"Paul Van Schayck" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > [EMAIL PROTECTED] (Kevin Stone) wrote > Hello Kevin. > > > This is just a thought.. I have never employed this method > > personally.. but I suppose you could read the page into a string and > > use the md5() function to generate a hexidecimal value based on that > > string. Store the hex value in a database and compare it against the > > new value generated the next day. If anything on the page has been > > modified the values should not match. Even the most minute change > > should trigger a new value. Obviously you won't know *what* has been > > modified only that the page *has* been modified > > > > There are some pitfalls to keep in mind such as if the page contains > > dynamic content, if there is a server error, or if the page has been > > removed. Thanks to Network Solutions evil Sitefinder you may find it > > difficult if not impossible to predict what will be read by your > > script if the page goes missing. But this will all show up in the hex > > value and you won't know if the page is still relevant until you > > personally visit the links. > > Too much pittfals and too slow! Really the socket connection only > retreiving the headers is really the best way. > > This function is what you need: > > function fileStamp($domain, $file) > { > $file = "/" . $file; > $fp = fsockopen ($domain, 80, $errno, $errstr, 30); > $header = "HEAD $file HTTP/1.0\r\nHost: $domain\r\n\r\n"; > if (!$fp){ > echo "$errstr ($errno)"; > return false; > } > fputs ($fp, $header); > while (!feof($fp)) { > $output .= fgets ($fp,128); > } > fclose ($fp); > $begin = strpos($output, "Last-Modified: ") + 15; > if($begin==15) //no last-modified (like yahoo.com) > return false; > $end = strpos($output, "\n", $begin); > $time = substr($output, $begin, $end-$begin-1); > return strtotime($time); > } > > Polleke
Slow? Hogwash. You're pining over microseconds. Besides most of the time is taken opening the file which you're doing anyway. Except that the socket method relies on header information that may or may not be there. I agree it would be ideal if you could use that information but your fileStamp() function isn't going to work for all files on all servers. - Kevin
