是否可以在实时更换服务器上的PHP文件？

Question

If I want to update a PHP file on the server using FTP, can I replace it while the website is live and it may be executed any time?

Could there be a 404 error (or any other error) if a user tries to execute the php file at the exact moment it is being replaced? Or will there be some kind of file 'lock' while it is being overwritten?

Should I put the server in 'maintenance mode' first?

Answer 1

There will be some or other issues if some user is accessing that file while you updating it via FTP. It is always a good practice to put your site on maintenance mode and then update the files.