Global Time Slots Booking for the Durations Based Time

functions.php

<?php

/**
 * Global Time Slots Booking for the Durations Based Time.
 */
function bkap_additional_bookings_to_be_considered( $booking_idss, $product_id, $resource_id ) {

	// Getting Product ids that has Duration Based Time Booking Type.
	$args           = array(
		'post_type'      => 'product',
		'meta_query'     => array(
			array(
				'key'     => '_bkap_booking_type',
				'value'   => 'duration_time',
				'compare' => '=',
			),
		),
	);
	$duration_query = new WP_Query( $args );

	$product_ids = array();
	if ( $duration_query->have_posts() ) {
		foreach ( $duration_query->posts as $post1 ) {
			$product_ids[] = $post1->ID;
		}

		if ( ( $key = array_search( $product_id, $product_ids ) ) !== false ) {
			unset( $product_ids[ $key ] );
		}
	}

	if ( $resource_id > 0 ) {
		$meta_key   = '_bkap_resource_id';
		$meta_value = $resource_id;
	} else {
		$meta_key   = '_bkap_product_id';
		$meta_value = $product_id;
	}

	if ( count( $product_ids ) > 0 ) {
		// IF there are other products that are setup with the Duration Based Time Booking Type
		// Then fetch the bookings of those products and consider those bookings for current product.
		$args = array(
			'post_type'      => 'bkap_booking',
			'post_status'    => array( 'paid', 'pending-confirmation', 'confirmed' ),
			'posts_per_page' => -1,
			'meta_query'     => array(
				array(
					'key'     => $meta_key,
					'value'   => $product_ids,
					'compare' => 'IN',
				),
			),
		);

		$query1 = new WP_Query( $args );

		if ( $query1->have_posts() ) {
			foreach ( $query1->posts as $post1 ) {
				$booking_idss[] = $post1->ID;
			}
		}
	}

	return $booking_idss;
}
add_filter( 'bkap_additional_bookings_to_be_considered', 'bkap_additional_bookings_to_be_considered', 10, 3 );