php 小程序支付全過程

1、開發前準備

     登錄小程序管理後臺，設置服務器域名(request請求地址)，業務域名，綁定公衆號主體，獲取公衆商戶ID，支付密鑰，小程序APPID，小程序APP_SECRET

 

2、預支付接口調取

 

    try{
            $order_no = create_order_no('C');
            $data = [
                'appid'=>Config::get('wechat_config.appid'),
                'body'=>'會員充值',
                'mch_id'=>'1535585301',
                'nonce_str'=>getNonceStr(),
                'notify_url'=>'回調地址',
                'out_trade_no'=>$order_no,
                'openid'=>$this->user['openid'],
                'spbill_create_ip'=>$_SERVER['REMOTE_ADDR'],
                'total_fee'=>$this->params['money']*100,
                'trade_type'=>'JSAPI'
            ];
            $sign = sign($data);
            $data['sign'] = $sign;
            $xmldata = xml($data);
            $res = CURL(Config::get('wechat_api.wx_pay'),$xmldata);
            $result = getxml($res);

            if($result['RETURN_CODE'] == "SUCCESS"){
                //插入數據庫
                
                $info = [
                    'appId'=>Config::get('wechat_config.appid'),
                    'timeStamp'=>time(),
                    'nonceStr'=>getNonceStr(),
                    'package'=>'prepay_id='.$result['PREPAY_ID'],
                    'signType'=>'MD5'
                ];
                $info['paySign'] = sign($info);
                return [
                    'status'=>1,
                    'msg'=>'成功！',
                    'info'=>$info

                ];
            }else{
                return [
                    'status'=>0,
                    'msg'=>'操作失敗！'
                ];
            }
        }catch(Exception $e){
            return [
                'status'=>0,
                'msg'=>'系統錯誤，請稍後！'
            ];
        }

2、自定義參數

function create_order_no($type = 'D'){
    $random = rand(10000,99999);
    return $type.date('YmdHis').$random;
}


//隨機32位字符串
function getNonceStr($length = 32)
{
    $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
    $str ="";
    for ( $i = 0; $i < $length; $i++ )  {
        $str .= substr($chars, mt_rand(0, strlen($chars)-1), 1);
    }
    return $str;
}

function sign($data){
    $key = '支付密鑰';
    ksort($data);
    $buff = '';
    foreach($data as $k=>$v){
        if($k!='sign'&&$v!=''&&!is_array($v)){
            $buff .= $k.'='.$v.'&';
        }
    }
    $buff = trim($buff,'&');
    $string = $buff.'&key='.$key;
    $string = md5($string);
    $sign = strtoupper($string);
    return $sign;
}

function xml($data){
    ksort($data);
    $data_xml = '<xml>';
    foreach($data as $key=>$val){
        if(is_numeric($val)){
            $data_xml .= '<'.$key.'>'.$val.'</'.$key.'>';
        }else{
            $data_xml .= '<'.$key.'><![CDATA['.$val.']]></'.$key.'>';
        }
    }
    $data_xml .= '</xml>';
    return $data_xml;
}

function getxml($xml){
    $p = xml_parser_create();
    xml_parse_into_struct($p,$xml,$vals,$index);
    xml_parser_free($p);
    $data = '';
    foreach($index as $key=>$value){
        if($key == 'xml' || $key =='XML' ) continue;
        $tag = $vals[$value[0]]['tag'];
        $value = $vals[$value[0]]['value'];
        $data[$tag] = $value;
    }
    return $data;
}

3、支付回調

 

        $xml = file_get_contents("php://input");
        //$data = getxml($xml);
        $jsonxml = json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA));

        $data = json_decode($jsonxml, true);//轉成數組，
        $data_sign = $data['sign'];
        unset($data['sign']);
        $sign = sign($data);
        if($sign === $data_sign && ($data['return_code']=='SUCCESS') && ($data['result_code']=='SUCCESS') ){
            //通過金額與訂單號去數據庫查詢是否存在訂單
            
            if(!$ret){
                echo '<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[訂單信息不正確]]></return_msg></xml>';
                exit();
            }else{
                try{
                    //更新訂單及用戶餘額積分
                    
                    if($ret1 && $ret2){

                        Db::commit();
                        echo '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
                        exit();
                    }else{
                        Db::rollback();
                        $log_model->save(
                            [
                                'title'=>'回調失敗1',
                                'content'=>'回調失敗1'
                            ]
                        );
                        echo '<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[操作失敗]]></return_msg></xml>';
                        exit();
                    }
                }catch(Exception $e){
                    echo '<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[操作失敗]]></return_msg></xml>';
                    exit();
                }
            }
        }