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<?php
/**
* 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.
*
* @link https://developer.wordpress.org/themes/basics/the-loop/ More information on The Loop.
*
* @package WordPress
* @subpackage Query
*/
/**
* Retrieves the value of a query variable in the WP_Query class.
*
* @since 1.5.0
* @since 3.9.0 The `$default_value` argument was introduced.
*
* @global WP_Query $wp_query WordPress Query object.
*
* @param string $query_var The variable key to retrieve.
* @param mixed $default_value Optional. Value to return if the query variable is not set.
* Default empty string.
* @return mixed Contents of the query variable.
*/
function get_query_var( $query_var, $default_value = '' ) {
global $wp_query;
return $wp_query->get( $query_var, $default_value );
}
/**
* Retrieves the currently queried object.
*
* Wrapper for WP_Query::get_queried_object().
*
* @since 3.1.0
*
* @global WP_Query $wp_query WordPress Query object.
*
* @return WP_Term|WP_Post_Type|WP_Post|WP_User|null The queried object.
*/
function get_queried_object() {
global $wp_query;
return $wp_query->get_queried_object();
}
/**
* Retrieves the ID of the currently queried object.
*
* Wrapper for WP_Query::get_queried_object_id().
*
* @since 3.1.0
*
* @global WP_Query $wp_query WordPress Query object.
*
* @return int ID of the queried object.
*/
function get_queried_object_id() {
global $wp_query;
return $wp_query->get_queried_object_id();
}
/**
* Sets the value of a query variable in the WP_Query class.
*
* @since 2.2.0
*
* @global WP_Query $wp_query WordPress Query object.
*
* @param string $query_var Query variable key.
* @param mixed $value Query variable value.
*/
function set_query_var( $query_var, $value ) {
global $wp_query;
$wp_query->set( $query_var, $value );
}
/**
* 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.
*
* @since 1.5.0
*
* @global WP_Query $wp_query WordPress Query object.
*
* @param array|string $query Array or string of WP_Query arguments.
* @return WP_Post[]|int[] Array of post objects or post IDs.
*/
function query_posts( $query ) {
$GLOBALS['wp_query'] = new WP_Query();
return $GLOBALS['wp_query']->query( $query );
}
/**
* 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.
*
* @since 2.3.0
*
* @global WP_Query $wp_query WordPress Query object.
* @global WP_Query $wp_the_query Copy of the global WP_Query instance created during wp_reset_query().
*/
function wp_reset_query() {
$GLOBALS['wp_query'] = $GLOBALS['wp_the_query'];
wp_reset_postdata();
}
/**
* After looping through a separate query, this function restores
* the $post global to the current post in the main query.
*
* @since 3.0.0
*
* @global WP_Query $wp_query WordPress Query object.
*/
function wp_reset_postdata() {
global $wp_query;
if ( isset( $wp_query ) ) {
$wp_query->reset_postdata();
}
}
/*
* Query type checks.
*/
/**
* 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.
*
* @since 1.5.0
*
* @see is_category()
* @see is_tag()
* @see is_author()
* @see is_date()
* @see is_post_type_archive()
* @see is_tax()
* @global WP_Query $wp_query WordPress Query object.
*
* @return bool Whether the query is for an existing archive page.
*/
function is_archive() {
global $wp_query;
if ( ! isset( $wp_query ) ) {
_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' );
return false;
}
return $wp_query->is_archive();
}
/**
* 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.
*
* @since 3.1.0
*
* @global WP_Query $wp_query WordPress Query object.
*
* @param string|string[] $post_types Optional. Post type or array of posts types
* to check against. Default empty.
* @return bool Whether the query is for an existing post type archive page.
*/
function is_post_type_archive( $post_types = '' ) {
global $wp_query;
if ( ! isset( $wp_query ) ) {
_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' );
return false;
}
return $wp_query->is_post_type_archive( $post_types );
}
/**
* 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.
*
* @since 2.0.0
*
* @global WP_Query $wp_query WordPress Query object.
*
* @param int|string|int[]|string[] $attachment Optional. Attachment ID, title, slug, or array of such
* to check against. Default empty.
* @return bool Whether the query is for an existing attachment page.
*/
function is_attachment( $attachment = '' ) {
global $wp_query;
if ( ! isset( $wp_query ) ) {
_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' );
return false;
}
return $wp_query->is_attachment( $attachment );
}
/**
* 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.
*
* @since 1.5.0
*
* @global WP_Query $wp_query WordPress Query object.
*
* @param int|string|int[]|string[] $author Optional. User ID, nickname, nicename, or array of such
* to check against. Default empty.
* @return bool Whether the query is for an existing author archive page.
*/
function is_author( $author = '' ) {
global $wp_query;
if ( ! isset( $wp_query ) ) {
_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' );
return false;
}
return $wp_query->is_author( $author );
}
/**
* 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.
*
* @since 1.5.0
*
* @global WP_Query $wp_query WordPress Query object.
*
* @param int|string|int[]|string[] $category Option