php 实现断点续传（下载文件）

<?php
/** php下载类,支持断点续传
* download: 下载文件
* setSpeed: 设置下载速度
* getRange: 获取header中Range
*/

class FileDownload{

/** 下载
* @param String $file 要下载的文件路径
* @param String $name 文件名称,为空则与下载的文件名称一样
* @param boolean $reload 是否开启断点续传
*/
public function download($file, $name='', $reload=false){
$fp = @fopen($file, 'rb');
if($fp){
if($name==''){
$name = basename($file);
}
$header_array = get_headers($file, true);
//var_dump($header_array);die;
// 下载本地文件，获取文件大小
if (!$header_array) {
$file_size = filesize($file);
} else {
$file_size = $header_array['Content-Length'];
}
$ranges = $this->getRange($file_size);
$ua = $_SERVER["HTTP_USER_AGENT"];//判断是什么类型浏览器
header('cache-control:public');
header('content-type:application/octet-stream');

$encoded_filename = urlencode($name);
$encoded_filename = str_replace("+", "%20", $encoded_filename);

//解决下载文件名乱码
if (preg_match("/MSIE/", $ua) || preg_match("/Trident/", $ua) ){
header('Content-Disposition: attachment; filename="' .$encoded_filename . '"');
} else if (preg_match("/Firefox/", $ua)) {
header('Content-Disposition: attachment; filename*="utf8\'\'' . $name . '"');
}else if (preg_match("/Chrome/", $ua)) {
header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
} else {
header('Content-Disposition: attachment; filename="' . $name . '"');
}
//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'], $file_size));
//file_put_contents('test.log',sprintf('content-length:%u',$ranges['end']-$ranges['start']),FILE_APPEND);
// fp指针跳到断点位置
fseek($fp, sprintf('%u', $ranges['start']));
}else{
file_put_contents('test.log','2222',FILE_APPEND);
header('HTTP/1.1 200 OK');
header('content-length:'.$file_size);
}

while(!feof($fp)){
//echo fread($fp, round($this->_speed*1024,0));
//echo fread($fp, $file_size);
echo fread($fp, 4096);
ob_flush();
}

($fp!=null) && fclose($fp);
}else{
return '';
}
}

/** 设置下载速度
* @param int $speed
*/
public function setSpeed($speed){
if(is_numeric($speed) && $speed>16 && $speed<4096){
$this->_speed = $speed;
}
}

/** 获取header range信息
* @param int $file_size 文件大小
* @return Array
*/
private function getRange($file_size){
//file_put_contents('range.log', json_encode($_SERVER), FILE_APPEND);
if(isset($_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;
}
}

$obj = new FileDownload();

// print_r($obj);
// exit();
$obj->download('./vmware10_46138.rar','', true);

?>