PHP file download class that supports breakpoint resumption (source code attached)-PHP Tutorial-php.cn

PHP file download class that supports breakpoint resumption (source code attached)

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Release： 2016-07-25 08:55:24

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/**PHP download class, supports breakpoint resume
* Date: 2013-06-30
* Author: fdipzone
* Ver: 1.0
* edit: ww.jbxue.com
* Func:
* download: Download file
* setSpeed : Set the download speed
* getRange: Get the Range in the header
*/
class FileDownload{ // class start
private $_speed = 512; // 下载速度
/**Download
* @param String $file The path of the file to be downloaded
* @param String $name The file name, if it is empty, it will be the same as the downloaded file name
* @param boolean $reload Whether to enable breakpoint resumption
*/
public function download($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 && $ranges!=null){ // 使用续传
header('HTTP/1.1 206 Partial Content');
header('Accept-Ranges:bytes');
// 剩余长度
header(sprintf('content-length:%u',$ranges['end']-$ranges['start']));
// range信息
header(sprintf('content-range:bytes %s-%s/%s', $ranges['start'], $ranges['end'], $file_size));
// fp指针跳到断点位置
fseek($fp, sprintf('%u', $ranges['start']));
}else{
header('HTTP/1.1 200 OK');
header('content-length:'.$file_size);
}
while(!feof($fp)){
echo fread($fp, round($this->_speed*1024,0));
ob_flush();
//sleep(1); // 用于测试,减慢下载速度
}
($fp!=null) && fclose($fp);
}else{
return '';
}
}
/**Set download speed
* @param int $speed
*/
public function setSpeed($speed){
if(is_numeric($speed) && $speed>16 && $speed<4096){
$this->_speed = $speed;
}
}
/**Get header range information
* @param int $file_size file size
* @return Array
*/
private function getRange($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
?>

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2，演示示例 demo.php

require('FileDownload.class.php');
$file = 'book.zip';
$name = time().'.zip';
$obj = new FileDownload();
$flag = $obj->download($file, $name);
//$flag = $obj->download($file, $name, true); // 断点续传
if(!$flag){
echo 'file not exists';
}
?>

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断点续传测试方法: 使用linux wget命令去测试下载, wget -c -O file http://xxx

1，先关闭断点续传

$flag = $obj->download($file, $name);

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Use wget command to test breakpoint resumption:

root@jbxue:~/Downloads$ wget -O test.rar http://demo.fdipzone.com/demo.php
--2013-06-30 16:52:44-- http: //demo.fdipzone.com/demo.php
Resolving host demo.fdipzone.com... 127.0.0.1
Connecting demo.fdipzone.com|127.0.0.1|:80... Connected.
HTTP request sent, waiting for response... 200 OK
Length: 10445120 (10.0M) [application/octet-stream]
Saving to: “test.rar”
30% [======== =====================> ] 3,146,580 513K/s Estimated time 14s
^C
root@jbxue:~/Downloads$ wget -c -O test. rar http://demo.fdipzone.com/demo.php
--2013-06-30 16:52:57-- http://demo.fdipzone.com/demo.php
Resolving host demo.fdipzone. com... 127.0.0.1
Connecting demo.fdipzone.com|127.0.0.1|:80... Connected.
HTTP request sent, waiting for response... 200 OK
Length: 10445120 (10.0M) [application/octet-stream]
Saving to: “test.rar”
30% [======== =====================> ] 3,146,580 515K/s Estimated time 14s
^C

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You can see it with wget -c The download cannot be resumed from a interrupted point.

2. Enable breakpoint resumption

$flag = $obj->download($file, $name, true);

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Use the wget command to test the resume function.

root@jbxue:~/Downloads$ wget -O test.rar http://demo.fdipzone.com/demo.php
--2013-06-30 16:53:19-- http: //demo.fdipzone.com/demo.php
Resolving host demo.fdipzone.com... 127.0.0.1
Connecting demo.fdipzone.com|127.0.0.1|:80... Connected.
HTTP request sent, waiting for response... 200 OK
Length: 10445120 (10.0M) [application/octet-stream]
Saving to: “test.rar”
20% [====== ============> ] 2,097,720 516K/s Estimated time 16s
^C
root@jbxue:~/Downloads$ wget -c -O test.rar http://demo.fdipzone. com/demo.php
--2013-06-30 16:53:31-- http://demo.fdipzone.com/demo.php
Resolving host demo.fdipzone.com... 127.0.0.1
Resolving Connect demo.fdipzone.com|127.0.0.1|:80... Connected.
HTTP request sent, waiting for response... 206 Partial Content
Length: 10445121 (10.0M), 7822971 (7.5M) Bytes remaining [application/octet-stream]
Saving to: “test.rar”
100%[++++++++++++++++++++++++====================== =========>] 10,445,121 543K/s took 14s
2013-06-30 16:53:45 (543 KB/s) - Saved "test.rar" [10445121/10445121] )