WordPress SEO: Automatically remove short words from the URL

Paste the code below into your functions.php file. Once you saved the file, WordPress will automatically remove short (less than 3 characters) words from the generated permalink.

add_filter('sanitize_title', 'remove_short_words');
function remove_short_words($slug) {
    if (!is_admin()) return $slug;
    $slug = explode('-', $slug);
    foreach ($slug as $k => $word) {
        if (strlen($word) < 3) {
            unset($slug[$k]);
        }
    }
    return implode('-', $slug);
}

Thanks to Kevin Chard for this awesome piece of code!