Выводим размер файла

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function FileSizeConvert($bytes)
{
    $bytes = floatval($bytes);
        $arBytes = array(
            0 => array(
                "UNIT" => "TB",
                "VALUE" => pow(1024, 4)
            ),
            1 => array(
                "UNIT" => "GB",
                "VALUE" => pow(1024, 3)
            ),
            2 => array(
                "UNIT" => "MB",
                "VALUE" => pow(1024, 2)
            ),
            3 => array(
                "UNIT" => "KB",
                "VALUE" => 1024
            ),
            4 => array(
                "UNIT" => "B",
                "VALUE" => 1
            ),
        );
 
    foreach($arBytes as $arItem)
    {
        if($bytes >= $arItem["VALUE"])
        {
            $result = $bytes / $arItem["VALUE"];
            $result = str_replace(".", "," , strval(round($result, 2)))." ".$arItem["UNIT"];
            break;
        }
    }
    return $result;
}

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<?$attached_path = get_attached_file( $row['dokument']['id'] );//получаем путь по файла?>
<?$filesize = wp_filesize($attached_path);?>
<?=FileSizeConvert($filesize)//выводим результат?>