非常好用的PHP下载类
这是一个功能齐全的 PHP 下载类,基本原理是将文件切片处理,这里贴上代码附调用方法,可以研究和使用。
<?php
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, LOG_PATH.'download.error');
$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 -= $bufsize;
@ob_flush();
@flush();
if($speed > 0 && ($this->bandwidth > $speed*$packet*1024)){
sleep(1);
$packet++;
}
}
fclose($res);
}else if($this->data_type == 1){//download from a string
if($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 -= $bufsize;
@ob_flush();
@flush();
if($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==$this->sentSize ){
error_log("end download\n", 3, LOG_PATH.'download.error');
}else{
error_log("download is canceled\n", 3, LOG_PATH.'download.error');
}
if($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, LOG_PATH.'download.error');
}
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
}
}
}
调用方法如下:
$object = new httpdownload();
$object->set_byfile($file);//服务器文件名,包括路径
$object->filename = $downName;//下载另存为的文件名
$object->download();
转载请注明: 转载自Ryan 是菜鸟 | LNMP 技术栈笔记
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