query-variable - Read For Learn

How can I use an alternate header when a query var is present

ChatGPT provided a working solution: function load_custom_header_for_campaign( $template ) { // Check if the ‘campaign’ query var is set if (isset($_GET[‘campaign’])) { // Load the header-lp.php file instead of the default header add_filter(‘get_header’, function($header) { return ‘lp’; // This will load header-lp.php }); } return $template; } add_filter(‘template_include’, ‘load_custom_header_for_campaign’); It notes: The issue you’re encountering … Read more

How does WordPress manage to differentiate between post and page URLs without a distinct base, and how can I replicate this functionality?

I dont know how I missed out on that while looking for aproaches, but I have a working solution now based on this answer. I modified it to check for slashes in $query->request, if there is none I first look for my custom post type (get_posts() with’slug’ => $query->request). If no post is found I … Read more

Unable to Retrieve Query Parameters Passed in URL

There’s been a misunderstanding of what query vars actually are and what they’re used for. The correct way to read a URL parameter is the same way as every other PHP application: $mc_id = $_GET[‘mc_cid’]; This is because query vars are not URL parameters! WordPress doesn’t have a special way to retrieve URL parameters, it … Read more

`query_var` values empty in theme file after `add_rewrite_rule` redirection

Changing the add_rewrite_rule did the trick: add_rewrite_rule(‘^periodicals/([^/]+)-‘.$tlv[‘code’].'[/]?$’, ‘index.php?periodicals=$matches[1]&post_type=periodicals&name=$matches[1]&mlang=’.$tlv[‘code’], ‘top’); So, I assume for custom post types, using add_rewrite_rule with index.php as query need some extra query variables. A sample will be as: add_rewrite_rule(‘^<custom_post_type>/([^/]+)-‘.$tlv[‘code’].'[/]?$’, ‘index.php?<custom_post_type>=$matches[1]&post_type=<custom_post_type>&name=$matches[1]&mlang=’.$tlv[‘code’], ‘top’);

Why does $_GET return values but get_query_var does not?

Because they do different things and source their data from different places. $_GET is for URL parameters, values passed via HTTP GET. get_query_var is for fetching the query variables of the main post query aka the WP_Query object. Query variables and GET values are not the same thing. Query variables usually get their values either … Read more

Send a variable with a URL and get a variable with Wp query

Make sure that the page template is applied to the correct page and you are accessing the correct URL and then go to the Settings > Permalink and save permalinks one or two times. That should clear the older rewrite rules and make the new page template work instead of sending you to the 404 … Read more

query_vars doesn’t return query string (trying to get data from $wpdb)

I think the issue may be that you think query_vars can pick up the query string arguments from a URL, but you don’t need to do it that way. That’s primarily used if you’re needing to get this into the WP Query (which isn’t what you’re doing here). It’s much easier to simply check for … Read more

Need help with regex

It’s not understandable for me, but the second definition works now. No idea, why it didn’t work before, but I guess, somewhere I made a small mistake. Sorry, for my useless post 😉

Add additional URL variations for a Post

$_GET vs get_query_var()

get_query_var() gets variables from the main instance of WP_Query. It’s the equivalent of running global $wp_query; $wp_query->get( ‘posts_per_page’ ); It is not directly related to $_GET in any way. However, WordPress has a list of ‘public’ query variables that will be applied to the main query if they are passed as URL parameters. This is … Read more

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