Update URL Snippet to Canonical Permalink URL

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My permalinks is in the format domain.com/post-id/post-slug

I notice this is a great choice for permalinks as I can share articles with a short URL like domain.com/123

But when I go to this short url, should it not redirect to show the full URL, becuase in the adress bar its only showing domain.com/123

Any setting to do to update the URL to the actual, without putting any additional load or the server.

UPDATE: My requirement is not to get a shortlink. Rather to convert an URL fragment to the full URL.

For eg: If I type domain.com/123/wrong-slug it gets corrected to domain.com/123/correct-slug
but if I type domain.com/123 it doesn’t get corrected to domain.com/123/post-slug

4 Answers
4

Why?

I think the reason why 

a) domain.com/123

is not redirected back to

b) domain.com/123/post-slug

with the /%post_id%/%postname%/ permalinks settings, is that the matched rule is:

[matched_rule] => ([0-9]+)(/[0-9]+)?/?$

You can get that information from the global $wp object.

There are other useful informations in $wpavailable after the wp action:

Example (post): domain.com/123/post-slug/

[query_vars] => Array
    (
        [p] => 123
        [page] => 
        [name] => post-slug
    )

[query_string] => p=123&name=post-slug
[request] => 123/post-slug
[matched_rule] => ([0-9]+)/([^/]+)(/[0-9]+)?/?$
[matched_query] => p=123&name=post-slug&page=
[did_permalink] => 1

Example (post): domain.com/123/:

[query_vars] => Array
    (
        [p] => 123
        [page] => 
    )
[query_string] => p=123
[request] => 123
[matched_rule] => ([0-9]+)(/[0-9]+)?/?$
[matched_query] => p=123&page=
[did_permalink] => 1

Example (page): domain.com/hello-world/:

[query_vars] => Array
    (
        [page] => 
        [pagename] => hello-world
    )

[query_string] => pagename=hello-world
[request] => hello-world
[matched_rule] => (.?.+?)(/[0-9]+)?/?$
[matched_query] => pagename=hello-world&page=
[did_permalink] => 1

Redirect example:

Here’s an example how to redirect from a) to b) using information from the global $wp object:

add_action( 'wp', function(){
    global $wp;
    if( is_numeric( $wp->request ) && empty( $wp->query_vars['page'] ) )
    {
        wp_redirect( get_permalink( absint( $wp->request ) ), 301 );
        exit();
    }
});

i.e. we redirect when the page query varaible is not set and the request is numeric.

ps: I just want to mention that this is using the wp action, that is fired rather late, but before the template_redirect action, allowing the redirect possible.

I also tried to come up with an example that is not using the $_SERVER variable 😉

Hope this helps.

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