Anonymous

function url_exists($url) { 
       $a_url = parse_url($url); 
       if (!isset($a_url['port'])) $a_url['port'] = 80; 
       $errno = 0; 
       $errstr = ''; 
       $timeout = 30; 
       if(isset($a_url['host']) && $a_url['host']!=gethostbyname($a_url['host'])){ 
           $fid = fsockopen($a_url['host'], $a_url['port'], $errno, $errstr, $timeout); 
           if (!$fid) return false; 
           $page = isset($a_url['path'])  ?$a_url['path']:''; 
           $page .= isset($a_url['query'])?'?'.$a_url['query']:''; 
           fputs($fid, 'HEAD '.$page.' HTTP/1.0'."\r\n".'Host: '.$a_url['host']."\r\n\r\n"); 
           $head = fread($fid, 4096); 
           fclose($fid); 
           return preg_match('#^HTTP/.*\s+[200|302]+\s#i', $head); 
       } else { 
           return false; 
       } 
   }