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Explain the related content of PHP file download class that supports breakpoint resume transfer

jacklove

Jun 11, 2018 am 09:39 AM

php http

php supports breakpoint resumption, mainly relying on the header HTTP_RANGE in the HTTP protocol.
HTTP breakpoint resume download principle
Http header Range, Content-Range()
Range and Content are generally used in HTTP headers only for breakpoint downloads -Range entity header,
In the Range user request header, specify the position of the first byte and the position of the last byte, such as (Range: 200-300)
Content-Range is used for response headers
Request to download the entire file:
GET /test.rar HTTP/1.1
Connection: close
Host: 116.1.219.219
Range: bytes=0-801 //General requests to download the entire file are bytes =0- or do not use this header
Generally normal response
HTTP/1.1 200 OK
Content-Length: 801
Content-Type: application/octet-stream
Content-Range: bytes 0 -800/801 //801: Total file size
FileDownload.class.php

<?php
/** php下載類(lèi),支持?jǐn)帱c(diǎn)續(xù)傳
*   Date:   2013-06-30
*   Author: fdipzone
*   Ver:    1.0
*
*   Func:
*   download: 下載文件
*   setSpeed: 設(shè)置下載速度
*   getRange: 獲取header中Range
*/
class FileDownload{ // class start
    private $_speed = 512;   // 下載速度
    /** 下載
    * @param String  $file   要下載的文件路徑
    * @param String  $name   文件名稱(chēng),為空則與下載的文件名稱(chēng)一樣
    * @param boolean $reload 是否開(kāi)啟斷點(diǎn)續(xù)傳
    */
    public function download($file, $name=&#39;&#39;, $reload=false){
        if(file_exists($file)){
            if($name==&#39;&#39;){
                $name = basename($file);
            }
            $fp = fopen($file, &#39;rb&#39;);
            $file_size = filesize($file);
            $ranges = $this->getRange($file_size);
????????????header('cache-control:public');
????????????header('content-type:application/octet-stream');
????????????header('content-disposition:attachment;?filename='.$name);
????????????if($reload?&&?$ranges!=null){?//?使用續(xù)傳
????????????????header('HTTP/1.1?206?Partial?Content');
????????????????header('Accept-Ranges:bytes');
????????????????
????????????????//?剩余長(zhǎng)度
????????????????header(sprintf('content-length:%u',$ranges['end']-$ranges['start']));
????????????????
????????????????//?range信息
????????????????header(sprintf('content-range:bytes?%s-%s/%s',?$ranges['start'],?$ranges['end'],?$file_size));
????????????????
????????????????//?fp指針跳到斷點(diǎn)位置
????????????????fseek($fp,?sprintf('%u',?$ranges['start']));
????????????}else{
????????????????header('HTTP/1.1?200?OK');
????????????????header('content-length:'.$file_size);
????????????}
????????????while(!feof($fp)){
????????????????echo?fread($fp,?round($this->_speed*1024,0));
????????????????ob_flush();
????????????????//sleep(1);?//?用于測(cè)試,減慢下載速度
????????????}
????????????($fp!=null)?&&?fclose($fp);
????????}else{
????????????return?'';
????????}
????}
????/**?設(shè)置下載速度
????*?@param?int?$speed
????*/
????public?function?setSpeed($speed){
????????if(is_numeric($speed)?&&?$speed>16?&&?$speed<4096){
            $this->_speed?=?$speed;
????????}
????}
????/**?獲取header?range信息
????*?@param??int???$file_size?文件大小
????*?@return?Array
????*/
????private?function?getRange($file_size){
????????if(isset($_SERVER['HTTP_RANGE'])?&&?!empty($_SERVER['HTTP_RANGE'])){
????????????$range?=?$_SERVER['HTTP_RANGE'];
????????????$range?=?preg_replace('/[\s|,].*/',?'',?$range);
????????????$range?=?explode('-',?substr($range,?6));
????????????if(count($range)<2){
                $range[1] = $file_size;
            }
            $range = array_combine(array(&#39;start&#39;,&#39;end&#39;), $range);
            if(empty($range[&#39;start&#39;])){
                $range[&#39;start&#39;] = 0;
            }
            if(empty($range[&#39;end&#39;])){
                $range[&#39;end&#39;] = $file_size;
            }
            return $range;
        }
        return null;
    }
} // class end
?>

demo

<?php
require(&#39;FileDownload.class.php&#39;);
$file = &#39;book.zip&#39;;
$name = time().&#39;.zip&#39;;
$obj = new FileDownload();
$flag = $obj->download($file,?$name);
//$flag?=?$obj->download($file,?$name,?true);?//?斷點(diǎn)續(xù)傳
if(!$flag){
????echo?'file?not?exists';
}
?>

Breakpoint resume test method:
Use the linux wget command to test the download, wget -c -O file http://xxx
1. Turn off breakpoint resumption first
$flag = $obj->download($file, $name);

fdipzone@ubuntu:~/Downloads$?wget?-O?test.rar?http://demo.fdipzone.com/demo.php
--2013-06-30?16:52:44--??http://demo.fdipzone.com/demo.php
正在解析主機(jī)?demo.fdipzone.com...?127.0.0.1
正在連接?demo.fdipzone.com|127.0.0.1|:80...?已連接。
已發(fā)出?HTTP?請(qǐng)求，正在等待回應(yīng)...?200?OK
長(zhǎng)度：?10445120?(10.0M)?[application/octet-stream]
正在保存至:?“test.rar”
30%?[============================>?????????????????????????????????????????????????????????????????????]?3,146,580????513K/s??估時(shí)?14s
^C
fdipzone@ubuntu:~/Downloads$?wget?-c?-O?test.rar?http://demo.fdipzone.com/demo.php
--2013-06-30?16:52:57--??http://demo.fdipzone.com/demo.php
正在解析主機(jī)?demo.fdipzone.com...?127.0.0.1
正在連接?demo.fdipzone.com|127.0.0.1|:80...?已連接。
已發(fā)出?HTTP?請(qǐng)求，正在等待回應(yīng)...?200?OK
長(zhǎng)度：?10445120?(10.0M)?[application/octet-stream]
正在保存至:?“test.rar”
30%?[============================>?????????????????????????????????????????????????????????????????????]?3,146,580????515K/s??估時(shí)?14s
^C
可以看到,wget?-c不能斷點(diǎn)續(xù)傳

2. Enable breakpoint resume download
$flag = $obj->download($file, $name, true );

fdipzone@ubuntu:~/Downloads$?wget?-O?test.rar?http://demo.fdipzone.com/demo.php
--2013-06-30?16:53:19--??http://demo.fdipzone.com/demo.php
正在解析主機(jī)?demo.fdipzone.com...?127.0.0.1
正在連接?demo.fdipzone.com|127.0.0.1|:80...?已連接。
已發(fā)出?HTTP?請(qǐng)求，正在等待回應(yīng)...?200?OK
長(zhǎng)度：?10445120?(10.0M)?[application/octet-stream]
正在保存至:?“test.rar”
20%?[==================>???????????????????????????????????????????????????????????????????????????????]?2,097,720????516K/s??估時(shí)?16s
^C
fdipzone@ubuntu:~/Downloads$?wget?-c?-O?test.rar?http://demo.fdipzone.com/demo.php
--2013-06-30?16:53:31--??http://demo.fdipzone.com/demo.php
正在解析主機(jī)?demo.fdipzone.com...?127.0.0.1
正在連接?demo.fdipzone.com|127.0.0.1|:80...?已連接。
已發(fā)出?HTTP?請(qǐng)求，正在等待回應(yīng)...?206?Partial?Content
長(zhǎng)度：?10445121?(10.0M)，7822971?(7.5M)?字節(jié)剩余?[application/octet-stream]
正在保存至:?“test.rar”
100%[++++++++++++++++++++++++=========================================================================>]?10,445,121???543K/s???花時(shí)?14s???
2013-06-30?16:53:45?(543?KB/s)?-?已保存?“test.rar”?[10445121/10445121])
可以看到會(huì)從斷點(diǎn)的位置(%20)開(kāi)始下載。

This article explains the relevant content of PHP’s file download class that supports breakpoint resume transfer. For more related content, please pay attention to the PHP Chinese website.

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