get_query_var( string $query_var, mixed $default_value = '' )

Retrieves the value of a query variable in the WP_Query class.

Parameters

$query_var

(Required) The variable key to retrieve.

$default_value

(Optional) Value to return if the query variable is not set.<br>

Default value: ''

Return

(mixed) Contents of the query variable.

Source

File: wp-includes/query.php 

function get_query_var( $var, $default = '' ) {
	global $wp_query;
	return $wp_query->get( $var, $default );
}

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Related

Used By

Used By
Used By Description
wp-admin/includes/class-wp-media-list-table.php: WP_Media_List_Table::media_categories_dropdown()

Displays a media categories drop-down for filtering on the Media list table.
wp-includes/general-template.php: get_search_query()

Retrieves the contents of the search WordPress query variable.
wp-includes/general-template.php: paginate_links()

Retrieves paginated links for archive post pages.
wp-includes/general-template.php: feed_links_extra()

Displays the links to the extra feeds such as category feeds.
wp-includes/general-template.php: get_the_post_type_description()

Retrieves the description for a post type archive.
wp-includes/general-template.php: wp_get_archives()

Displays archive links based on type and format.
wp-includes/general-template.php: wp_title()

Displays or retrieves page title for all areas of blog.
wp-includes/general-template.php: post_type_archive_title()

Displays or retrieves title for a post type archive.
wp-includes/general-template.php: single_month_title()

Displays or retrieves page title for post archive based on date.
wp-includes/template.php: get_page_template()

Retrieves path of page template in current or parent template.
wp-includes/template.php: get_archive_template()

Retrieves path of archive template in current or parent template.
wp-includes/template.php: get_post_type_archive_template()

Retrieves path of post type archive template in current or parent template.
wp-includes/query.php: wp_old_slug_redirect()

Redirect old slugs to the correct permalink.
wp-includes/query.php: _find_post_by_old_slug()

Find the post ID for redirecting an old slug.
wp-includes/query.php: _find_post_by_old_date()

Find the post ID for redirecting an old date.
wp-includes/link-template.php: wp_get_canonical_url()

Returns the canonical URL for a post.
wp-includes/link-template.php: get_next_comments_link()

Retrieves the link to the next comments page.
wp-includes/link-template.php: get_previous_comments_link()

Retrieves the link to the previous comments page.
wp-includes/link-template.php: paginate_comments_links()

Displays or retrieves pagination links for the comments on the current post.
wp-includes/link-template.php: get_posts_nav_link()

Retrieves the post pages link navigation for previous and next pages.
wp-includes/post-template.php: get_body_class()

Retrieves an array of the class names for the body element.
wp-includes/canonical.php: redirect_canonical()

Redirects incoming links to the proper URL based on the site url.
wp-includes/canonical.php: redirect_guess_404_permalink()

Attempts to guess the correct URL for a 404 request based on query vars.
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Changelog

Changelog
Version Description
3.9.0 The $default_value argument was introduced.
1.5.0 Introduced.