Home  >  Article  >  Backend Development  >  PHP download remote file class supports breakpoint resume download

PHP download remote file class supports breakpoint resume download

WBOY
WBOYOriginal
2016-07-29 08:39:111154browse

Easy to use:

Copy the code The code is as follows:


$object = new httpdownload();
$object->set_byfile($file)%N#H#%;//Server file name, Include path
$object->filename = $filename;//Download the file name saved as
$object->download();


3. Source file:

Copy code The code is as follows:


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 (!$this->_auth()) //no authentication
{
header('WWW-Authenticate: Basic realm="Please enter your username and password"');
header('HTTP/1.0 401 Unauthorized');
header('status: 401 Unauthorized');
if ($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;
}
$this->sentSize=0;
return true;
}
function header($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 GMT' , $this->data_mod));
if ($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 downloadn", 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==$this->sentSize )error_log("end downloadn", 3,"/usr/local/www/apache22/LOGS/apache22_php.err");
else error_log("download is canceledn", 3,"/usr/local/www/apache22/LOGS/apache22_php.err");
if ($this->use_autoexit) exit();
//restore old status
ignore_user_abort($old_status);
set_time_limit(ini_get("max_execution_time"));
}
catch(Exception $e)
{
error_log("cancel downloadn".$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
}
}
?>


以上就介绍了 php下载远程文件类支持断点续传,包括了方面的内容,希望对PHP教程有兴趣的朋友有所帮助。

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn