Adding {organizers_with_links} tags

add-organizers-with-links.php

<?php
/*
 * Plugin Name: Event Calendar Newsletter - Add Organizer with Links Tag
 * Plugin URI: https://eventcalendarnewsletter.com
 * Description: Add {organizers_with_links} tag for Event Prime
 * Version: 1.0.0
 * Author: Event Calendar Newsletter
 * Author URI: https://eventcalendarnewsletter.com
 * Text Domain: event-calendar-newsletter
 * License: GPL2
*/

// Add the additional data for each event
function ecn_add_organizers_with_url_data( $args, $post ) {
    // Use additional_data to store our extra data
    if ( ! isset( $args['additional_data'] ) )
        $args['additional_data'] = array();

    $organizers = get_the_terms( $post->id, 'em_event_organizer' );
    $organizers_with_urls = array();
    foreach ( $organizers as $organizer ) {
        if ( is_array( get_term_meta( $organizer->term_id, 'em_organizer_websites', true ) ) ) {
            $organizers_with_urls[] = '<a href="' . esc_url( get_term_meta( $organizer->term_id, 'em_organizer_websites', true )[0] ) . '">' . esc_html( $organizer->name ) . '</a>';
        } else {
            $organizers_with_urls[] = esc_html( $organizer->name );
        }    
    }

    $args['additional_data']['organizers_with_links'] = implode( ', ', $organizers_with_urls );
    return $args;
}
add_filter(
    'ecn_create_calendar_event_args-event-prime',
    'ecn_add_organizers_with_url_data',
    10,
    2
);

// Register the template tag and description
function ecn_add_organizers_with_url( $fields, $plugin ) {
    if ( 'event-prime' != $plugin )
        return $fields;
    $fields['organizers_with_links'] = 'Organizers With Links';
    return $fields;
}
add_filter( 'ecn_available_format_tags_display', 'ecn_add_organizers_with_url', 10, 2 );