Change cannonical URL after changing url with add_rewrite_rule()

Question

Change cannonical URL after changing url with add_rewrite_rule()

Miguel Vieira

2020年9月24日 18:21

So, I'm making a plugin for some niche application for my customer which involves a table with data, and I created a page within the plugin to show more in-depth information about the table row.

This is how I'm making the rewrite:

function mytableplugin_page_rewrite(){
 $page_slug = 'mytablepluginpage';

 // urls will be in the form
 // /your-page/42/

 add_rewrite_rule(
     'mytableplugin/([0-9a-zA-Z_-]+)/?$',
     'index.php?pagename=' . $page_slug . 'tid=$matches[1]',
     'top'
 );
}

But the redirect doesn't affect the canonical URL, so every mytableplugin page has the same mytablepluginpage canonical URL

I'm not using Yoast SEO plugin, and I don't want my plugin to depend on it, so, how can I change the canonical link of the page? I want the custom name (mytableplugin != mytablepluginpage) to be kept and the argument to keep on the canonical URL

It's being a problem because the TranslatePress plugin is using the wrong URL when switching languages, it's throwing me back into the mytablepluginpage page that has no content without the queries.

Edit: I tried some more stuff, and hijacking the rel_canonical function does work to change the canonical URL, but doesn't solve the problem of the translatepress plugin having the wrong URL for the language switching, here's the code I used:

remove_action('wp_head', 'rel_canonical');
add_action('wp_head', 'my_rel_canonical');

function my_rel_canonical() {
    if (is_page('mytablepluginpage')) {
        
        global $wp;
        echo link rel='canonical' href='.home_url( $wp-request ).'/\n;
        
    } else {
        rel_canonical();
    }
}

(This last code came from this StackOverflow question)

Thanks in advance!

Topic rel-canonical url-rewriting plugin-development Wordpress

Category Web

Miguel Vieira · Accepted Answer · 2020年9月24日 18:21

Okay, I found a way to do it, if someone ever need to create a permalink or change a permalink for a virtual page or a dynamic page, here's how:

The get_permalink(), the_permalink() and get_the_permalink() functions may be filtered by using the post_type_link, page_link and/or post_link filters, each one of these is for one kind of post.

This is the function I ended up with:

function mytableplugin_rename_permalink($url, $post) {
    
    $table = get_page_by_path('mytablepluginpage');
    global $wp;
    
    if ( 'integer' === gettype( $post ) ) {
        $post_id = $post;
    } else {
        $post_id = $post->ID;
    }

    
    // check if we are targetting the plugin page
    if (  $table->ID == $post_id ) {
        $url = home_url( $wp->request );
    }
    
    apply_filters( 'mytableplugin', home_url( $wp->request ), get_the_ID(), false );

    // Return the value of the URL
    return $url;
}

add_filter( 'post_type_link', 'mytableplugin_rename_permalink', 10, 2 );
add_filter( 'page_link', 'mytableplugin_rename_permalink', 10, 2 );
add_filter( 'post_link', 'mytableplugin_rename_permalink', 10, 2 );

I didn't have to add all the three filters, but I did as to avoid any problems if I ever change the post type of the page in the plugin.

I got the code for making it work from this page and this question

It fixed the canonical URL, the permalink and the translatePress problems.

Change cannonical URL after changing url with add_rewrite_rule()

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