How to add a slash at the end of category's url and remove it at the end of post's on wordpress?

Question

How to make wordpress category's URL with slash at the end and without it in post's url. Like this:

"mysite.com/mycategory/" "mysite.com/mycategory/mypost"

The problem is that by default, you can either do everything with a slash or all without a slash. ('category' prefix already removed via htaccess).

Answer 1

There are two good solutions for this:

The WP_Rewrite class has a var named $use_trailing_slashes that is set dynamically based upon whether or not your custom permalink structure ends in a '/'.

$this->use_trailing_slashes = ( '/' == substr($this->permalink_structure, -1, 1) );

This means that all WP generated links (the_permalink, category_link, the_permalink_rss, etc.) will not end in a '/'. So for category pages WP will show '/category/category' instead of '/category/category/'.

You can solve it by either using a filter or modifying your .htaccess or both:

Sample user_trailingslashit Filter

The user_trailingslashit function applies the 'user_trailingslashit' filter to the result prior to returning it. It provides the url and the type of url to the filter.

$string = apply_filters('user_trailingslashit', $string, $type_of_url);

So to hook into this and add a trailing slash to all urls other than single posts add this code to a plugin file or your functions.php theme file.

function fix_trailingsss($s='',$t='single')
{
  if($t!='single')$s=rtrim($s,'/').'/';
  return preg_replace('/^(.*)([^l/])$/i', '\1\2/',$s);
}
add_filter('user_trailingslashit', 'fix_trailingsss', 9999,2);

Htaccess RedirectMatch

You can setup an .htaccess redirect to force category urls to always use a trailing slash like this:

RedirectMatch 301 ^/category/([^/]+)$ /category/$1/

Source of information: https://www.askapache.com/wordpress/adding-trailing-permalinks/

For any further questions consult the codex:

https://codex.wordpress.org/wp_rewrite

https://codex.wordpress.org/Using_Permalinks

Answer 2

I solved it like this:

function no_page_slash( $string, $type ){
    if($type == 'single')
        $string = untrailingslashit($string);
   return $string;
}
add_filter('user_trailingslashit', 'no_page_slash', 70, 2);

Your permalinks must be set on like /%category%/%postname%/ .