Automated redirect for old post/thread links

[Richard]

Originally Posted by Ballbarian

Great!

All appear to be working now with one exception:
http://www.shrapnelcommunity.com/thr...&Number=528292

That old thread link was working with some of your changes (earlier), but now goes to the 404 page.

Okay this one may be able to be fixed but I am not sure. The problem is most incoming links have an & after the post number and the redirect is looking for that. These types of url's don't have an & at the end so it's confused . Let me think on that one...

[lch]

Richard, thanks for looking into this. I'd recommend that you create substitutes for the old showflat.php, shownested.php etc. scripts instead of abusing 404 error pages for this.

I'll drop some PHP code here which I have been using for some projects myself. First, a replacement for PHP's parse_url function:

PHP Code:

// returns an array with the following elements defined in it:
//   scheme://username:password@host:port/path?query#fragment
// this function is more robust than parse_url

function parseUrl($url) {
  $r  = '!(?:(?<scheme>\w+)://)?(?:(?<username>\w+)\:(?<password>\w+)@)?(?<host>[^/:]+)?';
  $r .= '(?:\:(?<port>\d*))?(?<path>[^#?]+)?(?:\?(?<query>[^#]+))?(?:#(?<fragment>.+$))?!i';
  preg_match($r, $url, $out);
#  for ($i = 0; $i < 9; ++$i)
#    unset($out[$i]);
  return $out;
} 


then one which does the reverse:

PHP Code:

// inverse function to parseUrl

function glueUrl($parsed)
{
  if (!is_array($parsed)) return false;
  $uri = strlen($parsed['scheme']) ? $parsed['scheme'].':'.((strtolower($parsed['scheme']) == 'mailto') ? '' : '//') : '';
  $uri .= strlen($parsed['user']) ? $parsed['user'].(strlen($parsed['pass']) ? ':'.$parsed['pass'] : '').'@' : '';
  $uri .= strlen($parsed['host']) ? $parsed['host'] : '';
  $uri .= strlen($parsed['port']) ? ':'.$parsed['port'] : '';
  if (strlen($parsed['path'])) {
    $uri .= ($parsed['path'][0] == '/') ? $parsed['path'] : ('/'.$parsed['path']);
  }
  $uri .= strlen($parsed['query']) ? '?'.$parsed['query'] : '';
  $uri .= strlen($parsed['fragment']) ? '#'.$parsed['fragment'] : '';
  return $uri;
} 


and finally something which uses both to merge a given URL with a query string, which shows how they can be used:

PHP Code:

// merges given URL with the specified query string

function MergeQueryStrings($url, $query) {
  $parsed = parseUrl($url);
  parse_str($query, $addq);
  parse_str($parsed['query'], $oldq);
  $newq = array_merge($oldq, $addq);
  $parsed['query'] = http_build_query($newq);
  return glueUrl($parsed);
} 


Maybe it's some help. What you really should make use of is the parse_str function.