Allowing periods in wordpress permalinks

atom — Mon, 04 Jan 2010 04:36:06 +0000

Trying to get periods in Wordpress permalinks to work, but failing. How can I force WP to allow: http://example.com/foo.bar/

I was curious so I watched replies to him. There were many deeply misguided answers, my favorite being:

I’m not sure, but it seems like it might likely be a server configuration issue.

There was a reference to this: http://firsttube.com/read/hacking-wordpress-day-two/, but hacking the core is a pretty poor solution, and will be overwritten the next time you upgrade.

The periods get dropped by sanitize_title_with_dashes, and there is no clean way to hook into it and fix the problem, so you can just use remove_filter to drop it, and replace it with a very similar function that allows for periods:

remove_filter('sanitize_title', 'sanitize_title_with_dashes');
add_filter('sanitize_title', 'sanitize_title_with_dashes_allow_periods');
 
function sanitize_title_with_dashes_allow_periods($title){
        // same as sanitize_title_with_dashes minus the line replacing periods, 
        // and an alteration to the final catch all regex to allow periods
        // please note, might be dangerous for some reason?  i don't rightly know.
        $title = strip_tags($title);
        // Preserve escaped octets.
        $title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);
        // Remove percent signs that are not part of an octet.
        $title = str_replace('%', '', $title);
        // Restore octets.
        $title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);
 
        $title = remove_accents($title);
        if (seems_utf8($title)) {
                if (function_exists('mb_strtolower')) {
                        $title = mb_strtolower($title, 'UTF-8');
                }
                $title = utf8_uri_encode($title, 200);
        }
 
        $title = strtolower($title);
        $title = preg_replace('/&.+?;/', '', $title); // kill entities
        //$title = str_replace('.', '-', $title);
        $title = preg_replace('/[^\.%a-z0-9 _-]/', '', $title); // allow for periods
        $title = preg_replace('/\s+/', '-', $title);
        $title = preg_replace('|-+|', '-', $title);
        $title = trim($title, '-');
 
        return $title;
}

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Allowing periods in wordpress permalinks

Please note that this could be dangerous, they might be removing periods for a good reason