What changes need to be made in the PHP configuration files to ensure successful file uploads?

To ensure successful file uploads in PHP, you need to adjust the configuration settings related to file uploads in the php.ini file. Specifically, you may need to increase the values for `upload_max_filesize`, `post_max_size`, and `max_file_uploads` to accommodate larger file uploads. Additionally, you should ensure that the `file_uploads` directive is set to `On` to allow file uploads.

; Maximum allowed size for uploaded files
upload_max_filesize = 20M

; Maximum size of POST data that PHP will accept
post_max_size = 25M

; Maximum number of files that can be uploaded in a single request
max_file_uploads = 5

; Enable file uploads
file_uploads = On