Laravel 5:错误:“；未找到驱动程序”；同时在laravel中迁移数据库(mysql）

自从我尝试在laravel 5中使用数据库以来，已经有大约5-6个小时了。

我看过很多视频，它让我很困惑。

我已经创建了模型和迁移，但当我尝试迁移时，它会给我一个

[PDOException]未找到驱动程序

我对.env和database.php做了很多更改，但都不起作用。

我正在使用带有xampp服务器的laravel 5。

请帮助

谢谢

.env文件

APP_ENV=local
APP_DEBUG=true
APP_KEY=zZfvju3BKjxmLKbl5gsVJ3ymkIvHbGNq
DB_CONNECTION=mysql
DB_HOST=localhost
DB_PORT=3306
DB_DATABASE=medicaldb
DB_USERNAME=root
DB_PASSWORD=
CACHE_DRIVER=file
SESSION_DRIVER=file
QUEUE_DRIVER=sync
MAIL_DRIVER=smtp
MAIL_HOST=mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=null
MAIL_PASSWORD=null
MAIL_ENCRYPTION=null

database.php文件

<?php
return [
    'fetch' => PDO::FETCH_CLASS,
    'default' => env('DB_CONNECTION', 'mysql'),
    'connections' => [
        'sqlite' => [
            'driver' => 'sqlite',
            'database' => env('DB_DATABASE', database_path('database.sqlite')),
            'prefix' => '',
        ],
        'mysql' => [
            'driver' => 'mysql',
            'host' => env('DB_HOST', 'localhost'),
            'port' => env('DB_PORT', '3306'),
            'database' => env('DB_DATABASE', 'medicaldb'),
            'username' => env('DB_USERNAME', 'root'),
            'password' => env('DB_PASSWORD', ''),
            'charset' => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'prefix' => '',
            'strict' => false,
            'engine' => null,
        ],
        'pgsql' => [
            'driver' => 'pgsql',
            'host' => env('DB_HOST', 'localhost'),
            'port' => env('DB_PORT', '5432'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'charset' => 'utf8',
            'prefix' => '',
            'schema' => 'public',
        ],
    ],

    'migrations' => 'migrations',
    'redis' => [
        'cluster' => false,
        'default' => [
            'host' => env('REDIS_HOST', 'localhost'),
            'password' => env('REDIS_PASSWORD', null),
            'port' => env('REDIS_PORT', 6379),
            'database' => 0,
        ],
    ],
];