Remove Stop Words from URL

Remove Stop Words from URL

/**
* Remove Stop Words from URL By http://goo.gl/ht6fZo//
*/
add_filter('sanitize_title', 'remove_stop_words');

function remove_stop_words($slug) {    

if (!is_admin()) return $slug;    

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

foreach ($slug as $k => $word) {
        // List of stop words comma separated
	$keys_false = 'a,the,him,her,how';		
        $keys = explode(',', $keys_false);		

        foreach ($keys as $l => $wordfalse) {			
              if ($word==$wordfalse) {				
                    unset($slug[$k]);			
              }		
        }    
}    

return implode('-', $slug);}