<?php 
/** 
* 下載遠(yuǎn)程文件類支持?jǐn)帱c續(xù)傳 
*/
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; 
} 
} 
} 
 
/** 
* 打開指定網(wǎng)址 
*/
function OpenUrl($url) { 
#重設(shè)各參數(shù) 
$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(); 
#初始化系統(tǒng) 
$this->PrivateInit($url); 
$this->PrivateStartSession(); 
} 
 
/** 
* 獲得某操作錯誤的原因 
*/
public function printError() { 
echo "錯誤信息：".$this->m_error; 
echo "具體返回頭：<br>"; 
foreach($this->m_httphead as $k=>$v) { 
echo "$k => $v <br>\r\n"; 
} 
} 
 
/** 
* 判別用Get方法發(fā)送的頭的應(yīng)答結(jié)果是否正確 
*/
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; 
} 
} 
 
/** 
* 看看返回的網(wǎng)頁是否是text類型 
*/
public function IsText() { 
if (ereg("^2",$this->GetHead("http-state")) && eregi("^text",$this->GetHead("content-type"))) { 
return true; 
} else { 
$this->m_error .= "內(nèi)容為非文本類型<br>"; 
return false; 
} 
} 
/** 
* 判斷返回的網(wǎng)頁是否是特定的類型 
*/
public function IsContentType($ctype) { 
if (ereg("^2",$this->GetHead("http-state")) && $this->GetHead("content-type") == strtolower($ctype)) { 
return true; 
} else { 
$this->m_error .= "類型不對 ".$this->GetHead("content-type")."<br>"; 
return false; 
} 
} 
 
/** 
* 用 HTTP 協(xié)議下載文件 
*/
public function SaveToBin($savefilename) { 
if (!$this->IsGetOK()) return false; 
if (@feof($this->m_fp)) { 
$this->m_error = "連接已經(jīng)關(guān)閉！"; 
return false; 
} 
$fp = fopen($savefilename,"w") or die("寫入文件 $savefilename 失敗！"); 
while (!feof($this->m_fp)) { 
@fwrite($fp,fgets($this->m_fp,256)); 
} 
@fclose($this->m_fp); 
return true; 
} 
 
/** 
* 保存網(wǎng)頁內(nèi)容為 Text 文件 
*/
public function SaveToText($savefilename) { 
if ($this->IsText()) { 
$this->SaveBinFile($savefilename); 
} else { 
return ""; 
} 
} 
 
/** 
* 用 HTTP 協(xié)議獲得一個網(wǎng)頁的內(nèi)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; 
} 
 
/** 
* 開始 HTTP 會話 
*/
public function PrivateStartSession() { 
if (!$this->PrivateOpenHost()) { 
$this->m_error .= "打開遠(yuǎn)程主機(jī)出錯!"; 
return false; 
} 
if ($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($this->m_fp,"User-Agent: Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2)\r\n"); 
#HTTP1.1協(xié)議必須指定文檔結(jié)束后關(guān)閉鏈接,否則讀取文檔時無法使用feof判斷結(jié)束 
if ($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]); 
} 
} 
} 
 
/** 
* 獲得一個Http頭的值 
*/ 
public function GetHead($headname) { 
$headname = strtolower($headname); 
if (isset($this->m_httphead[$headname])) { 
return $this->m_httphead[$headname]; 
} else { 
return ""; 
} 
} 
 
/** 
* 打開連接 
*/
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; 
} 
} 
 
/** 
* 關(guān)閉連接 
*/
public function Close(){ 
@fclose($this->m_fp); 
} 
} 
 
#兩種使用方法，分別如下： 
 
#打開網(wǎng)頁 
$httpdown = new HttpDownload(); 
$httpdown->OpenUrl("http://www.google.com.hk"); 
echo $httpdown->GetHtml(); 
$httpdown->Close(); 
 
 
#下載文件 
$file = new HttpDownload(); # 實例化類 
$file->OpenUrl("http://dldir1.qq.com/qqfile/qq/QQ8.2/17724/QQ8.2.exe"); # 遠(yuǎn)程文件地址 
$file->SaveToBin("qq.exe"); # 保存路徑及文件名 
$file->Close(); # 釋放資源