Snippet to get additional number of people from total persons.

functions.php

/**
 * Snippet to get additional number of people from total persons.
 * Created at : 7 Jan 2019
 * PluginHive Plugins : https://www.pluginhive.com/plugins/
 */
add_filter( 'phive_booking_total_person_details', 'phive_booking_get_additional_person_details', 10,2 );
function phive_booking_get_additional_person_details($total_person_detail,$product_id)
{
	$minimum_person_details = array(
				           '323'    =>    array(                            // Product Id
								               array(
								                   'minimum_person'            =>    2      // minimum participant for type 1  
								               ),
								               array(
								                   'minimum_person'            =>    3
								               ),
				           ),
				           '1190'    =>    array(                            // Product Id
								               array(
								                   'minimum_person'            =>    1
								               ),
								               array(
								                   'minimum_person'            =>    2
								               ),
				           ),
       );

   if( empty($minimum_person_details[$product_id]) )    
   		return $total_person_detail;
   foreach( $total_person_detail as $key => &$number_of_persons ) {
       if( ! empty($minimum_person_details[$product_id][$key]) ) {
           $number_of_persons-=$minimum_person_details[$product_id][$key]['minimum_person'];
       }
   }
   return $total_person_detail;
}