GravityView Calendar - Modify the settings for a single event

gravityview-calendar-modify-events.php

<?php

/**
 * Modify event array that is output to FullCalendar
 * In this sample code, we add a background color to a specific event
 *
 * @param array  $events    Array of events.
 * @param object $form      Calendar form.
 * @param object $feed      Calendar feed.
 * @param array  $field_map Array of feed fields mapped to calendar settings (e.g., start_time, end_time).
 * @param array  $entries   Array of entries being displayed in the calendar (Requires 1.5.2)
 *
 * @return array $events Modified events
 */
add_filter( 'gravityview/calendar/events', function ( $events, $form, $feed, $field_map = array(), $entries = array() ) {
	if ( empty( $events ) || empty( $entries ) ) {
		return;
	}
	$event_ids = wp_list_pluck( $events, 'event_id' );
	foreach ( $entries as $entry ) {
		$event_key = array_search( $entry->ID, $event_ids );
		if ( false === $event_key ) {
			continue;
		}
		// Modify event color if field ID #1 value is "some value"
		if ( 'some value' === $entry[1] ) {
			$events[ $event_key ]['backgroundColor'] = 'red';
			$events[ $event_key ]['borderColor']     = 'blue';
			$events[ $event_key ]['textColor']       = 'yellow';
		}
	}
	
	return $events;
}, 10, 5 );