php下载远程文件类(支持断点续传)

　　简易使用方法:
复制代码 代码如下:
$object = new httpdownload();
$object->set_byfile($file)%N#H#%;//服务器文件名,包括路径
$object->filename = $filename;//下载另存为的文件名
$object->download();


3.源文件:
复制代码 代码如下:
<?
class httpdownload {
var $data = null;
var $data_len = 0;
var $data_mod = 0;
var $data_type = 0;
var $data_section = 0; //section download
var $sentSize=0;
var $handler = array(auth => null);
var $use_resume = true;
var $use_autoexit = false;
var $use_auth = false;
var $filename = null;
var $mime = null;
var $bufsize = 2048;
var $seek_start = 0;
var $seek_end = -1;
var $totalsizeref = 0;
var $bandwidth = 0;
var $speed = 0;
function initialize() {
global $HTTP_SERVER_VARS;
if ($this->use_auth) //use authentication
{
if (!$this->_auth()) //no authentication
{
header(
header(HTTP/1.0 401 Unauthorized);
header(status: 401 Unauthorized);
if ($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;
}
$this->sentSize=0;
return true;
}
function header($size,$seek_start=null,$seek_end=null) {
header(Content-type: . $this->mime);
header(Content-Disposition: attachment; filename= . $this->filename . );
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: $size);
}
}
function download_ex($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);
$this->data_mod = time();
return true;
}
function download() {
if (!$this->initialize()) return false;
try
{
error_log(begin download\n, 3,/usr/local/www/apache22/LOGS/apache22_php.err);
$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;
$this->sentSize+=$size;
}
else
{
echo fread($res , $bufsize);
$this->bandwidth += $bufsize;
$this->sentSize+=$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;
$this->sentSize+=$size;
}
else
{
$this->bandwidth += $bufsize;
$this->sentSize+=$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->totalsizeref==$this->sentSize )error_log(end download\n, 3,/usr/local/www/apache22/LOGS/apache22_php.err);
else error_log(download is canceled\n, 3,/usr/local/www/apache22/LOGS/apache22_php.err);
if ($this->use_autoexit) exit();
//restore old status
ignore_user_abort($old_status);
set_time_limit(ini_get(max_execution_time));
}
catch(Exception $e)
{
error_log(cancel download\n.$e, 3,/usr/local/www/apache22/LOGS/apache22_php.err);
}
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);
$this->totalsizeref = filesize($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 = $time;
}
function _auth() {
if (!isset($_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
}
}
?>