断点下载PHP
① php 怎么写断点续传 有插件也行 求大神
HTTP协议里, 对断点下载有支持.
断点上传单纯靠PHP 是做不了的.
因为普通的浏览器端没那功能.(上传的时候 还是会整个文件编码发送)
想实现的话 , 客户端需要插件了,
客户端可以使用flex实现. 服务端, PHP可以写个webservice 接受文件.可以在网上找找. 关键字: "flex php 上传"
大文件上传, 走 http 是比较费劲儿的. 不稳定是关键.
② php 断点续传
<?php
/**
* PHP-HTTP断点续传实现
* @param string $path: 文件所在路径
* @param string $file: 文件名
* @return void
*/
function download($path,$file) {
$real = $path.'/'.$file;
if(!file_exists($real)) {
return false;
}
$size = filesize($real);
$size2 = $size-1;
$range = 0;
if(isset($_SERVER['HTTP_RANGE'])) {
header('HTTP /1.1 206 Partial Content');
$range = str_replace('=','-',$_SERVER['HTTP_RANGE']);
$range = explode('-',$range);
$range = trim($range[1]);
header('Content-Length:'.$size);
header('Content-Range: bytes '.$range.'-'.$size2.'/'.$size);
} else {
header('Content-Length:'.$size);
header('Content-Range: bytes 0-'.$size2.'/'.$size);
}
header('Accenpt-Ranges: bytes');
header('application/octet-stream');
header("Cache-control: public");
header("Pragma: public");
//解决在IE中下载时中文乱码问题
$ua = $_SERVER['HTTP_USER_AGENT'];
if(preg_match('/MSIE/',$ua)) {
$ie_filename = str_replace('+','%20',urlencode($file));
header('Content-Dispositon:attachment; filename='.$ie_filename);
} else {
header('Content-Dispositon:attachment; filename='.$file);
}
$fp = fopen($real,'rb+');
fseek($fp,$range);
while(!feof($fp)) {
set_time_limit(0);
print(fread($fp,1024));
flush();
ob_flush();
}
fclose($fp);
}
/*End of PHP*/
③ 刚开始接触php没多久， php实现了一个支持断点续传的文件下载，当用迅雷来下载的时候会出现页面无法显示
用系统自带的浏览器下载方可
请参考
补充：
不想直接下载的话，你要找到一个可以复制会话的下载工具。目前我还没见过哪个下载工具可以做到。
因为在你把下载链接拖到迅雷的时候，迅雷建立了一个新的HTTP通讯到目标，也就等于建立了一个新的会话。而要完成这样的下载，需要的是一个合法的会话（会员登录的那个会话），迅雷新建的那个会话显然是一个普通访客（未登录）的会话，所以服务器肯定会拒绝下载请求。
这就是原因。如有不明白，可以发HI问我
④ 断点续传几个小问题(PHP)
第一个问题应该是迅雷的判断，这个我觉得没办法
第二个，你确定那个输出为真的话，echo出的东西在页面上的地方可能没找对，你可以试一下用JS的弹窗：
echo '<script>alert("Yes");</script>";
⑤ php断点调试的几种方法
具体代码如下：
<?php
$ch = curl_init();
$timeout = 5;
curl_setopt ($ch, CURLOPT_URL, '');
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$file_contents = curl_exec($ch);
curl_close($ch);
echo $file_contents;
?>
PHP 独特的语法混合了C、Java、Perl以及PHP自创的语法。
它可以比CGI或者Perl更快速地执行动态网页。用PHP做出的动态页面与其他的编程语言相比，PHP是将程序嵌入到HTML（标准通用标记语言下的一个应用）文档中去执行，
执行效率比完全生成HTML标记的CGI要高许多；
PHP还可以执行编译后代码，编译可以达到加密和优化代码运行，使代码运行更快。
⑥ php断点续传代码怎么写
下载服务器支持断续传才能
用php也就是用HTTP协议去下载数据，断点续传也就是请求前取得文件大小，再下，下到那里记下来，本地初始化一个同样大小的文件，下次请求文件时，给出这个地址，就能从下载服务器得到对应的文件，再写入你上次的文件的对应位置
⑦ 如何在本地端实现php对大文件的断点续下载
function download($path,$file) {
$real = $path.'/'.$file;
if(!file_exists($real)) {
return false;
}
$size = filesize($real);
$size2 = $size-1;
$range = 0;
if(isset($_SERVER['HTTP_RANGE'])) {
header('HTTP /1.1 206 Partial Content');
$range = str_replace('=','-',$_SERVER['HTTP_RANGE']);
$range = explode('-',$range);
$range = trim($range[1]);
header('Content-Length:'.$size);
header('Content-Range: bytes '.$range.'-'.$size2.'/'.$size);
} else {
header('Content-Length:'.$size);
header('Content-Range: bytes 0-'.$size2.'/'.$size);
}
header('Accenpt-Ranges: bytes');
header('application/octet-stream');
header("Cache-control: public");
header("Pragma: public");
⑧ 谁知道关于PHP的断点续传第三方插件哪里有下载谢谢
php有这东西吗？php属于http协议，http是不支持断点续传的，大文件上传可以用SWF上传，有个插件SWFUpload
⑨ php 断点续传怎么做啊！
功能:支持断点续传的下载,能计算传输率,能控制传输率
简易使用方法:
$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:
<?
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 /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
}
}
?>