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WordPress Query Vars « WordPress Codex

    https://codex.wordpress.org/WordPress_Query_Vars
    Query vars define a query for WordPress posts. When ugly permalinks are enabled, query variables can be seen in the URL. For example, in the URL http://example.com/?p=1 the p query var is set to 1, which will display the single post with an ID of 1. When pretty permalinks are enabled, URLs don't include query variables.

query_vars Hook WordPress Developer Resources

    https://developer.wordpress.org/reference/hooks/query_vars/
    Description # Description. Allows (publicly allowed) query vars to be added, removed, or changed prior to executing the query. Needed to allow custom rewrite rules using your own arguments to work, or any other custom query variables you want to be publicly available.

get_query_var() Function WordPress Developer Resources

    https://developer.wordpress.org/reference/functions/get_query_var/
    get_query_var () only retrieves public query variables that are recognized by WP_Query. This means that if you create your own custom URLs with their own query variables, get_query_var () will not retrieve them without some further work (see below). Custom Query Vars #

View all WP query variables WP-Mix

    https://wp-mix.com/wp-query-variables/
    Dec 22, 2016 · About the Site. WP-Mix is where I share code snippets, tricks, and tips. WP-Mix was launched in October 2012, and now features 391 posts. You can check out the latest post published on Jan 25, 2021. Learn more ›

Plugin API/Filter Reference/query vars « WordPress Codex

    https://codex.wordpress.org/Plugin_API/Filter_Reference/query_vars
    Interested in functions, hooks, classes, or methods? Check out the new WordPress Code Reference!

Function Reference/get query var « WordPress Codex

    https://codex.wordpress.org/Function_Reference/get_query_var
    Check out the new WordPress Code Reference! Function Reference/get query var Languages : English • Italiano • query var 日本語 ( Add your language )

add_query_arg() Function WordPress Developer Resources

    https://developer.wordpress.org/reference/functions/add_query_arg/
    function add_query_arg( ...$args ) { if ( is_array( $args[0] ) ) { if ( count( $args ) < 2 false === $args[1] ) { $uri = $_SERVER['REQUEST_URI']; } else { $uri = $args[1]; } } else { if ( count( $args ) < 3 false === $args[2] ) { $uri = $_SERVER['REQUEST_URI']; } else { $uri = $args[2]; } } $frag = strstr( $uri, '#' ); if ( $frag ) { $uri = substr( $uri, 0, -strlen( $frag ) ); } else { $frag = ''; } …

WP_Query Class WordPress Developer Resources

    https://developer.wordpress.org/reference/classes/wp_query/
    You don’t have to specify a value when using the 'EXISTS' or 'NOT EXISTS' comparisons in WordPress 3.9 and up. (Note: Due to bug #23268, value is required for NOT EXISTS comparisons to work correctly prior to 3.9. You must supply some string for the value parameter. An empty string or NULL will NOT work.

Date-based archives for custom post_types (wordpress 3.0 ...

    https://stackoverflow.com/questions/3137372/date-based-archives-for-custom-post-types-wordpress-3-0
    3) At the top of my page template, I check for the custom query vars and build the page accordingly. (I should have been able to use the built-in year and monthnum, but couldn't get them to work properly.
    [CATITEMSBL#1]

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