<?php 
/** 
* 下载远程文件类支持断点续传 
*/
class HttpDownload { 
private $m_url = \"\"; 
private $m_urlpath = \"\"; 
private $m_scheme = \"http\"; 
private $m_host = \"\"; 
private $m_port = \"80\"; 
private $m_user = \"\"; 
private $m_pass = \"\"; 
private $m_path = \"/\"; 
private $m_query = \"\"; 
private $m_fp = \"\"; 
private $m_error = \"\"; 
private $m_httphead = \"\" ; 
private $m_html = \"\"; 
 
/** 
* 初始化 
*/
public function PrivateInit($url){ 
$urls = \"\"; 
$urls = @parse_url($url); 
$this->m_url = $url; 
if(is_array($urls)) { 
$this->m_host = $urls[\"host\"]; 
if(!empty($urls[\"scheme\"])) $this->m_scheme = $urls[\"scheme\"]; 
if(!empty($urls[\"user\"])) $this->m_user = $urls[\"user\"]; 
if(!empty($urls[\"pass\"])) $this->m_pass = $urls[\"pass\"]; 
if(!empty($urls[\"port\"])) $this->m_port = $urls[\"port\"]; 
if(!empty($urls[\"path\"])) $this->m_path = $urls[\"path\"]; 
$this->m_urlpath = $this->m_path; 
if(!empty($urls[\"query\"])) { 
$this->m_query = $urls[\"query\"]; 
$this->m_urlpath .= \"?\".$this->m_query; 
} 
} 
} 
 
/** 
* 打开指定网址 
*/
function OpenUrl($url) { 
#重设各参数 
$this->m_url = \"\"; 
$this->m_urlpath = \"\"; 
$this->m_scheme = \"http\"; 
$this->m_host = \"\"; 
$this->m_port = \"80\"; 
$this->m_user = \"\"; 
$this->m_pass = \"\"; 
$this->m_path = \"/\"; 
$this->m_query = \"\"; 
$this->m_error = \"\"; 
$this->m_httphead = \"\" ; 
$this->m_html = \"\"; 
$this->Close(); 
#初始化系统 
$this->PrivateInit($url); 
$this->PrivateStartSession(); 
} 
 
/** 
* 获得某操作错误的原因 
*/
public function printError() { 
echo \"错误信息：\".$this->m_error; 
echo \"具体返回头：<br>\"; 
foreach($this->m_httphead as $k=>$v) { 
echo \"$k => $v <br>\\r\\n\"; 
} 
} 
 
/** 
* 判别用Get方法发送的头的应答结果是否正确 
*/
public function IsGetOK() { 
if( ereg(\"^2\",$this->GetHead(\"http-state\")) ) { 
return true; 
} else { 
$this->m_error .= $this->GetHead(\"http-state\").\" - \".$this->GetHead(\"http-describe\").\"<br>\"; 
return false; 
} 
} 
 
/** 
* 看看返回的网页是否是text类型 
*/
public function IsText() { 
if (ereg(\"^2\",$this->GetHead(\"http-state\")) && eregi(\"^text\",$this->GetHead(\"content-type\"))) { 
return true; 
} else { 
$this->m_error .= \"内容为非文本类型<br>\"; 
return false; 
} 
} 
/** 
* 判断返回的网页是否是特定的类型 
*/
public function IsContentType($ctype) { 
if (ereg(\"^2\",$this->GetHead(\"http-state\")) && $this->GetHead(\"content-type\") == strtolower($ctype)) { 
return true; 
} else { 
$this->m_error .= \"类型不对 \".$this->GetHead(\"content-type\").\"<br>\"; 
return false; 
} 
} 
 
/** 
* 用 HTTP 协议下载文件 
*/
public function SaveToBin($savefilename) { 
if (!$this->IsGetOK()) return false; 
if (@feof($this->m_fp)) { 
$this->m_error = \"连接已经关闭！\"; 
return false; 
} 
$fp = fopen($savefilename,\"w\") or die(\"写入文件 $savefilename 失败！\"); 
while (!feof($this->m_fp)) { 
@fwrite($fp,fgets($this->m_fp,256)); 
} 
@fclose($this->m_fp); 
return true; 
} 
 
/** 
* 保存网页内容为 Text 文件 
*/
public function SaveToText($savefilename) { 
if ($this->IsText()) { 
$this->SaveBinFile($savefilename); 
} else { 
return \"\"; 
} 
} 
 
/** 
* 用 HTTP 协议获得一个网页的内容 
*/
public function GetHtml() { 
if (!$this->IsText()) return \"\"; 
if ($this->m_html!=\"\") return $this->m_html; 
if (!$this->m_fp||@feof($this->m_fp)) return \"\"; 
while(!feof($this->m_fp)) { 
$this->m_html .= fgets($this->m_fp,256); 
} 
@fclose($this->m_fp); 
return $this->m_html; 
} 
 
/** 
* 开始 HTTP 会话 
*/
public function PrivateStartSession() { 
if (!$this->PrivateOpenHost()) { 
$this->m_error .= \"打开远程主机出错!\"; 
return false; 
} 
if ($this->GetHead(\"http-edition\")==\"HTTP/1.1\") { 
$httpv = \"HTTP/1.1\"; 
} else { 
$httpv = \"HTTP/1.0\"; 
} 
fputs($this->m_fp,\"GET \".$this->m_urlpath.\" $httpv\\r\\n\"); 
fputs($this->m_fp,\"Host: \".$this->m_host.\"\\r\\n\"); 
fputs($this->m_fp,\"Accept: */*\\r\\n\"); 
fputs($this->m_fp,\"User-Agent: Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2)\\r\\n\"); 
#HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束 
if ($httpv==\"HTTP/1.1\") { 
fputs($this->m_fp,\"Connection: Close\\r\\n\\r\\n\"); 
} else { 
fputs($this->m_fp,\"\\r\\n\"); 
} 
$httpstas = fgets($this->m_fp,256); 
$httpstas = split(\" \",$httpstas); 
$this->m_httphead[\"http-edition\"] = trim($httpstas[0]); 
$this->m_httphead[\"http-state\"] = trim($httpstas[1]); 
$this->m_httphead[\"http-describe\"] = \"\"; 
for ($i=2;$i<count($httpstas);$i++) { 
$this->m_httphead[\"http-describe\"] .= \" \".trim($httpstas[$i]); 
} 
while (!feof($this->m_fp)) { 
$line = str_replace(\"\\\"\",\"\",trim(fgets($this->m_fp,256))); 
if($line == \"\") break; 
if (ereg(\":\",$line)) { 
$lines = split(\":\",$line); 
$this->m_httphead[strtolower(trim($lines[0]))] = trim($lines[1]); 
} 
} 
} 
 
/** 
* 获得一个Http头的值 
*/ 
public function GetHead($headname) { 
$headname = strtolower($headname); 
if (isset($this->m_httphead[$headname])) { 
return $this->m_httphead[$headname]; 
} else { 
return \"\"; 
} 
} 
 
/** 
* 打开连接 
*/
public function PrivateOpenHost() { 
if ($this->m_host==\"\") return false; 
$this->m_fp = @fsockopen($this->m_host, $this->m_port, &$errno, &$errstr,10); 
if (!$this->m_fp){ 
$this->m_error = $errstr; 
return false; 
} else { 
return true; 
} 
} 
 
/** 
* 关闭连接 
*/
public function Close(){ 
@fclose($this->m_fp); 
} 
} 
 
#两种使用方法，分别如下： 
 
#打开网页 
$httpdown = new HttpDownload(); 
$httpdown->OpenUrl(\"http://www.google.com.hk\"); 
echo $httpdown->GetHtml(); 
$httpdown->Close(); 
 
 
#下载文件 
$file = new HttpDownload(); # 实例化类 
$file->OpenUrl(\"http://dldir1.qq.com/qqfile/qq/QQ8.2/17724/QQ8.2.exe\"); # 远程文件地址 
$file->SaveToBin(\"qq.exe\"); # 保存路径及文件名 
$file->Close(); # 释放资源