思路

迁移也是运行数据库DDL语句，那么只要在Laravel迁移的语句后面添加自定义DDL语句设置自动递增初始值就好了。

引用DB

use Illuminate\Support\Facades\DB;

MySQL

以修改users表为例，设置自动递增初始值为例1000

DB::statement('ALTER TABLE users AUTO_INCREMENT=1000');

PostgreSQL

修改users表的序列，设置自动递增初始值为例1000。

DB::statement('alter sequence users_id_seq restart with 1000');

其他

如果在配置里面设置了表前缀，需要手动添加表前缀。

参考

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;

class CreateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('name');
            $table->string('email')->unique();
            $table->timestamp('email_verified_at')->nullable();
            $table->string('password');
            $table->rememberToken();
            $table->timestamps();
        });

        $prefix = DB::getConfig('prefix');
        $driver = DB::getConfig('driver');
        if ('mysql' == $driver) {
            DB::statement("ALTER TABLE {$prefix}users AUTO_INCREMENT=1000");
        }
        if ('pgsql' == $driver) {
            DB::statement("alter sequence {$prefix}users_id_seq restart with 1000");
        }
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('users');
    }
}