ET > Template override to allow the sorting of RSVP blocks on the front-end based on selected properties

rsvp.php

<?php
/**
 * A template override to allow the sorting of RSVP blocks on the front-end based on selected properties.
 *
 * Block: RSVP
 *
 * This is a template override for the following file:
 * event-tickets/src/views/v2/rsvp.php
 *
 * This file should be placed in the following folder:
 * [your-theme]/tribe/tickets/v2/rsvp.php
 *
 * See more documentation about our Blocks Editor templating system.
 *
 * @link  https://evnt.is/1amp Help article for RSVP & Ticket template files.
 *
 * @since 4.12.3
 *
 * @version 5.0.0
 *
 * @var Tribe__Tickets__Editor__Template $this
 * @var WP_Post|int                      $post_id       The post object or ID.
 * @var boolean                          $has_rsvps     True if there are RSVPs.
 * @var array                            $active_rsvps  An array containing the active RSVPs.
 * @var string                           $block_html_id The unique HTML id for the block.
 *
 * Plugins required: Event Tickets
 * Author: Andras Guseo
 * Created: November 23, 2023
 */

// We don't display anything if there is no RSVP.
if ( ! $has_rsvps ) {
	return false;
}

// Bail if there are no active RSVP.
if ( empty( $active_rsvps ) ) {
	return;
}

/**
 * START: RSVP Sorting
 * 
 * Specify the properties you want to sort by and the orders of sorting.
 * Recommended properties:
 * - ID         - The post ID of the RSVP/ticket
 * - name       - The name/title of the RSVP/ticket,
 * - stock      - The current available stock of the RSVP/ticket
 * - capacity   - The full capacity of the RSVP/ticket
 * - start_date - The sale start date of the RSVP/ticket
 * - start_time - The sale start time of the RSVP/ticket
 * - end_date   - The sale end date of the RSVP/ticket
 * - end_time   - The sale end time of the RSVP/ticket
 * - sku        - The SKU name of the RSVP/ticket
 * Sorting orders: ASC or DESC
 *
 * If you only want to sort by one property, use $property2 = null
*/
$property1 = 'stock';
$order1    = 'ASC';
$property2 = null;
$order2    = 'ASC';

// Use usort to sort the array by the specified properties and orders
usort( $active_rsvps, function ( $a, $b ) use ( $property1, $order1, $property2, $order2 ) {
	return compareByProperties( $a, $b, $property1, $order1, $property2, $order2 );
} );

/**
 * A custom comparison function for sorting the RSVPs.
 *
 * @param mixed $a          A property of the RSVP to compare.
 * @param mixed $b          A property of the RSVP to compare.
 * @param string $property1 The primary property to arrange RSVPs by.
 * @param string $order1    The sorting order for the primary property.
 * @param string $property2 The secondary property to arrange RSVPs by.
 * @param string $order2    The sorting order for the secondary property.
 *
 * @return int
 */
function compareByProperties( $a, $b, $property1, $order1, $property2 = null, $order2 = 'ASC' ) {
	// Compare objects based on the specified properties and orders
	$result1 = ( $order1 == 'ASC' ) ? ( $a->$property1 <=> $b->$property1 ) : ( $b->$property1 <=> $a->$property1 );

	if ( $property2 != null && $result1 == 0 ) {
		// If the first specified property is the same, compare by the second property and order
		$result2 = ( $order2 == 'ASC' ) ? strcmp( $a->$property2, $b->$property2 ) : strcmp( $b->$property2, $a->$property2 );

		return $result2;
	}

	return $result1;
}
// END: RSVP Sorting
?>

<div
	id="<?php echo esc_attr( $block_html_id ); ?>"
	class="tribe-common event-tickets"
>
	<?php foreach ( $active_rsvps as $rsvp ) : ?>
		<div
			class="tribe-tickets__rsvp-wrapper"
			data-rsvp-id="<?php echo esc_attr( $rsvp->ID ); ?>"
		>
			<?php $this->template( 'v2/components/loader/loader' ); ?>
			<?php $this->template( 'v2/rsvp/content', [ 'rsvp' => $rsvp ] ); ?>

		</div>
	<?php endforeach; ?>
</div>