<?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` argument was introduced.

 *

 * @global WP_Query $wp_query WordPress Query object.

 *

 * @param string $var       The variable key to retrieve.

 * @param mixed  $default   Optional. Value to return if the query variable is not set. Default empty.

 * @return mixed Contents of the query variable.

 */

function get_query_var( $var, $default = '' ) {

	global $wp_query;

	return $wp_query->get( $var, $default );

}

/**

 * 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 $var   Query variable key.

 * @param mixed  $value Query variable value.

 */

function set_query_var( $var, $value ) {

	global $wp_query;

	$wp_query->set( $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 Optional. Category ID, name, slug, or array of such

 *                                            to check against. Default empty.

 * @return bool Whether the query is for an existing category archive page.

 */

function is_category( $category = '' ) {

	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_category( $category );

}

/**

 * 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.

 *

 * @since 2.3.0

 *

 * @global WP_Query $wp_query WordPress Query object.

 *

 * @param int|string|int[]|string[] $tag Optional. Tag ID, name, slug, or array of such

 *                                       to check against. Default empty.

 * @return bool Whether the query is for an existing tag archive page.

 */

function is_tag( $tag = '' ) {

	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_tag( $tag );

}

/**

 * 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.

 *

 * @since 2.5.0

 *

 * @global WP_Query $wp_query WordPress Query object.

 *

 * @param string|string[]           $taxonomy Optional. Taxonomy slug or slugs to check against.

 *                                            Default empty.

 * @param int|string|int[]|string[] $term     Optional. Term ID, name, slug, or array of such

 *                                            to check against. Default empty.

 * @return bool Whether the query is for an existing custom taxonomy archive page.

 *              True for custom taxonomy archive pages, false for built-in taxonomies

 *              (category and tag archives).

 */

function is_tax( $taxonomy = '', $term = '' ) {

	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_tax( $taxonomy, $term );

}

/**

 * 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.

 *

 * @since 1.5.0

 *

 * @global WP_Query $wp_query WordPress Query object.

 *

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

 */

function is_date() {

	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_date();

}

/**

 * 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.

 *

 * @since 1.5.0

 *

 * @global WP_Query $wp_query WordPress Query object.

 *

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

 */

function is_day() {

	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_day();

}

/**

 * 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.

 *

 * @since 1.5.0

 *

 * @global WP_Query $wp_query WordPress Query object.

 *

 * @param string|string[] $feeds Optional. Feed type or array of feed types

 *                                         to check against. Default empty.

 * @return bool Whether the query is for a feed.

 */

function is_feed( $feeds = '' ) {

	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_feed( $feeds );

}

/**

 * Is the query for a comments feed?

 *

 * @since 3.0.0

 *

 * @global WP_Query $wp_query WordPress Query object.

 *

 * @return bool Whether the query is for a comments feed.

 */

function is_comment_feed() {

	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_comment_feed();

}

/**

 * Determines whether the query is for the front page of the site.

 *

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

 *