誤碼:$error"."";
            echo "錯誤原因查詢";
            curl_close($ch);
            return false;
        }
    }

    /*
        獲取當前伺服器的IP
    */
    function get_client_ip()
    {
        if ($_SERVER['REMOTE_ADDR']) {
            $cip = $_SERVER['REMOTE_ADDR'];
        } elseif (getenv("REMOTE_ADDR")) {
            $cip = getenv("REMOTE_ADDR");
        } elseif (getenv("HTTP_CLIENT_IP")) {
            $cip = getenv("HTTP_CLIENT_IP");
        } else {
            $cip = "unknown";
        }
        return $cip;
    }

    //將陣列轉成uri字串
    function formatBizQueryParaMap($paraMap, $urlencode)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v)
        {
            if($urlencode)
            {
                $v = urlencode($v);
            }
            $buff .= strtolower($k) . "=" . $v . "&";
        }
        $reqPar;
        if (strlen($buff) > 0)
        {
            $reqPar = substr($buff, 0, strlen($buff)-1);
        }
        return $reqPar;
    }

    /*
      //xml轉成陣列
     */
    function xmlstr_to_array($xmlstr) {
         //將XML轉為array
         $array_data = json_decode(json_encode(simplexml_load_string($xmlstr, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
         return $array_data;
    }

    function domnode_to_array($node) {
        $output = array();
        switch ($node->nodeType) {
            case XML_CDATA_SECTION_NODE:
            case XML_TEXT_NODE:
                $output = trim($node->textContent);
                break;
            case XML_ELEMENT_NODE:
                for ($i=0, $m=$node->childNodes->length; $i<$m; $i++) { $child = $node->childNodes->item($i);
                    $v = $this->domnode_to_array($child);
                    if(isset($child->tagName)) {
                        $t = $child->tagName;
                        if(!isset($output[$t])) {
                            $output[$t] = array();
                        }
                        $output[$t][] = $v;
                    }
                    elseif($v) {
                        $output = (string) $v;
                    }
                }
                if(is_array($output)) {
                    if($node->attributes->length) {
                        $a = array();
                        foreach($node->attributes as $attrName => $attrNode) {
                            $a[$attrName] = (string) $attrNode->value;
                        }
                        $output['@attributes'] = $a;
                    }
                    foreach ($output as $t => $v) {
                        if(is_array($v) && count($v)==1 && $t!='@attributes') {
                            $output[$t] = $v[0];
                        }
                    }
                }
                break;
        }
        return $output;
    }
}

呼叫方法

<?php
namespace app\api\controller;    
use think\Request;
use think\Db;
// use think\Controller;
use app\common\model\Order;

class PayController extends Controller
{
    public function pay_order()
    {
        $reoderSn = input('post.order_sn');
        $pay_type = input('post.pay_type');
        //判斷支付方式
        switch ($pay_type) {
            case 'ali';
            //如果支付方式為支付寶支付
                break;
            case 'wx';
                $type['pay_type'] = 'wx';//更新支付方式為微信
      
                $wx = new WxPayController();//例項化微信支付控制器
                
                $out_trade_no = $reoderSn;//訂單號
                
                $list = Order::selOrderinfo($reoderSn);//查詢訂單金額，也可直接介面傳
                
                $body = $list['order_details'];//支付說明
                
                $total_fee = $list['totle_sum'] * 100;//支付金額(乘以100)
                
                $notify_url = '';//回撥地址

                $order = $wx->getPrePayOrder($body, $out_trade_no, $total_fee, $notify_url);//呼叫微信支付的方法
                

                if ($order['prepay_id']){//判斷返回引數中是否有prepay_id
                    
                    $ordertwo = $wx->getOrder($order['prepay_id']);//執行二次簽名返回引數
                    
                    
                    
                    return success($ordertwo ,'成功');
                } else {
                    return error('失敗');
                }
                break;
        }


    }
}                    

回撥方法需要的可聯絡