This wp-config.php function controls the number of days before WordPress permanently deletes posts, pages, attachments & comments from the trash bin.
This function will automate process of deleting WordPress Trash & you will not have to press ‘Empty Trash’ button again for your installation.
Default WordPress Trash Settings
The default is 30 days.
define( 'EMPTY_TRASH_DAYS', 30 ); // 30 days default
Disable WordPress Trash & Delete things immediately
To disable trash set the number of days to zero.
Note: WordPress will not ask with confirmation prompt when someone clicks on “Delete Permanently” WordPress User Interface (UI) button.
define( 'EMPTY_TRASH_DAYS', 0 ); // Disable Trash & Delete Immediately Without Prompt (Zero days)
Recommendations & Suggestions
I would suggest defining days to 10. You will have enough time to undelete & restore important item from WordPress trash & You don’t have to press empty trash button again everywhere in posts, comments & pages. It will be peace of mind & security that your WordPress Installation is Optimised & not bloated with useless data.
/* Automatically delete WordPress trash after 10 days */ define( 'EMPTY_TRASH_DAYS', 10 );
Hope this information helps,
Thanks & Regards