我写了一个php下载中心脚本，对每个用户组进行一些速度限制！
对于vip组我使用了xsendfile并且它工作得很好
但是在必须有速度限制的用户组中我使用了fread（）并强制下载php：
<?php
类httpdownload {
public $data = null;
public $data_len = 0;
public $data_mod = 0;
public $data_type = 0;
public $data_section = 0; //section download
/**
* @var ObjectHandler
**/
public $handler = array('auth' => null);
public $use_resume = true;
public $use_autoexit = false;
public $use_auth = false;
public $filename = null;
public $mime = null;
public $bufsize = 2048;
public $seek_start = 0;
public $seek_end = -1;
public $newfile = null;
/**
* Total bandwidth has been used for this download
* @var int
*/
public $bandwidth = 0;
/**
* Speed limit
* @var float
*/
public $speed = 0;
/*-------------------
| Download Function |
-------------------*/
/**
* Check authentication and get seek position
* @return bool
**/
private function initialize() {
global $HTTP_SERVER_VARS;
if ($this->use_auth) //use authentication
{
if (!$this->_auth()) //no authentication
{
header('WWW-Authenticate: Basic realm="Please enter your username and password"');
header('HTTP/1.0 401 Unauthorized');
header('status: 401 Unauthorized');
if ($this->use_autoexit) exit();
return false;
}
}
if ($this->mime == null) $this->mime = "application/octet-stream"; //default mime
if (isset($_SERVER['HTTP_RANGE']) || isset($HTTP_SERVER_VARS['HTTP_RANGE']))
{
if (isset($HTTP_SERVER_VARS['HTTP_RANGE'])) $seek_range = substr($HTTP_SERVER_VARS['HTTP_RANGE'] , strlen('bytes='));
else $seek_range = substr($_SERVER['HTTP_RANGE'] , strlen('bytes='));
$range = explode('-',$seek_range);
if ($range[0] > 0)
{
$this->seek_start = intval($range[0]);
}
if ($range[1] > 0) $this->seek_end = intval($range[1]);
else $this->seek_end = -1;
if (!$this->use_resume)
{
$this->seek_start = 0;
//header("HTTP/1.0 404 Bad Request");
//header("Status: 400 Bad Request");
//exit;
//return false;
}
else
{
$this->data_section = 1;
}
}
else
{
$this->seek_start = 0;
$this->seek_end = -1;
}
return true;
}
/**
* Send download information header
**/
private function header($size,$seek_start=null,$seek_end=null) {
header('Content-type: ' . $this->mime);
header('Content-Disposition: attachment; filename="' . $this->newfile . '"');
header('Last-Modified: ' . date('D, d M Y H:i:s \G\M\T' , $this->data_mod));
if ($this->data_section && $this->use_resume)
{
header("HTTP/1.0 206 Partial Content");
header("Status: 206 Partial Content");
header('Accept-Ranges: bytes');
header("Content-Range: bytes $seek_start-$seek_end/$size");
header("Content-Length: " . ($seek_end - $seek_start + 1));
}
else
{
header("Content-Length: $size");
}
}
private function download_ex($size)
{
if (!$this->initialize()) return false;
ignore_user_abort(true);
//Use seek end here
if ($this->seek_start > ($size - 1)) $this->seek_start = 0;
if ($this->seek_end <= 0) $this->seek_end = $size - 1;
$this->header($size,$seek,$this->seek_end);
$this->data_mod = time();
return true;
}
/**
* Start download
* @return bool
**/
function download() {
if (!$this->initialize()) return false;
$seek = $this->seek_start;
$speed = $this->speed;
$bufsize = $this->bufsize;
$packet = 1;
//do some clean up
@ob_end_clean();
$old_status = ignore_user_abort(true);
@set_time_limit(0);
$this->bandwidth = 0;
$size = $this->data_len;
if ($this->data_type == 0) //download from a file
{
$size = filesize($this->data);
if ($seek > ($size - 1)) $seek = 0;
if ($this->filename == null) $this->filename = basename($this->data);
$res = fopen($this->data,'rb');
if ($seek) fseek($res , $seek);
if ($this->seek_end < $seek) $this->seek_end = $size - 1;
$this->header($size,$seek,$this->seek_end); //always use the last seek
$size = $this->seek_end - $seek + 1;
while (!(connection_aborted() || connection_status() == 1) && $size > 0)
{
if ($size < $bufsize)
{
echo fread($res , $size);
$this->bandwidth += $size;
}
else
{
echo fread($res , $bufsize);
$this->bandwidth += $bufsize;
}
$size -= $bufsize;
flush();
if ($speed > 0 && ($this->bandwidth > $speed*$packet*1024))
{
sleep(1);
$packet++;
}
}
fclose($res);
}
elseif ($this->data_type == 1) //download from a string
{
if ($seek > ($size - 1)) $seek = 0;
if ($this->seek_end < $seek) $this->seek_end = $this->data_len - 1;
$this->data = substr($this->data , $seek , $this->seek_end - $seek + 1);
if ($this->filename == null) $this->filename = time();
$size = strlen($this->data);
$this->header($this->data_len,$seek,$this->seek_end);
while (!connection_aborted() && $size > 0) {
if ($size < $bufsize)
{
$this->bandwidth += $size;
}
else
{
$this->bandwidth += $bufsize;
}
echo substr($this->data , 0 , $bufsize);
$this->data = substr($this->data , $bufsize);
$size -= $bufsize;
flush();
if ($speed > 0 && ($this->bandwidth > $speed*$packet*1024))
{
sleep(1);
$packet++;
}
}
} else if ($this->data_type == 2) {
//just send a redirect header
header('location: ' . $this->data);
}
if ($this->use_autoexit) exit();
//restore old status
ignore_user_abort($old_status);
set_time_limit(ini_get("max_execution_time"));
return true;
}
function set_byfile($dir) {
if (is_readable($dir) && is_file($dir)) {
$this->data_len = 0;
$this->data = $dir;
$this->data_type = 0;
$this->data_mod = filemtime($dir);
return true;
} else return false;
}
function set_bydata($data) {
if ($data == '') return false;
$this->data = $data;
$this->data_len = strlen($data);
$this->data_type = 1;
$this->data_mod = time();
return true;
}
function set_byurl($data) {
$this->data = $data;
$this->data_len = 0;
$this->data_type = 2;
return true;
}
function set_lastmodtime($time) {
$time = intval($time);
if ($time <= 0) $time = time();
$this->data_mod = $time;
}
/**
* Check authentication
* @return bool
**/
function _auth() {
if (!isset($_SERVER['PHP_AUTH_USER'])) return false;
if (isset($this->handler['auth']) && function_exists($this->handler['auth']))
{
return $this->handler['auth']('auth' , $_SERVER['PHP_AUTH_USER'],$_SERVER['PHP_AUTH_PW']);
}
else return true; //you must use a handler
}
}
＆GT;
下载动作：
private function downloader($filename,$type,$name,$speed_limit)
{
require_once(ROOT_PATCH . "bcore/HttpDownloader.class.php");
$object = new httpdownload();
$object->newfile = $name;
switch ($type) {
case 'resume_speed':
case 'noresume_speed':
case 'resume':
case 'noresume':
$object->set_byfile($filename);
if ($type == 'noresume' || $type == 'noresume_speed') $object->use_resume = false;
if ($type == 'resume_speed' || $type == 'noresume_speed' ) $object->speed = $speed_limit;
$object->download();
break;
case 'data':
case 'dataresume':
$data = implode('' , file($filename));
$object->set_bydata($data);
if ($_SERVER['download'] != 'dataresume') $object->use_resume = false;
$object->filename = basename($filename);
$object->download();
break;
case 'auth':
$object->set_byfile($filename);
$object->use_auth = true;
$object->handler['auth'] = "test_auth";
$object->download();
break;
case 'url':
$object->set_byurl('http://www.php.net/get/php_manual_chm.zip/from/cr.php.net/mirror');
$object->download();
break;
}
}
$ type =“resume”;在上面的开关
但是有问题！
注意：我的最高互联网下载速度为60kb / s
当我将下载URL复制到IDM时添加Url文件下载速度非常快且很好：
screen shot for copy download url to IDM Add
但是当我点击url和idm从浏览器文件中自动获取链接下载时连接速度非常慢!!
并且在一些第二速度之后是0kb / s~4kb / s
这有什么问题？
