range.php

См. документацию.

<?php
 
namespace Bitrix\Main\Filter;
 
use Bitrix\Main\UI\Filter\NumberType;
 
class Range
{
    public static function prepareFrom(array &$filter, $name, $value)
    {
        if($value !== '')
        {
            $typeKey = "{$name}_numsel";
            $operation = '>=';
            if(isset($filter[$typeKey]))
            {
                if($filter[$typeKey] === NumberType::MORE)
                {
                    $operation = '>';
                }
                unset($filter[$typeKey]);
            }
            $filter["$operation{$name}"] = $value;
        }
        unset($filter["{$name}_from"]);
    }
 
    public static function prepareTo(array &$filter, $name, $value)
    {
        if($value !== '')
        {
            $typeKey = "{$name}_numsel";
            $operation = '<=';
            if(isset($filter[$typeKey]))
            {
                if($filter[$typeKey] === NumberType::LESS)
                {
                    $operation = '<';
                }
                unset($filter[$typeKey]);
            }
            $filter["$operation{$name}"] = $value;
        }
        unset($filter["{$name}_to"]);
    }
}