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query.php
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3575 lines (3124 loc) · 90.8 KB
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<?php
/**
* WordPress Query API
*
* The query API attempts to get which part of WordPress to the user is on. It
* also provides functionality to getting URL query information.
*
* @link http://codex.wordpress.org/The_Loop More information on The Loop.
*
* @package WordPress
* @subpackage Query
*/
/**
* Retrieve variable in the WP_Query class.
*
* @see WP_Query::get()
* @since 1.5.0
* @uses $wp_query
*
* @param string $var The variable key to retrieve.
* @return mixed
*/
function get_query_var($var) {
global $wp_query;
return $wp_query->get($var);
}
/**
* Retrieve the currently-queried object. Wrapper for $wp_query->get_queried_object()
*
* @uses WP_Query::get_queried_object
*
* @since 3.1.0
* @access public
*
* @return object
*/
function get_queried_object() {
global $wp_query;
return $wp_query->get_queried_object();
}
/**
* Retrieve ID of the current queried object. Wrapper for $wp_query->get_queried_object_id()
*
* @uses WP_Query::get_queried_object_id()
*
* @since 3.1.0
* @access public
*
* @return int
*/
function get_queried_object_id() {
global $wp_query;
return $wp_query->get_queried_object_id();
}
/**
* Set query variable.
*
* @see WP_Query::set()
* @since 2.2.0
* @uses $wp_query
*
* @param string $var Query variable key.
* @param mixed $value
* @return null
*/
function set_query_var($var, $value) {
global $wp_query;
return $wp_query->set($var, $value);
}
/**
* Set up The Loop with query parameters.
*
* This will override the current WordPress Loop and shouldn't be used more than
* once. This must not be used within the WordPress Loop.
*
* @since 1.5.0
* @uses $wp_query
*
* @param string $query
* @return array List of posts
*/
function &query_posts($query) {
unset($GLOBALS['wp_query']);
$GLOBALS['wp_query'] =& new WP_Query();
return $GLOBALS['wp_query']->query($query);
}
/**
* Destroy the previous query and set up a new query.
*
* This should be used after {@link query_posts()} and before another {@link
* 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
* @uses $wp_query
*/
function wp_reset_query() {
unset($GLOBALS['wp_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
* @uses $wp_query
*/
function wp_reset_postdata() {
global $wp_query;
if ( !empty($wp_query->post) ) {
$GLOBALS['post'] = $wp_query->post;
setup_postdata($wp_query->post);
}
}
/*
* Query type checks.
*/
/**
* Is the query for an archive page?
*
* Month, Year, Category, Author, Post Type archive...
*
* @see WP_Query::is_archive()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
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' );
return false;
}
return $wp_query->is_archive();
}
/**
* Is the query for a post type archive page?
*
* @see WP_Query::is_post_type_archive()
* @since 3.1.0
* @uses $wp_query
*
* @param mixed $post_types Optional. Post type or array of posts types to check against.
* @return bool
*/
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' );
return false;
}
return $wp_query->is_post_type_archive( $post_types );
}
/**
* Is the query for an attachment page?
*
* @see WP_Query::is_attachment()
* @since 2.0.0
* @uses $wp_query
*
* @return bool
*/
function is_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' );
return false;
}
return $wp_query->is_attachment();
}
/**
* Is the query for an author archive page?
*
* If the $author parameter is specified, this function will additionally
* check if the query is for one of the authors specified.
*
* @see WP_Query::is_author()
* @since 1.5.0
* @uses $wp_query
*
* @param mixed $author Optional. User ID, nickname, nicename, or array of User IDs, nicknames, and nicenames
* @return bool
*/
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' );
return false;
}
return $wp_query->is_author( $author );
}
/**
* Is the query for a category archive page?
*
* If the $category parameter is specified, this function will additionally
* check if the query is for one of the categories specified.
*
* @see WP_Query::is_category()
* @since 1.5.0
* @uses $wp_query
*
* @param mixed $category Optional. Category ID, name, slug, or array of Category IDs, names, and slugs.
* @return bool
*/
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' );
return false;
}
return $wp_query->is_category( $category );
}
/**
* Is the query for a tag archive page?
*
* If the $tag parameter is specified, this function will additionally
* check if the query is for one of the tags specified.
*
* @see WP_Query::is_tag()
* @since 2.3.0
* @uses $wp_query
*
* @param mixed $slug Optional. Tag slug or array of slugs.
* @return bool
*/
function is_tag( $slug = '' ) {
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' );
return false;
}
return $wp_query->is_tag( $slug );
}
/**
* Is the query for a 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.
*
* @see WP_Query::is_tax()
* @since 2.5.0
* @uses $wp_query
*
* @param mixed $taxonomy Optional. Taxonomy slug or slugs.
* @param mixed $term Optional. Term ID, name, slug or array of Term IDs, names, and slugs.
* @return bool
*/
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' );
return false;
}
return $wp_query->is_tax( $taxonomy, $term );
}
/**
* Whether the current URL is within the comments popup window.
*
* @see WP_Query::is_comments_popup()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
function is_comments_popup() {
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' );
return false;
}
return $wp_query->is_comments_popup();
}
/**
* Is the query for a date archive?
*
* @see WP_Query::is_date()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
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' );
return false;
}
return $wp_query->is_date();
}
/**
* Is the query for a day archive?
*
* @see WP_Query::is_day()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
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' );
return false;
}
return $wp_query->is_day();
}
/**
* Is the query for a feed?
*
* @see WP_Query::is_feed()
* @since 1.5.0
* @uses $wp_query
*
* @param string|array $feeds Optional feed types to check.
* @return bool
*/
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' );
return false;
}
return $wp_query->is_feed( $feeds );
}
/**
* Is the query for a comments feed?
*
* @see WP_Query::is_comments_feed()
* @since 3.0.0
* @uses $wp_query
*
* @return bool
*/
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' );
return false;
}
return $wp_query->is_comment_feed();
}
/**
* Is the query 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()
*
* @see WP_Query::is_front_page()
* @since 2.5.0
* @uses is_home()
* @uses get_option()
*
* @return bool True, if front of site.
*/
function is_front_page() {
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' );
return false;
}
return $wp_query->is_front_page();
}
/**
* Is the query for the blog homepage?
*
* This is the page which shows the time based blog content of your site.
*
* Depends on the site's "Front page displays" Reading Settings 'show_on_front' and 'page_for_posts'.
*
* If you set a static page for the front page of your site, this function will return
* true only on the page you set as the "Posts page".
*
* @see is_front_page()
*
* @see WP_Query::is_home()
* @since 1.5.0
* @uses $wp_query
*
* @return bool True if blog view homepage.
*/
function is_home() {
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' );
return false;
}
return $wp_query->is_home();
}
/**
* Is the query for a month archive?
*
* @see WP_Query::is_month()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
function is_month() {
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' );
return false;
}
return $wp_query->is_month();
}
/**
* Is the query for a single page?
*
* If the $page parameter is specified, this function will additionally
* check if the query is for one of the pages specified.
*
* @see is_single()
* @see is_singular()
*
* @see WP_Query::is_page()
* @since 1.5.0
* @uses $wp_query
*
* @param mixed $page Page ID, title, slug, or array of such.
* @return bool
*/
function is_page( $page = '' ) {
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' );
return false;
}
return $wp_query->is_page( $page );
}
/**
* Is the query for paged result and not for the first page?
*
* @see WP_Query::is_paged()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
function is_paged() {
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' );
return false;
}
return $wp_query->is_paged();
}
/**
* Is the query for a post or page preview?
*
* @see WP_Query::is_preview()
* @since 2.0.0
* @uses $wp_query
*
* @return bool
*/
function is_preview() {
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' );
return false;
}
return $wp_query->is_preview();
}
/**
* Is the query for the robots file?
*
* @see WP_Query::is_robots()
* @since 2.1.0
* @uses $wp_query
*
* @return bool
*/
function is_robots() {
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' );
return false;
}
return $wp_query->is_robots();
}
/**
* Is the query for a search?
*
* @see WP_Query::is_search()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
function is_search() {
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' );
return false;
}
return $wp_query->is_search();
}
/**
* Is the query for a 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.
*
* @see is_page()
* @see is_singular()
*
* @see WP_Query::is_single()
* @since 1.5.0
* @uses $wp_query
*
* @param mixed $post Post ID, title, slug, or array of such.
* @return bool
*/
function is_single( $post = '' ) {
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' );
return false;
}
return $wp_query->is_single( $post );
}
/**
* Is the query for a single post of any post type (post, attachment, page, ... )?
*
* If the $post_types parameter is specified, this function will additionally
* check if the query is for one of the Posts Types specified.
*
* @see is_page()
* @see is_single()
*
* @see WP_Query::is_singular()
* @since 1.5.0
* @uses $wp_query
*
* @param mixed $post_types Optional. Post Type or array of Post Types
* @return bool
*/
function is_singular( $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' );
return false;
}
return $wp_query->is_singular( $post_types );
}
/**
* Is the query for a specific time?
*
* @see WP_Query::is_time()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
function is_time() {
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' );
return false;
}
return $wp_query->is_time();
}
/**
* Is the query for a trackback endpoint call?
*
* @see WP_Query::is_trackback()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
function is_trackback() {
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' );
return false;
}
return $wp_query->is_trackback();
}
/**
* Is the query for a specific year?
*
* @see WP_Query::is_year()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
function is_year() {
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' );
return false;
}
return $wp_query->is_year();
}
/**
* Is the query a 404 (returns no results)?
*
* @see WP_Query::is_404()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
function is_404() {
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' );
return false;
}
return $wp_query->is_404();
}
/*
* The Loop. Post loop control.
*/
/**
* Whether current WordPress query has results to loop over.
*
* @see WP_Query::have_posts()
* @since 1.5.0
* @uses $wp_query
*
* @return bool
*/
function have_posts() {
global $wp_query;
return $wp_query->have_posts();
}
/**
* Whether the caller is in the Loop.
*
* @since 2.0.0
* @uses $wp_query
*
* @return bool True if caller is within loop, false if loop hasn't started or ended.
*/
function in_the_loop() {
global $wp_query;
return $wp_query->in_the_loop;
}
/**
* Rewind the loop posts.
*
* @see WP_Query::rewind_posts()
* @since 1.5.0
* @uses $wp_query
*
* @return null
*/
function rewind_posts() {
global $wp_query;
return $wp_query->rewind_posts();
}
/**
* Iterate the post index in the loop.
*
* @see WP_Query::the_post()
* @since 1.5.0
* @uses $wp_query
*/
function the_post() {
global $wp_query;
$wp_query->the_post();
}
/*
* Comments loop.
*/
/**
* Whether there are comments to loop over.
*
* @see WP_Query::have_comments()
* @since 2.2.0
* @uses $wp_query
*
* @return bool
*/
function have_comments() {
global $wp_query;
return $wp_query->have_comments();
}
/**
* Iterate comment index in the comment loop.
*
* @see WP_Query::the_comment()
* @since 2.2.0
* @uses $wp_query
*
* @return object
*/
function the_comment() {
global $wp_query;
return $wp_query->the_comment();
}
/*
* WP_Query
*/
/**
* The WordPress Query class.
*
* @link http://codex.wordpress.org/Function_Reference/WP_Query Codex page.
*
* @since 1.5.0
*/
class WP_Query {
/**
* Query vars set by the user
*
* @since 1.5.0
* @access public
* @var array
*/
var $query;
/**
* Query vars, after parsing
*
* @since 1.5.0
* @access public
* @var array
*/
var $query_vars = array();
/**
* Taxonomy query, as passed to get_tax_sql()
*
* @since 3.1.0
* @access public
* @var object WP_Tax_Query
*/
var $tax_query;
/**
* Metadata query container
*
* @since 3.2.0
* @access public
* @var object WP_Meta_Query
*/
var $meta_query = false;
/**
* Holds the data for a single object that is queried.
*
* Holds the contents of a post, page, category, attachment.
*
* @since 1.5.0
* @access public
* @var object|array
*/
var $queried_object;
/**
* The ID of the queried object.
*
* @since 1.5.0
* @access public
* @var int
*/
var $queried_object_id;
/**
* Get post database query.
*
* @since 2.0.1
* @access public
* @var string
*/
var $request;
/**
* List of posts.
*
* @since 1.5.0
* @access public
* @var array
*/
var $posts;
/**
* The amount of posts for the current query.
*
* @since 1.5.0
* @access public
* @var int
*/
var $post_count = 0;
/**
* Index of the current item in the loop.
*
* @since 1.5.0
* @access public
* @var int
*/
var $current_post = -1;
/**
* Whether the loop has started and the caller is in the loop.
*
* @since 2.0.0
* @access public
* @var bool
*/
var $in_the_loop = false;
/**
* The current post ID.
*
* @since 1.5.0
* @access public
* @var object
*/
var $post;
/**
* The list of comments for current post.
*
* @since 2.2.0
* @access public
* @var array
*/
var $comments;
/**
* The amount of comments for the posts.
*
* @since 2.2.0
* @access public
* @var int
*/
var $comment_count = 0;
/**
* The index of the comment in the comment loop.
*
* @since 2.2.0
* @access public
* @var int
*/
var $current_comment = -1;
/**
* Current comment ID.
*
* @since 2.2.0
* @access public
* @var int
*/
var $comment;
/**
* Amount of posts if limit clause was not used.
*
* @since 2.1.0
* @access public
* @var int
*/
var $found_posts = 0;
/**
* The amount of pages.
*
* @since 2.1.0
* @access public
* @var int
*/
var $max_num_pages = 0;
/**
* The amount of comment pages.
*
* @since 2.7.0
* @access public
* @var int
*/
var $max_num_comment_pages = 0;
/**
* Set if query is single post.
*
* @since 1.5.0