- // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
- if (empty($_SERVER['HTTP_REFERER'])) {
- header('Location: ?');
- exit;
- }
-
- // In case browser does not send HTTP_REFERER
- parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
-
- // Prevent redirection loop
- if (isset($params['removetag'])) {
- unset($params['removetag']);
- }
-
- if (isset($params['searchtags'])) {
- $tags = explode(' ', $params['searchtags']);
- // Remove value from array $tags.
- $tags = array_diff($tags, array($_GET['removetag']));
- $params['searchtags'] = implode(' ', $tags);
-
- if (empty($params['searchtags'])) {
- unset($params['searchtags']);
- }
-
- // We also remove page (keeping the same page has no sense, since
- // the results are different)
- unset($params['page']);
- }
- header('Location: ?'.http_build_query($params));