Файл для скачивания файла, будет скачивать файл оставаясь на текущей странице. Вызывать так download.php?id=123

download.php

<?
require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");


function download_translit($filename) {
   static $tbl = array(
      'а'=>'a', 'б'=>'b', 'в'=>'v', 'г'=>'g', 'д'=>'d', 'е'=>'e', 'ж'=>'g', 'з'=>'z',
      'и'=>'i', 'й'=>'y', 'к'=>'k', 'л'=>'l', 'м'=>'m', 'н'=>'n', 'о'=>'o', 'п'=>'p',
      'р'=>'r', 'с'=>'s', 'т'=>'t', 'у'=>'u', 'ф'=>'f', 'ы'=>'y', 'э'=>'e', 'А'=>'A',
      'Б'=>'B', 'В'=>'V', 'Г'=>'G', 'Д'=>'D', 'Е'=>'E', 'Ж'=>'G', 'З'=>'Z', 'И'=>'I',
      'Й'=>'Y', 'К'=>'K', 'Л'=>'L', 'М'=>'M', 'Н'=>'N', 'О'=>'O', 'П'=>'P', 'Р'=>'R',
      'С'=>'S', 'Т'=>'T', 'У'=>'U', 'Ф'=>'F', 'Ы'=>'Y', 'Э'=>'E', 'ё'=>"yo", 'х'=>"h",
      'ц'=>"ts", 'ч'=>"ch", 'ш'=>"sh", 'щ'=>"shch", 'ь'=>"", 'ъ'=>"", 'ю'=>"yu", 'я'=>"ya",
      'Ё'=>"YO", 'Х'=>"H", 'Ц'=>"TS", 'Ч'=>"CH", 'Ш'=>"SH", 'Щ'=>"SHCH", 'Ъ'=>"", 'Ь'=>"",
      'Ю'=>"YU", 'Я'=>"YA",
      '№'=>"", ' '=>"_", '«'=>"_", '»'=>"_", '-'=>"_", '/'=>"_", '"'=>"_", '('=>"_", ')'=>"_",
   );
   
   return preg_replace("/__+/","_", strtr(trim($filename), $tbl));
}


if ($arFile = CFile::GetByID( IntVal($_GET['id']) )->Fetch()) { // if found file
	$file_path = $_SERVER["DOCUMENT_ROOT"] . '/upload/'. $arFile["SUBDIR"].'/'.$arFile["FILE_NAME"];
	
	
	// Set headers 
	header("Cache-Control: public"); 
	header("Content-Description: File Transfer"); 
	header("Content-Disposition: attachment; filename=".download_translit($arFile["ORIGINAL_NAME"])); 
	header('Content-Type: application/octet-stream'); 
	header("Content-Transfer-Encoding: binary"); 
	header('Expires: 0'); 
	header('Cache-Control: must-revalidate'); 
	header('Pragma: public'); 
	header('Content-Length: '.$arFile["FILE_SIZE"]); 
	
	// Read the file from disk 
	ob_clean(); 
	
	
	flush(); 
	readfile($file_path); 
	exit; 
} else {
   die('File not found');
}


require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/epilog_after.php");?>