WP::add_query_var() – Method | Developer.WordPress.org

WP::add_query_var( string $qv )

Adds a query variable to the list of public query variables.

Parameters

public function add_query_var( $qv ) {
	if ( ! in_array( $qv, $this->public_query_vars, true ) ) {
		$this->public_query_vars[] = $qv;
	}
}

Used by	Description
WP_Taxonomy::add_rewrite_rules()`wp-includes/class-wp-taxonomy.php`	Adds the necessary rewrite rules for the taxonomy.
WP_Post_Type::add_rewrite_rules()`wp-includes/class-wp-post-type.php`	Adds the necessary rewrite rules for the post type.
rest_api_init()`wp-includes/rest-api.php`	Registers rewrite rules for the REST API.
WP_Rewrite::add_endpoint()`wp-includes/class-wp-rewrite.php`	Adds an endpoint, like /trackback/.
add_rewrite_tag()`wp-includes/rewrite.php`	Adds a new rewrite tag (like %postname%).

Version	Description
2.1.0	Introduced.

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