WordPress page shows 404 when adding URL

Question

I am adding a rewrite rule to a PHP script included in a WordPress page with the permalink kb

So I can access domain.com/kb and display the page.

function wdm_add_rewrite_rules() {
    add_rewrite_rule( '^kb/([^/]+)/?$', 'kb?kb_cat=$matches[1]&kb_seq=1', 'top');
}
add_action('init', 'wdm_add_rewrite_rules');

But when I visit a page that contains other strings in the URL, I get a 404.

So when I visit domain.com/kb it shows the correct page, then when I visit domain.com/kb/84/92 it shows 404

I just need to be able to read the additional url parameters in the PHP script, like $_GET["kb_cat"]

Answer 1

Try this:

function wdm_add_rewrite_rules() {
    add_rewrite_rule( '^kb\/([^\/]+)\/?([^\/]+)$', 'kb?kb_cat=$matches[1]&kb_seq=1', 'top');
}
add_action('init', 'wdm_add_rewrite_rules');

You can check the regular expression at https://regex101.com/ or any other similar online website for the contest

Answer 2

function wdm_add_rewrite_rules() {
    add_rewrite_rule( '^kb$', 'index.php?kb_cat=$matches[1]&kb_seq=1', 'top');
}
add_action('init', 'wdm_add_rewrite_rules');

Go one step further and use parameters:

function add_query_vars_filter( $vars ){
    $vars[] = "kb_cat";
    $vars[] = "kb_seq";
    return $vars;
}
add_filter( 'query_vars', 'add_query_vars_filter' );

Then load the custom template file:

function include_custom_template($template){

    if(get_query_var('kb_cat') && get_query_var('kb_seq')){
        $template = get_template_directory() ."/my-custom-template.php";
    } 
   
    return $template;    
}

add_filter('template_include', 'include_custom_template');

Once added to functions.php, go to Settings > Permalinks and click Save Changes to reset refresh rules