Trying to create a SEO plugin, that will remove stop words from slugs.

This is how to explode the $slug into a list, and explode the variable containing the stop words :

add_filter ('sanitize title', 'remove_false_words');
function remove_false_words($slug) {
    if (!is_Admin()) return $slug;

    $slug = explode ('-', $slug);

    foreach ($slug as $key => $word) {
        //The $slug has been exploded and retrieves its value

        $keys_false = 'a,above,the,also';
        $keys = explode (',', $keys_false);

        foreach ($keys as $1 => $wordfalse) {
            if ($word == $wordfalse) {
                unset ($slug[$k]);
    return implode ('-', $slug);

Is it correct to unset the value here? Or should I use a different way of achieving the same result?

  • $keys_false is a string right now. Is that right? Should be array I think – GhostToast Jun 6 '13 at 13:45
  • @GhostToast : mattnewbie explodes the string on the next line-- unnecessary step but it isn't broken. – s_ha_dum Jun 6 '13 at 13:47
  • Oh yes. I forget about explode() as I only ever find my self using it's evil twin, implode() – GhostToast Jun 6 '13 at 13:48

There should be no problem with unset. There is your answer. What matters with a filter is what you return and unseting those keys before your rebuild the string and return it, works.

You are doing too much processing by explodeing your $keys_false inside a loop, and you have a typo, and you are better off just making an array instead of creating a string that you convert to an array, and PHP has a function to do what your loop is doing. I reorganized it for you.

function remove_false_words($slug) {
  if (!is_admin()) return $slug;
  $keys_false = array('a','and','above','the','also');
  $slug = explode ('-', $slug);
  $slug = array_diff($slug,$keys_false);
  return implode ('-', $slug);
var_dump(remove_false_words('a-boy-and-his-dog')); // proof of concept
| improve this answer | |
  • Thank-you. I have been looking as some wordpress snippets that I found on the internet, make need to re-think how I study. As this was one of the snippets I found, & obviously isn't very good. – mattnewbie Jun 6 '13 at 14:41
  • PHP suffers from being a "copy and paste and hack together without knowing what you are doing" language. There is a lot of a bad stuff out there. – s_ha_dum Jun 6 '13 at 14:43

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