location.php

См. документацию.

<?php
 
namespace Bitrix\Landing\Assets;
 
class Location
{
    public const LOCATION_BEFORE_ALL = 1;    // before all (critical). 1 to not equal with empty values (e.g. (int)null)
    public const LOCATION_KERNEL = 50;        // first
    public const LOCATION_TEMPLATE = 100;    // DEFAULT place
    public const LOCATION_AFTER_TEMPLATE = 150;    // last

    public static function getDefaultLocation(): string
    {
        return self::LOCATION_TEMPLATE;
    }

    public static function getAllLocations(): array
    {
        return [
            self::LOCATION_BEFORE_ALL,
            self::LOCATION_KERNEL,
            self::LOCATION_TEMPLATE,
            self::LOCATION_AFTER_TEMPLATE,
        ];
    }
 

    public static function verifyLocation($location): int
    {
        if (
            !isset($location)
            || !in_array($location, self::getAllLocations(), true)
        )
        {
            return self::getDefaultLocation();
        }
 
        return $location;
    }
}