Backend Development
PHP Tutorial
Explain the related content of PHP file download class that supports breakpoint resume transfer
Explain the related content of PHP file download class that supports breakpoint resume transfer
Jun 11, 2018 am 09:39 AM
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,支持斷點續(xù)傳
* Date: 2013-06-30
* Author: fdipzone
* Ver: 1.0
*
* Func:
* download: 下載文件
* setSpeed: 設置下載速度
* 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,為空則與下載的文件名稱一樣
* @param boolean $reload 是否開啟斷點續(xù)傳
*/
public function download($file, $name='', $reload=false){
if(file_exists($file)){
if($name==''){
$name = basename($file);
}
$fp = fopen($file, 'rb');
$file_size = filesize($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);?//?用于測試,減慢下載速度
????????????}
????????????($fp!=null)?&&?fclose($fp);
????????}else{
????????????return?'';
????????}
????}
????/**?設置下載速度
????*?@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('start','end'), $range);
if(empty($range['start'])){
$range['start'] = 0;
}
if(empty($range['end'])){
$range['end'] = $file_size;
}
return $range;
}
return null;
}
} // class end
?>
demo
<?php
require('FileDownload.class.php');
$file = 'book.zip';
$name = time().'.zip';
$obj = new FileDownload();
$flag = $obj->download($file,?$name);
//$flag?=?$obj->download($file,?$name,?true);?//?斷點續(xù)傳
if(!$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?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?請求，正在等待回應...?200?OK 長度：?10445120?(10.0M)?[application/octet-stream] 正在保存至:?“test.rar” 30%?[============================>?????????????????????????????????????????????????????????????????????]?3,146,580????513K/s??估時?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?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?請求，正在等待回應...?200?OK 長度：?10445120?(10.0M)?[application/octet-stream] 正在保存至:?“test.rar” 30%?[============================>?????????????????????????????????????????????????????????????????????]?3,146,580????515K/s??估時?14s ^C 可以看到,wget?-c不能斷點續(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?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?請求，正在等待回應...?200?OK 長度：?10445120?(10.0M)?[application/octet-stream] 正在保存至:?“test.rar” 20%?[==================>???????????????????????????????????????????????????????????????????????????????]?2,097,720????516K/s??估時?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?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?請求，正在等待回應...?206?Partial?Content 長度：?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?14s??? 2013-06-30?16:53:45?(543?KB/s)?-?已保存?“test.rar”?[10445121/10445121]) 可以看到會從斷點的位置(%20)開始下載。
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.
Related recommendations:
How to filter html tag attribute classes through php
How to use php to replace sensitive characters String related operations
#About PHP traversing folders and file classes and processing classes
The above is the detailed content of Explain the related content of PHP file download class that supports breakpoint resume transfer. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How to get the current session ID in PHP?
Jul 13, 2025 am 03:02 AM
The method to get the current session ID in PHP is to use the session_id() function, but you must call session_start() to successfully obtain it. 1. Call session_start() to start the session; 2. Use session_id() to read the session ID and output a string similar to abc123def456ghi789; 3. If the return is empty, check whether session_start() is missing, whether the user accesses for the first time, or whether the session is destroyed; 4. The session ID can be used for logging, security verification and cross-request communication, but security needs to be paid attention to. Make sure that the session is correctly enabled and the ID can be obtained successfully.
PHP get substring from a string
Jul 13, 2025 am 02:59 AM
To extract substrings from PHP strings, you can use the substr() function, which is syntax substr(string$string,int$start,?int$length=null), and if the length is not specified, it will be intercepted to the end; when processing multi-byte characters such as Chinese, you should use the mb_substr() function to avoid garbled code; if you need to intercept the string according to a specific separator, you can use exploit() or combine strpos() and substr() to implement it, such as extracting file name extensions or domain names.
How do you perform unit testing for php code?
Jul 13, 2025 am 02:54 AM
UnittestinginPHPinvolvesverifyingindividualcodeunitslikefunctionsormethodstocatchbugsearlyandensurereliablerefactoring.1)SetupPHPUnitviaComposer,createatestdirectory,andconfigureautoloadandphpunit.xml.2)Writetestcasesfollowingthearrange-act-assertpat
How to split a string into an array in PHP
Jul 13, 2025 am 02:59 AM
In PHP, the most common method is to split the string into an array using the exploit() function. This function divides the string into multiple parts through the specified delimiter and returns an array. The syntax is exploit(separator, string, limit), where separator is the separator, string is the original string, and limit is an optional parameter to control the maximum number of segments. For example $str="apple,banana,orange";$arr=explode(",",$str); The result is ["apple","bana
JavaScript Data Types: Primitive vs Reference
Jul 13, 2025 am 02:43 AM
JavaScript data types are divided into primitive types and reference types. Primitive types include string, number, boolean, null, undefined, and symbol. The values are immutable and copies are copied when assigning values, so they do not affect each other; reference types such as objects, arrays and functions store memory addresses, and variables pointing to the same object will affect each other. Typeof and instanceof can be used to determine types, but pay attention to the historical issues of typeofnull. Understanding these two types of differences can help write more stable and reliable code.
Using std::chrono in C
Jul 15, 2025 am 01:30 AM
std::chrono is used in C to process time, including obtaining the current time, measuring execution time, operation time point and duration, and formatting analysis time. 1. Use std::chrono::system_clock::now() to obtain the current time, which can be converted into a readable string, but the system clock may not be monotonous; 2. Use std::chrono::steady_clock to measure the execution time to ensure monotony, and convert it into milliseconds, seconds and other units through duration_cast; 3. Time point (time_point) and duration (duration) can be interoperable, but attention should be paid to unit compatibility and clock epoch (epoch)
How to pass a session variable to another page in PHP?
Jul 13, 2025 am 02:39 AM
In PHP, to pass a session variable to another page, the key is to start the session correctly and use the same $_SESSION key name. 1. Before using session variables for each page, it must be called session_start() and placed in the front of the script; 2. Set session variables such as $_SESSION['username']='JohnDoe' on the first page; 3. After calling session_start() on another page, access the variables through the same key name; 4. Make sure that session_start() is called on each page, avoid outputting content in advance, and check that the session storage path on the server is writable; 5. Use ses
How does PHP handle Environment Variables?
Jul 14, 2025 am 03:01 AM
ToaccessenvironmentvariablesinPHP,usegetenv()orthe$_ENVsuperglobal.1.getenv('VAR_NAME')retrievesaspecificvariable.2.$_ENV['VAR_NAME']accessesvariablesifvariables_orderinphp.iniincludes"E".SetvariablesviaCLIwithVAR=valuephpscript.php,inApach
