将帖子分配给特定类别等同于将其分配给所有类别

Allow me to explain with an example, for the sake of clarity. Please take the time to read it all to get a good idea of what I am exactly after.

On my WordPress site categories are used as Editions and there are 4 of them — Category (slug):

US (main)
UK (uk)
India (in)
International (intl)

The permalink structure is /%category%/%year%/%monthnum%/%day%/%postname%/. With this permalink structure in place, a post assigned to more than 1 category will be accessible via any of the category slugs in the permalink.

For example, if a post is assigned to US and UK categories, it\'ll be accessible via both of these URLs (no redirection):

http://example.com/main/2013/11/01/sample-post/
http://example.com/uk/2013/11/01/sample-post/

Points of note:

The permalink will still only include the slug of the category with the lowest ID.
If you try using the slug of a category that the post is not assigned to, it\'ll redirect back to the permalink. For instance, these two (note intl and in):
```
http://example.com/intl/2013/11/01/sample-post/
http://example.com/in/2013/11/01/sample-post/
```
Will redirect back to the permalink, i.e.
```
http://example.com/main/2013/11/01/sample-post/
```

The problem: For those posts that I want to be shown in all Editions (categories in my case), I can check all categories when publishing the post. But that\'d cause problems later on when I add more editions, i.e. the old posts won\'t be shown under the new Editions/categories.

So I use this custom function to suit my needs:

add_filter(\'pre_get_posts\',\'better_editions_archive\');
function better_editions_archive( $query ) {
    if ( $query->is_tax( \'category\' ) && $query->is_main_query() ) {
        $query->set( \'post_type\', array( \'post\' ) );
        $query->set( \'tax_query\',
            array(
                \'relation\' => \'OR\',
                array(
                    \'taxonomy\' => \'category\',
                    \'field\' => \'slug\',
                    \'terms\' => \'intl\',
                    \'operator\' => \'IN\'
                )
            )
        );
    }
    return $query;
}

/*
 * Based on:
 * http://wordpress.stackexchange.com/a/90573/10691
 */

With that function in place, when I want a post to be displayed in all Editions (categories), I can simply assign the post to International (intl) category and voila!

The problem is, now the post is only accessible via its permalink i.e. http://example.com/intl/2013/11/01/sample-post/.

But I want it to be accessible (with no redirection) via all the category slugs, i.e.

http://example.com/main/2013/11/01/sample-post/
http://example.com/uk/2013/11/01/sample-post/
http://example.com/in/2013/11/01/sample-post/

Reason: In each Edition (category) archive, I want all the posts\' links to start with that specific category\'s slug i.e. if the archive URL is http://example.com/uk/, I made sure that all post URLs\'d look like this:

http://example.com/uk/2013/11/01/sample-post-1/
http://example.com/uk/2013/11/01/sample-post-2/
http://example.com/uk/2013/11/01/sample-post-3/

I used str_replace() for this, just so it\'s clear.

Now, the question is, when a post is assigned to International (intl) category, how can I make sure that it\'s accessible, without any redirection whatsoever, via all category slugs, as if the post were assigned to all the categories?

Precisely, how do I make assigning a post to a specific category equivalent to assigning it to all categories?

/* * Related core file: wp-includes/canonical.php * * NOTE: If you see no change after adding the function, try re-saving the permalink settings. */ add_filter( \'redirect_canonical\', \'itsme_redirect_canonical\', 10, 2 ); function itsme_redirect_canonical( $redirect_url, $requested_url ) { global $wp_rewrite; if( is_single() && in_category( \'intl\' ) && strpos( $wp_rewrite->permalink_structure, \'%category%\' ) !== false && $cat = get_query_var( \'category_name\' ) ) { $category = get_category_by_path( $cat ); if( $category && !is_wp_error( $category ) ) { return str_replace( \'intl\', $cat, $redirect_url ); // return $requested_url; /* * WHY NOT SIMPLY `return $requested_url;`? * * By returning $requested_url you\'re returning something that might not be * canonical (e.g. extra slashes, etc) and there\'s a possibility that the * safety rules that WordPress has in place will redirect your URL back to * the (original) canonical URL. * * For example, this will work fine: * * http://example.com/in/2013/11/02/sample-post/ * * But this: * * http://example.com/in/2013/11/02/sample-post///// * * Will redirect back to the original, canonical URL, i.e., * * http://example.com/intl/2013/11/02/sample-post/ * * In order to avoid that, you\'ll additionally have to write some safety * rules so that a *corrected* URL, rather than simply the requested one, is * returned, in which case, you may need to use `str_replace` or `preg_replace` * to remove the extra characters, among other rules needed, if any. Now that * can get complex. * * So instead of dealing with all this mess ourselves, we are allowing * WordPress to redirect to the (original) canonical URL, and at that point, * we are replacing \'intl\' (which is the category slug in the canonical URL) * with the category slug in the requested URL. */ } } return $redirect_url; }

add_action( \'save_post\', \'assign_edition_terms\' ); function assign_edition_terms( $post_id ) { if ( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE ) return; if ( ! current_user_can( \'edit_post\', $post_id ) ) return; // Could also check on post type here. if ( ! filter_has_var( INPUT_POST, \'assign_international\' ) ) return; // Get all international terms $editions = get_terms( \'edition_taxonomy\', array( \'parent\' => 0, // only return parent terms \'hide_empty\' => false // get also terms that have no content yet. ) ); $edition_ids = array(); foreach ( $editions as $edition ) { $edition_ids[] = $edition->term_id; } // Assign all the terms wp_set_post_terms( $post_id, $edition_ids, \'edition_taxonomy\' ); // You may require a rewrite flush here. }

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