function dnlf($dnlf){

if (headers_sent()) {

die('Заголовки отправлены');

}

 

if (ini_get('zlib.output_compression')) {

ini_set('zlib.output_compression', 'Off');

}

 

if (file_exists($dnlf)){

 

$fsize = filesize($dnlf);

$path_parts = pathinfo($dnlf);

$ext = strtolower($path_parts['extension']);

 

$fd = @fopen($dnlf, 'rb');

$f1 = fileinode($dnlf);

$f2 = filemtime($dnlf);

$ftime = gmdate('r', $f2);

 

$arr_types = array(

"sis" => "application/vnd.symbian.install",

"amr" => "audio/amr",

"jad" => "text/vnd.sun.j2me.app-descriptor;charset=UTF-8",

"jar" => "application/java-archive",

"mp4" => "video/mp4",

"3gp" => "video/3gpp",  

"rar" => "application/x-rar-compressed",

"doc" => "application/msword",

"exe" => "application/octet-stream",

"pdf" => "application/pdf",

"zip" => "application/zip",

"mp3" => "audio/mpeg",

"wav" => "audio/x-wav",

"bmp" => "image/bmp",

"gif" => "image/gif",

"jpg" => "image/jpeg",

"png" => "image/png",

"css" => "text/css",

"txt" => "text/plain",

"mpg" => "video/mpeg",

"avi" => "video/x-msvideo",

);  

 

if (in_array($ext, $arr_types)) {

$type = $arr_types[$ext];  

} else {

$type = 'application/force-download';    

}

 

if (isset($_SERVER['HTTP_RANGE'])) {

$range = $_SERVER['HTTP_RANGE'];

$range = str_replace('bytes=', '', $range);

list($range, $end) = explode('-', $range);

 

if (!empty($range)) {

fseek($fd, $range);

}

} else {

$range = 0;

}

 

if ($range) {

header($_SERVER['SERVER_PROTOCOL'] . ' 206 Partial Content');

} else {

header($_SERVER['SERVER_PROTOCOL'] . ' 200 OK');

}

 

header('Last-Modified: ' . $ftime);

header('ETag: ' . sprintf('%x-%x-%x', $f1, $fsize, $f2));

header('Accept-Ranges: bytes');

header('Pragma: public');

header('Expires: 0');

header('Cache-Control: must-revalidate, post-check=0, pre-check=0');

header('Cache-Control: private', false);

header('Content-Type: ' . $type . '');

header('Content-Description: inline; File Transfer');

header('Content-Disposition: attachment; filename="' . basename($dnlf) . '";', false);

header('Content-Transfer-Encoding: binary');

header('Content-Length: ' . ($fsize - $range));

 

if ($range) {

header('Content-Range: bytes ' . $range . '-' . ($fsize - 1) . '/' . $fsize);

}

 

header('Connection: close');  

 

ob_clean();

 

sleep(1);

 

$speed = 1024*8; // 8 - speed/kb

while(!feof($fd) && connection_status()==0) { // проверяем коннект, чтоб процесс не висел при дисконнекте

$buf = fread($fd, $speed); // отдаем файл порцайками , менее напрягает сервер, актуально для файлов более 1 гб

print($buf);

flush();

#sleep(1);  // if speed > 8 разкоментирование приведет к ограничению скорости

}

 

fclose($fd);

 

} else {

die('Файл не найден!');

}

 

}