drb/app/Service/OrderNoService.php

<?php

namespace App\Service;

use App\Model\Construction;
use App\Model\SalesOrder;

class OrderNoService extends Service
{
    //采购 收货 发货 单号生成
    public function createOrderNumber($prefix){
        return $prefix . date('YmdHis') . time() . rand(1000,9999);
    }

    //合同编号
    public static function createSalesOrderNumber($prefix){
        return $prefix . date('YmdHis',time()). rand(1000,9999);
    }

    //施工单订单合同号
    public static function createConstructionOrderNumber($prefix){
       return $prefix . date('YmdHis',time()). rand(1000,9999);
    }

    //采购 收货 发货 单号生成
    public function createReturnExchangeOrderNumber($prefix){
        return $prefix . date('YmdHis') . time() . rand(1000,9999);
    }


    //暂时不用--------------------------------------------------------------------------
    //合同编号
    public static function createSalesOrderNumber1($prefix){
        $str = $prefix . date('Ymd',time());

        $order_number = SalesOrder::where('order_number','Like','%'. $str . '%')
            ->max('order_number');

        if(empty($order_number)){
            $number = str_pad(1,3,'0',STR_PAD_LEFT);
            $number = $str . $number;
        }else{
            $tmp = substr($order_number, -3);
            $tmp = $tmp + 1;

            //超过999
            if(strlen($tmp) > 3) return '';

            $number = str_pad($tmp,3,'0',STR_PAD_LEFT);
            $number = $str . $number;
        }

        return $number;
    }

    //施工单订单合同号
    public static function createConstructionOrderNumber1($prefix){
        $str = $prefix . date('Ymd',time());

        $order_number = Construction::where('order_number','Like','%'. $str . '%')
            ->max('order_number');

        if(empty($order_number)){
            $number = str_pad(1,3,'0',STR_PAD_LEFT);
            $number = $str . $number;
        }else{
            $tmp = substr($order_number, -3);
            $tmp = $tmp + 1;

            //超过999
            if(strlen($tmp) > 3) return '';

            $number = str_pad($tmp,3,'0',STR_PAD_LEFT);
            $number = $str . $number;
        }

        return $number;
    }

    static function generateOrderNumber() {
        // 获取当前日期
        $date = date('Ymd', time());

        // 从数据库中获取已存在的最大单据号
        $maxOrderNumber = SalesOrder::max('order_number');

        // 定义单据号位数
        $digitCount = 6;

        // 如果数据库中没有单据号，则从000001开始
        if(empty($maxOrderNumber)){
            $number = $date . str_pad(1, $digitCount, '0', STR_PAD_LEFT);
        }else{
            // 获取数字部分
            $lastNumber = substr($maxOrderNumber, -1 * $digitCount);
            $lastNumber = (int)$lastNumber;

            // 数字自增
            $number = $lastNumber + 1;
            $number = str_pad($number, $digitCount, '0', STR_PAD_LEFT);

            // 拼接单据号
            $number = $date . $number;
        }

        return $number;
    }
}