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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/
    This filter allows query vars to be added, removed, or changed prior to executing the query. Example # Example function themeslug_query_vars( $qvars ) { $qvars[] ='custom_query_var'; return $qvars; } add_filter( 'query_vars', 'themeslug_query_vars' );

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!

get_query_var() Function WordPress Developer Resources

    https://developer.wordpress.org/reference/functions/get_query_var/
    33 rows · function themeslug_query_vars( $qvars ) { $qvars[] ='custom_query_var'; return …

View all WP query variables WP-Mix

    https://wp-mix.com/wp-query-variables/
    Dec 22, 2016 · Micro Tip for the day: slice of PHP code for viewing all WordPress query variables. Very useful for figuring out custom loops and such. Just add this in any theme template file, for example just before the WordPress Loop: global $wp_query ; var_dump ( $wp_query ->query_vars); Check out View all WP Post variables to learn more.

WP_Query Class WordPress Developer Resources

    https://developer.wordpress.org/reference/classes/wp_query/
    $query = new WP_Query( array( 'category_name' => 'staff,news' ) ); Display posts that have “all” of these categories: $query = new WP_Query( array( 'category_name' => 'staff+news' ) ); Display all posts except those from a category by prefixing its id with a ‘-‘ (minus) sign. $query = new WP_Query( array( 'cat' => '-12,-34,-56' ) );

plugin development - Using query_vars filter - WordPress ...

    https://wordpress.stackexchange.com/questions/107555/using-query-vars-filter
    function my_query_vars($query_vars){ $query_vars[] ='my-preview'; return $query_vars; } On the actual section where I need to get that value, I tried using: global $wp_query; var_dump($wp_query->query_vars); Even with a url like the example above, the 'my-preview' pair is nowhere to be found in the $wp_query->query_vars array.

add_query_arg() Function WordPress Developer Resources

    https://developer.wordpress.org/reference/functions/add_query_arg/
    149 rows · Using a single key and value: add_query_arg ( 'key', 'value', 'http://example.com' ); …

WP_User_Query Class WordPress Developer Resources

    https://developer.wordpress.org/reference/classes/wp_user_query/
    $qv =& $this->query_vars; $qv = $this->fill_query_vars( $qv ); if ( is_array( $qv['fields'] ) ) { $qv['fields'] = array_unique( $qv['fields'] ); $this->query_fields = array(); foreach ( $qv['fields'] as $field ) { $field ='ID' === $field ?

php - How to pass extra variables in URL with WordPress ...

    https://stackoverflow.com/questions/4586835/how-to-pass-extra-variables-in-url-with-wordpress
    the query_vars filter - to modify the list of public query variables that WordPress knows about (this only works on the front-end, because the WP Query is not used on the back end - wp-admin - so this will also not be available in admin-ajax) get_query_var () - to retrieve the value of your custom query variable passed in your URL.
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