Sets the Event Espresso 4 ticket selector to display only one time if it's a single post. This is useful for custom placement of the ticket selector with a short code.

ee_display_ticket_selector_once.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file
add_filter( 'FHEE_disable_espresso_ticket_selector', 'ee_display_ticket_selector_once' );
function ee_display_ticket_selector_once() {
    if( ! defined( 'TS_EXECUTED' ) ){
        add_filter( 'FHEE_disable_espresso_ticket_selector', '__return_false' );
        if ( is_single() ){
            define( 'TS_EXECUTED', TRUE );
        }
    } else {
        add_filter( 'FHEE_disable_espresso_ticket_selector', '__return_true' );
    }
}