How can PHP settings like upload_max_filesize and upload_tmp_dir impact file uploads and what are the recommended values?

When uploading files in PHP, settings like upload_max_filesize and upload_tmp_dir can impact the success of the file upload process. upload_max_filesize determines the maximum size of files that can be uploaded, while upload_tmp_dir specifies the temporary directory where uploaded files are stored before processing. It is important to set these values appropriately to ensure that file uploads are successful and secure. Recommended values for upload_max_filesize can vary depending on the application's needs, but a common value is 32MB. For upload_tmp_dir, it is recommended to use a secure directory that is not accessible to the public.

// Set maximum file upload size to 32MB
ini_set('upload_max_filesize', '32M');

// Set temporary upload directory to a secure location
ini_set('upload_tmp_dir', '/path/to/secure/directory');