source.php

См. документацию.

<?php
define('STOP_STATISTICS', true);
define('PUBLIC_AJAX_MODE', true);
define('NOT_CHECK_PERMISSIONS', true);
 
use Bitrix\Main\Loader,
    Bitrix\Landing;
 
if (isset($_REQUEST['site']) && is_string($_REQUEST['site']))
{
    if (preg_match('/^[a-z0-9_]{2}$/i', $_REQUEST['site']))
    {
        define('SITE_ID', $_REQUEST['site']);
    }
}
if (isset($_REQUEST['template']) && is_string($_REQUEST['template']))
{
    $template = preg_replace(
        "/[^a-zA-Z0-9_.]/",
        "",
        $_REQUEST['template']
    );
    if ($template !== '')
    {
        define('SITE_TEMPLATE_ID', $template);
    }
}
if (isset($_REQUEST['admin_section']) && $_REQUEST['admin_section'] === 'Y')
{
    define('ADMIN_SECTION', true);
}
 
require_once($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/include/prolog_before.php');
 
if (Loader::includeModule('landing'))
{
    $selector = new Landing\Source\Selector();
    $selector->showSourceFilterByRequest();
}
 
require($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/include/epilog_after.php');