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/wp-includes/ -> query.php (summary)

WordPress Query API The query API attempts to get which part of WordPress the user is on. It also provides functionality for getting URL query information.

File Size: 1199 lines (36 kb)
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Defines 47 functions

  get_query_var()
  get_queried_object()
  get_queried_object_id()
  set_query_var()
  query_posts()
  wp_reset_query()
  wp_reset_postdata()
  is_archive()
  is_post_type_archive()
  is_attachment()
  is_author()
  is_category()
  is_tag()
  is_tax()
  is_date()
  is_day()
  is_feed()
  is_comment_feed()
  is_front_page()
  is_home()
  is_privacy_policy()
  is_month()
  is_page()
  is_paged()
  is_preview()
  is_robots()
  is_favicon()
  is_search()
  is_single()
  is_singular()
  is_time()
  is_trackback()
  is_year()
  is_404()
  is_embed()
  is_main_query()
  have_posts()
  in_the_loop()
  rewind_posts()
  the_post()
  have_comments()
  the_comment()
  wp_old_slug_redirect()
  _find_post_by_old_slug()
  _find_post_by_old_date()
  setup_postdata()
  generate_postdata()

Functions
Functions that are not part of a class:

get_query_var( $var, $default = '' )   X-Ref
Retrieves the value of a query variable in the WP_Query class.

return: mixed Contents of the query variable.
param: string $var       The variable key to retrieve.
param: mixed  $default   Optional. Value to return if the query variable is not set. Default empty.

get_queried_object()   X-Ref
Retrieves the currently queried object.

Wrapper for WP_Query::get_queried_object().

return: WP_Term|WP_Post_Type|WP_Post|WP_User|null The queried object.

get_queried_object_id()   X-Ref
Retrieves the ID of the currently queried object.

Wrapper for WP_Query::get_queried_object_id().

return: int ID of the queried object.

set_query_var( $var, $value )   X-Ref
Sets the value of a query variable in the WP_Query class.

param: string $var   Query variable key.
param: mixed  $value Query variable value.

query_posts( $query )   X-Ref
Sets up The Loop with query parameters.

Note: This function will completely override the main query and isn't intended for use
by plugins or themes. Its overly-simplistic approach to modifying the main query can be
problematic and should be avoided wherever possible. In most cases, there are better,
more performant options for modifying the main query such as via the {@see 'pre_get_posts'}
action within WP_Query.

This must not be used within the WordPress Loop.

return: WP_Post[]|int[] Array of post objects or post IDs.
param: array|string $query Array or string of WP_Query arguments.

wp_reset_query()   X-Ref
Destroys the previous query and sets up a new query.

This should be used after query_posts() and before another query_posts().
This will remove obscure bugs that occur when the previous WP_Query object
is not destroyed properly before another is set up.


wp_reset_postdata()   X-Ref
After looping through a separate query, this function restores
the $post global to the current post in the main query.


is_archive()   X-Ref
Determines whether the query is for an existing archive page.

Archive pages include category, tag, author, date, custom post type,
and custom taxonomy based archives.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing archive page.

is_post_type_archive( $post_types = '' )   X-Ref
Determines whether the query is for an existing post type archive page.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing post type archive page.
param: string|string[] $post_types Optional. Post type or array of posts types

is_attachment( $attachment = '' )   X-Ref
Determines whether the query is for an existing attachment page.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing attachment page.
param: int|string|int[]|string[] $attachment Optional. Attachment ID, title, slug, or array of such

is_author( $author = '' )   X-Ref
Determines whether the query is for an existing author archive page.

If the $author parameter is specified, this function will additionally
check if the query is for one of the authors specified.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing author archive page.
param: int|string|int[]|string[] $author Optional. User ID, nickname, nicename, or array of such

is_category( $category = '' )   X-Ref
Determines whether the query is for an existing category archive page.

If the $category parameter is specified, this function will additionally
check if the query is for one of the categories specified.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing category archive page.
param: int|string|int[]|string[] $category Optional. Category ID, name, slug, or array of such

is_tag( $tag = '' )   X-Ref
Determines whether the query is for an existing tag archive page.

If the $tag parameter is specified, this function will additionally
check if the query is for one of the tags specified.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing tag archive page.
param: int|string|int[]|string[] $tag Optional. Tag ID, name, slug, or array of such

is_tax( $taxonomy = '', $term = '' )   X-Ref
Determines whether the query is for an existing custom taxonomy archive page.

If the $taxonomy parameter is specified, this function will additionally
check if the query is for that specific $taxonomy.

If the $term parameter is specified in addition to the $taxonomy parameter,
this function will additionally check if the query is for one of the terms
specified.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing custom taxonomy archive page.
param: string|string[]           $taxonomy Optional. Taxonomy slug or slugs to check against.
param: int|string|int[]|string[] $term     Optional. Term ID, name, slug, or array of such

is_date()   X-Ref
Determines whether the query is for an existing date archive.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing date archive.

is_day()   X-Ref
Determines whether the query is for an existing day archive.

A conditional check to test whether the page is a date-based archive page displaying posts for the current day.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing day archive.

is_feed( $feeds = '' )   X-Ref
Determines whether the query is for a feed.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for a feed.
param: string|string[] $feeds Optional. Feed type or array of feed types

is_comment_feed()   X-Ref
Is the query for a comments feed?

return: bool Whether the query is for a comments feed.

is_front_page()   X-Ref
Determines whether the query is for the front page of the site.

This is for what is displayed at your site's main URL.

Depends on the site's "Front page displays" Reading Settings 'show_on_front' and 'page_on_front'.

If you set a static page for the front page of your site, this function will return
true when viewing that page.

Otherwise the same as @see is_home()

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for the front page of the site.

is_home()   X-Ref
Determines whether the query is for the blog homepage.

The blog homepage is the page that shows the time-based blog content of the site.

is_home() is dependent on the site's "Front page displays" Reading Settings 'show_on_front'
and 'page_for_posts'.

If a static page is set for the front page of the site, this function will return true only
on the page you set as the "Posts page".

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for the blog homepage.

is_privacy_policy()   X-Ref
Determines whether the query is for the Privacy Policy page.

The Privacy Policy page is the page that shows the Privacy Policy content of the site.

is_privacy_policy() is dependent on the site's "Change your Privacy Policy page" Privacy Settings 'wp_page_for_privacy_policy'.

This function will return true only on the page you set as the "Privacy Policy page".

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for the Privacy Policy page.

is_month()   X-Ref
Determines whether the query is for an existing month archive.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing month archive.

is_page( $page = '' )   X-Ref
Determines whether the query is for an existing single page.

If the $page parameter is specified, this function will additionally
check if the query is for one of the pages specified.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing single page.
param: int|string|int[]|string[] $page Optional. Page ID, title, slug, or array of such

is_paged()   X-Ref
Determines whether the query is for a paged result and not for the first page.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for a paged result.

is_preview()   X-Ref
Determines whether the query is for a post or page preview.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for a post or page preview.

is_robots()   X-Ref
Is the query for the robots.txt file?

return: bool Whether the query is for the robots.txt file.

is_favicon()   X-Ref
Is the query for the favicon.ico file?

return: bool Whether the query is for the favicon.ico file.

is_search()   X-Ref
Determines whether the query is for a search.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for a search.

is_single( $post = '' )   X-Ref
Determines whether the query is for an existing single post.

Works for any post type, except attachments and pages

If the $post parameter is specified, this function will additionally
check if the query is for one of the Posts specified.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing single post.
param: int|string|int[]|string[] $post Optional. Post ID, title, slug, or array of such

is_singular( $post_types = '' )   X-Ref
Determines whether the query is for an existing single post of any post type
(post, attachment, page, custom post types).

If the $post_types parameter is specified, this function will additionally
check if the query is for one of the Posts Types specified.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing single post
param: string|string[] $post_types Optional. Post type or array of post types

is_time()   X-Ref
Determines whether the query is for a specific time.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for a specific time.

is_trackback()   X-Ref
Determines whether the query is for a trackback endpoint call.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for a trackback endpoint call.

is_year()   X-Ref
Determines whether the query is for an existing year archive.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is for an existing year archive.

is_404()   X-Ref
Determines whether the query has resulted in a 404 (returns no results).

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is a 404 error.

is_embed()   X-Ref
Is the query for an embedded post?

return: bool Whether the query is for an embedded post.

is_main_query()   X-Ref
Determines whether the query is the main query.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool Whether the query is the main query.

have_posts()   X-Ref
Determines whether current WordPress query has posts to loop over.

return: bool True if posts are available, false if end of the loop.

in_the_loop()   X-Ref
Determines whether the caller is in the Loop.

For more information on this and similar theme functions, check out
the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
Conditional Tags} article in the Theme Developer Handbook.

return: bool True if caller is within loop, false if loop hasn't started or ended.

rewind_posts()   X-Ref
Rewind the loop posts.


the_post()   X-Ref
Iterate the post index in the loop.


have_comments()   X-Ref
Determines whether current WordPress query has comments to loop over.

return: bool True if comments are available, false if no more comments.

the_comment()   X-Ref
Iterate comment index in the comment loop.

return: null

wp_old_slug_redirect()   X-Ref
Redirect old slugs to the correct permalink.

Attempts to find the current slug from the past slugs.


_find_post_by_old_slug( $post_type )   X-Ref
Find the post ID for redirecting an old slug.

return: int The Post ID.
param: string $post_type The current post type based on the query vars.

_find_post_by_old_date( $post_type )   X-Ref
Find the post ID for redirecting an old date.

return: int The Post ID.
param: string $post_type The current post type based on the query vars.

setup_postdata( $post )   X-Ref
Set up global post data.

return: bool True when finished.
param: WP_Post|object|int $post WP_Post instance or Post ID/object.

generate_postdata( $post )   X-Ref
Generates post data.

return: array|false Elements of post, or false on failure.
param: WP_Post|object|int $post WP_Post instance or Post ID/object.



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