<?php
function httpFileSize($file)
{
   ereg("http:\/\/([^\/]*)\/(.*)", $file, $reg);
   
   $uri = '/' . $reg[2];
   
   if(strstr($reg[1], ':') !== false)
   {
       list($host, $port) = explode(':', $reg[1]);
   }
   else
   {
       $host = $reg[1];
       $port = 80;
   }
   
   $get = 'GET ' . $uri . ' HTTP/1.1' . "\r\n" . 'Host: ' . $host . "\r\n\r\n";
   
   $sock = fsockopen($host, $port);
   fwrite($sock, $get, strlen($get));
   $res = fread($sock, 1024);
   fclose($sock);
   
   if(eregi("Content-Length: ([0-9]*)", $res, $reg)) 
   {
       return $reg[1];
   }
   else
   {
       $i = 0;
       
       $fp = fopen($file, 'r');
       while(!feof($fp))
       {
           $i += strlen(fread($fp, 4096));
       }
       fclose($fp);
       
       return $i;
   }
}
?>