Read what is query vars in wordpress for more information.

When pretty permalinks are enabled, URLs don't include query variables. Instead
, WordPress transforms the URL into query vars via the Rewrite API, which are …
WordPress is wonderful. I think we can all agree it's not only an awesome
blogging platform, but an immensely powerful open-source CMS.
what is query vars in wordpress
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 …
The Rewrite API for WordPress is an important feature that you probably don't
read much about, but you're no doubt using without even …
I'm almost sure that author is built-in, so use something like author_more . You
will need to add that var to query_vars first. Example:
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 …
… public query variables available to WP_Query. These are built up when
WP_Query instantiates, but fortunately are passed …
If you haven't watched the Template Files tutorial, that will be essential to make
use of this lesson. So start here…
Set query variable. … set_query_var( string $var, mixed $value ). Set query
variable. … $value. (mixed) (Required) Query variable value.
An example plugin showing how to add custom query vars, rewrite tags and
rewrite rules to WordPress – custom-queries.php.

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