PHP中的PDOException不是本地服务器

I am working on nginx server which is not in my local machine. I have mysql workbench where i store database. I have a database in my mysql workbench. In laravel when i run the command php artisan migrate to connect with the database, i get the following error:

[Illuminate\Database\QueryException]
could not find driver (SQL: select * from information_schema.tables where table_schema = database_name and table_name = migrations)
  [PDOException]
  could not find driver

My .env file is like the following:

APP_ENV=local 

APP_KEY=applicaion_key

APP_DEBUG=true

APP_LOG_LEVEL=debug

APP_URL=host address of mysql server

DB_CONNECTION=mysql

DB_HOST=ip address of the host of mysql workbench

DB_PORT=3306 // 

DB_DATABASE=database_name

DB_USERNAME=username

DB_PASSWORD=mysql workbench password