I'm looking to use the function for Disallowing duplicate entries in a specific form for one year.
https://formidableforms.com/knowledgebase/frm_time_to_check_duplicates/#kb-disallow-duplicate-entries-in-a-specific-form-for-one-year

add_filter('frm_time_to_check_duplicates', 'change_duplicate_time_limit_one_form', 10, 2); function change_duplicate_time_limit_one_form( $time_limit, $entry_values ) { if ( $entry_values['form_id'] == 100 ) { //change 100 to your form ID $time_limit = 31536000; } return $time_limit; }

However I'd like to modify this to only check against entries that have matching value for the date field AND user ID in each.

Is this possible?