php下載取得遠端圖片函數(可偽造來路)

//下載取得遠端圖片
function DownImageKeep($gurl, $rfurl, $filename, $gcookie="", $ JumpCount =0, $maxtime=30)
{
 $urlinfos = GetHostInfo($gurl);
 $ghost = trim($urlinfos['host']);
 if($ghost== '')
 {
 return FALSE;
 }
 $gquery = $urlinfos['query'];
 if($gcookie=="" && !empty($rfurl))
 {
 $gcookie = RefurlCookie($rfurl);
 }
 $sessionQuery = "GET $gquery HTTP/1.1rn";
 $sessionQuery .= "主機: $ghostrn";
 $sessionQuery .= "引用者: $rfurlrn";
 $sessionQuery .= "接受: */*rn";
 $sessionQuery .= "用戶代理: Mozilla/4.0 (相容; MSIE 5.00 ; Windows 98)rn";
 if($gcookie!="" && !preg_match("/[rn]/", $gcookie))
 {
 $sessionQuery .= $gcookie."rn ";
 }
 $sessionQuery .= "連線：Keep-Alivenrn";
 $errno = "";
 $errstr = "";
 $m_fp = fsock($ghost,open 80, $errno, $errstr,10);
 fwrite($m_fp,$sessionQuery);
 $lnum = 0;

 //取得詳細回應頭
 $m_httphead = Array ();
 $httpsstas =explode(" ",fgets($m_fp,256));
 $m_httphead["http-edition"] = trim($httpsstas[0]);
 $m_httphead ["http-state"] = trim($httpsstas[1]);
 while(!feof($m_fp))
 {
 $line = trim(fgets($m_fp,256));
 if($line == "" || $lnum>100)
 {
 中斷;
 }
 $hkey = "";
 $hvalue = "";
 $v = 0;
 for($i=0; $i {
 if($v==1)
 {
 $hvalue .= $line [$i];
 }
 if($line[$i]==":")
 {
 $v = 1;
 }
 if($v==0)
 {
 $hkey .= $line[$i];
 }
 }
 $hkey = trim($hkey);
 if($hkey!="")
 {
 $m_httphead[strtolower($hkey)] = trim($hvalue);
 }
 }

 // 分析回傳記錄
 if(preg_match("/^3/", $m_httphead["http-state"]))
 {
 if(isset($m_httphead["location"]) && $JumpCount {
 $JumpCount ;
 DownImageKeep($gurl,$rfurl,$filename,$gcookie,$JumpCount);
 }
 else
 {
 返回FALSE ;
 }
 }
 if(!preg_match("/^2/", $m_httphead["http-state"]))
 {
 return FALSE;
 }
 if(!isset($m_httphead))
 {
 return FALSE;
 }
 $contentLength = $m_httphead['content-length'];

 //保存🎜> //保存檔案
 $fp = fopen($filename,"w") or die("寫入檔案：{$filename} 失敗！");
 $i=0;
 $okdata = "";
 $starttime = time();
 while(!feof($m_fp))
 {
 $ okdata .= fgetc($m_fp);
 $i ;

 // 超時結束
 if(time()-$starttime>$maxtime)
 {
 break; 🎜 > }

 //到達指定大小結束
 if($i >= $contentLength)
 {
 break;
 }
 }
 if( $okdata !="")
 {
 fwrite($fp,$okdata)
 }
 fclose($fp)
 if($okdata=="")
 {
 {
 @unlink($filename);
 fclose($m_fp);
 回傳FALSE;
 fclose($m_fp)
 回傳TRUE;

/**
 回傳TRUE; function RefurlCookie($gurl)
{
 全域$gcookie,$lastRfurl;
 $gurl = trim($gurl)
 if(!empty($gcookie) & $lastRfookie) & $lastRfurl =$gurl)
 {
 return $gcookie;
 }
 else
 {
 $lastRfurl=$gurl;
 }
 if(trim($gurl) =='')
 {
 return '';
 }
 $urlinfos = GetHostInfo($gurl);
 $ghost = $urlinfos['host'];
 $ gquery = $urlinfos['query'];
 $sessionQuery = "GET $gquery HTTP/1.1rn";
 $sessionQuery .= "主機: $ghostrn";
 $sessionQuery .= "接受: */*rn";
 $sessionQuery .= "用戶代理: Mozilla/4.0 (兼容; MSIE 5.00; Windows 98)rn";
 $sessionQuery .= "連接: Closernrn";
 $errno = "";
 $errstr = "";
 $m_fp = fsockopen($ghost, 80, $errno, $errstr,10) 或die($ghost.'');
 fwrite($m_fp,$sessionQuery);
 $lnum = 0;

 //取得詳細的應答頭
 $gcookie = "";
 while(!feof($m_fp ))
 {
 $line = trim(fgets($m_fp,256));
 if($line == "" || $lnum>100)
 {
 中斷;
 }
 else
 {
 if(preg_match("/^cookie/i", $line))
 {
 $gcookie = $line;
 休息；
 }
 }
 }
 fclose($m_fp);
 回傳$gcookie;
}

/**
 * 取得某頁回傳的Cookie資訊
 *
 * @access public
 * @param string $gurl 調整位址
 * @return string
*/
 ($gurl)
{
 $gurl = preg_replace("/^http:///i", "", 修剪($gurl));
 $garr['host'] = preg_replace( "//(.*)$/i", "", $gurl);
 $garr['query'] = "/".preg_replace("/^([^/]*)//i" , "", $gurl);
 回傳$garr;
}
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