使用Symfony Process运行后台任务，而无需等待进程完成

After a user submits a form, I want to render a view file, and right after that I want to initiate a background task to process five MS Excel files (each may have up to 2000 rows) , but in way so that the user don't have to wait for the process to finish in order to view the page. After the task is finished I will inform the user through an email.After a user submits a form, I want to render a