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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;

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;

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;

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