Add new placeholders to Event Rocket plugin

functions.php

<?php
/*may need additional placeholders for the event rocket plugin, which in turn extends The Events Calendar */

add_filter( 'eventrocket_embedded_event_placeholders', 'my_new_inline_template_tag' );

function my_new_inline_template_tag( $placeholders ) {
    $placeholders['{random_number}'] = 'my_inline_template_tag_hander';
    return $placeholders;
}

function my_inline_template_tag_handler() {
    return rand( 0, 1000000 );
}
?>