wp/wp-includes/class-wp-user-query.php
changeset 7 cf61fcea0001
child 9 177826044cd9
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/class-wp-user-query.php	Mon Oct 14 17:39:30 2019 +0200
@@ -0,0 +1,860 @@
+<?php
+/**
+ * User API: WP_User_Query class
+ *
+ * @package WordPress
+ * @subpackage Users
+ * @since 4.4.0
+ */
+
+/**
+ * Core class used for querying users.
+ *
+ * @since 3.1.0
+ *
+ * @see WP_User_Query::prepare_query() for information on accepted arguments.
+ */
+class WP_User_Query {
+
+	/**
+	 * Query vars, after parsing
+	 *
+	 * @since 3.5.0
+	 * @var array
+	 */
+	public $query_vars = array();
+
+	/**
+	 * List of found user ids
+	 *
+	 * @since 3.1.0
+	 * @var array
+	 */
+	private $results;
+
+	/**
+	 * Total number of found users for the current query
+	 *
+	 * @since 3.1.0
+	 * @var int
+	 */
+	private $total_users = 0;
+
+	/**
+	 * Metadata query container.
+	 *
+	 * @since 4.2.0
+	 * @var WP_Meta_Query
+	 */
+	public $meta_query = false;
+
+	/**
+	 * The SQL query used to fetch matching users.
+	 *
+	 * @since 4.4.0
+	 * @var string
+	 */
+	public $request;
+
+	private $compat_fields = array( 'results', 'total_users' );
+
+	// SQL clauses
+	public $query_fields;
+	public $query_from;
+	public $query_where;
+	public $query_orderby;
+	public $query_limit;
+
+	/**
+	 * PHP5 constructor.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @param null|string|array $query Optional. The query variables.
+	 */
+	public function __construct( $query = null ) {
+		if ( ! empty( $query ) ) {
+			$this->prepare_query( $query );
+			$this->query();
+		}
+	}
+
+	/**
+	 * Fills in missing query variables with default values.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param array $args Query vars, as passed to `WP_User_Query`.
+	 * @return array Complete query variables with undefined ones filled in with defaults.
+	 */
+	public static function fill_query_vars( $args ) {
+		$defaults = array(
+			'blog_id' => get_current_blog_id(),
+			'role' => '',
+			'role__in' => array(),
+			'role__not_in' => array(),
+			'meta_key' => '',
+			'meta_value' => '',
+			'meta_compare' => '',
+			'include' => array(),
+			'exclude' => array(),
+			'search' => '',
+			'search_columns' => array(),
+			'orderby' => 'login',
+			'order' => 'ASC',
+			'offset' => '',
+			'number' => '',
+			'paged' => 1,
+			'count_total' => true,
+			'fields' => 'all',
+			'who' => '',
+			'has_published_posts' => null,
+			'nicename' => '',
+			'nicename__in' => array(),
+			'nicename__not_in' => array(),
+			'login' => '',
+			'login__in' => array(),
+			'login__not_in' => array()
+		);
+
+		return wp_parse_args( $args, $defaults );
+	}
+
+	/**
+	 * Prepare the query variables.
+	 *
+	 * @since 3.1.0
+	 * @since 4.1.0 Added the ability to order by the `include` value.
+	 * @since 4.2.0 Added 'meta_value_num' support for `$orderby` parameter. Added multi-dimensional array syntax
+	 *              for `$orderby` parameter.
+	 * @since 4.3.0 Added 'has_published_posts' parameter.
+	 * @since 4.4.0 Added 'paged', 'role__in', and 'role__not_in' parameters. The 'role' parameter was updated to
+	 *              permit an array or comma-separated list of values. The 'number' parameter was updated to support
+	 *              querying for all users with using -1.
+	 * @since 4.7.0 Added 'nicename', 'nicename__in', 'nicename__not_in', 'login', 'login__in',
+	 *              and 'login__not_in' parameters.
+	 *
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 * @global int  $blog_id
+	 *
+	 * @param string|array $query {
+	 *     Optional. Array or string of Query parameters.
+	 *
+	 *     @type int          $blog_id             The site ID. Default is the current site.
+	 *     @type string|array $role                An array or a comma-separated list of role names that users must match
+	 *                                             to be included in results. Note that this is an inclusive list: users
+	 *                                             must match *each* role. Default empty.
+	 *     @type array        $role__in            An array of role names. Matched users must have at least one of these
+	 *                                             roles. Default empty array.
+	 *     @type array        $role__not_in        An array of role names to exclude. Users matching one or more of these
+	 *                                             roles will not be included in results. Default empty array.
+	 *     @type string       $meta_key            User meta key. Default empty.
+	 *     @type string       $meta_value          User meta value. Default empty.
+	 *     @type string       $meta_compare        Comparison operator to test the `$meta_value`. Accepts '=', '!=',
+	 *                                             '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE', 'IN', 'NOT IN',
+	 *                                             'BETWEEN', 'NOT BETWEEN', 'EXISTS', 'NOT EXISTS', 'REGEXP',
+	 *                                             'NOT REGEXP', or 'RLIKE'. Default '='.
+	 *     @type array        $include             An array of user IDs to include. Default empty array.
+	 *     @type array        $exclude             An array of user IDs to exclude. Default empty array.
+	 *     @type string       $search              Search keyword. Searches for possible string matches on columns.
+	 *                                             When `$search_columns` is left empty, it tries to determine which
+	 *                                             column to search in based on search string. Default empty.
+	 *     @type array        $search_columns      Array of column names to be searched. Accepts 'ID', 'login',
+	 *                                             'nicename', 'email', 'url'. Default empty array.
+	 *     @type string|array $orderby             Field(s) to sort the retrieved users by. May be a single value,
+	 *                                             an array of values, or a multi-dimensional array with fields as
+	 *                                             keys and orders ('ASC' or 'DESC') as values. Accepted values are
+	 *                                             'ID', 'display_name' (or 'name'), 'include', 'user_login'
+	 *                                             (or 'login'), 'login__in', 'user_nicename' (or 'nicename'),
+	 *                                             'nicename__in', 'user_email (or 'email'), 'user_url' (or 'url'),
+	 *                                             'user_registered' (or 'registered'), 'post_count', 'meta_value',
+	 *                                             'meta_value_num', the value of `$meta_key`, or an array key of
+	 *                                             `$meta_query`. To use 'meta_value' or 'meta_value_num', `$meta_key`
+	 *                                             must be also be defined. Default 'user_login'.
+	 *     @type string       $order               Designates ascending or descending order of users. Order values
+	 *                                             passed as part of an `$orderby` array take precedence over this
+	 *                                             parameter. Accepts 'ASC', 'DESC'. Default 'ASC'.
+	 *     @type int          $offset              Number of users to offset in retrieved results. Can be used in
+	 *                                             conjunction with pagination. Default 0.
+	 *     @type int          $number              Number of users to limit the query for. Can be used in
+	 *                                             conjunction with pagination. Value -1 (all) is supported, but
+	 *                                             should be used with caution on larger sites.
+	 *                                             Default empty (all users).
+	 *     @type int          $paged               When used with number, defines the page of results to return.
+	 *                                             Default 1.
+	 *     @type bool         $count_total         Whether to count the total number of users found. If pagination
+	 *                                             is not needed, setting this to false can improve performance.
+	 *                                             Default true.
+	 *     @type string|array $fields              Which fields to return. Single or all fields (string), or array
+	 *                                             of fields. Accepts 'ID', 'display_name', 'user_login',
+	 *                                             'user_nicename', 'user_email', 'user_url', 'user_registered'.
+	 *                                             Use 'all' for all fields and 'all_with_meta' to include
+	 *                                             meta fields. Default 'all'.
+	 *     @type string       $who                 Type of users to query. Accepts 'authors'.
+	 *                                             Default empty (all users).
+	 *     @type bool|array   $has_published_posts Pass an array of post types to filter results to users who have
+	 *                                             published posts in those post types. `true` is an alias for all
+	 *                                             public post types.
+	 *     @type string       $nicename            The user nicename. Default empty.
+	 *     @type array        $nicename__in        An array of nicenames to include. Users matching one of these
+	 *                                             nicenames will be included in results. Default empty array.
+	 *     @type array        $nicename__not_in    An array of nicenames to exclude. Users matching one of these
+	 *                                             nicenames will not be included in results. Default empty array.
+	 *     @type string       $login               The user login. Default empty.
+	 *     @type array        $login__in           An array of logins to include. Users matching one of these
+	 *                                             logins will be included in results. Default empty array.
+	 *     @type array        $login__not_in       An array of logins to exclude. Users matching one of these
+	 *                                             logins will not be included in results. Default empty array.
+	 * }
+	 */
+	public function prepare_query( $query = array() ) {
+		global $wpdb;
+
+		if ( empty( $this->query_vars ) || ! empty( $query ) ) {
+			$this->query_limit = null;
+			$this->query_vars = $this->fill_query_vars( $query );
+		}
+
+		/**
+		 * Fires before the WP_User_Query has been parsed.
+		 *
+		 * The passed WP_User_Query object contains the query variables, not
+		 * yet passed into SQL.
+		 *
+		 * @since 4.0.0
+		 *
+		 * @param WP_User_Query $this The current WP_User_Query instance,
+		 *                            passed by reference.
+		 */
+		do_action( 'pre_get_users', $this );
+
+		// Ensure that query vars are filled after 'pre_get_users'.
+		$qv =& $this->query_vars;
+		$qv =  $this->fill_query_vars( $qv );
+
+		if ( is_array( $qv['fields'] ) ) {
+			$qv['fields'] = array_unique( $qv['fields'] );
+
+			$this->query_fields = array();
+			foreach ( $qv['fields'] as $field ) {
+				$field = 'ID' === $field ? 'ID' : sanitize_key( $field );
+				$this->query_fields[] = "$wpdb->users.$field";
+			}
+			$this->query_fields = implode( ',', $this->query_fields );
+		} elseif ( 'all' == $qv['fields'] ) {
+			$this->query_fields = "$wpdb->users.*";
+		} else {
+			$this->query_fields = "$wpdb->users.ID";
+		}
+
+		if ( isset( $qv['count_total'] ) && $qv['count_total'] )
+			$this->query_fields = 'SQL_CALC_FOUND_ROWS ' . $this->query_fields;
+
+		$this->query_from = "FROM $wpdb->users";
+		$this->query_where = "WHERE 1=1";
+
+		// Parse and sanitize 'include', for use by 'orderby' as well as 'include' below.
+		if ( ! empty( $qv['include'] ) ) {
+			$include = wp_parse_id_list( $qv['include'] );
+		} else {
+			$include = false;
+		}
+
+		$blog_id = 0;
+		if ( isset( $qv['blog_id'] ) ) {
+			$blog_id = absint( $qv['blog_id'] );
+		}
+
+		if ( $qv['has_published_posts'] && $blog_id ) {
+			if ( true === $qv['has_published_posts'] ) {
+				$post_types = get_post_types( array( 'public' => true ) );
+			} else {
+				$post_types = (array) $qv['has_published_posts'];
+			}
+
+			foreach ( $post_types as &$post_type ) {
+				$post_type = $wpdb->prepare( '%s', $post_type );
+			}
+
+			$posts_table = $wpdb->get_blog_prefix( $blog_id ) . 'posts';
+			$this->query_where .= " AND $wpdb->users.ID IN ( SELECT DISTINCT $posts_table.post_author FROM $posts_table WHERE $posts_table.post_status = 'publish' AND $posts_table.post_type IN ( " . join( ", ", $post_types ) . " ) )";
+		}
+
+		// nicename
+		if ( '' !== $qv['nicename']) {
+			$this->query_where .= $wpdb->prepare( ' AND user_nicename = %s', $qv['nicename'] );
+		}
+
+		if ( ! empty( $qv['nicename__in'] ) ) {
+			$sanitized_nicename__in = array_map( 'esc_sql', $qv['nicename__in'] );
+			$nicename__in = implode( "','", $sanitized_nicename__in );
+			$this->query_where .= " AND user_nicename IN ( '$nicename__in' )";
+		}
+
+		if ( ! empty( $qv['nicename__not_in'] ) ) {
+			$sanitized_nicename__not_in = array_map( 'esc_sql', $qv['nicename__not_in'] );
+			$nicename__not_in = implode( "','", $sanitized_nicename__not_in );
+			$this->query_where .= " AND user_nicename NOT IN ( '$nicename__not_in' )";
+		}
+
+		// login
+		if ( '' !== $qv['login']) {
+			$this->query_where .= $wpdb->prepare( ' AND user_login = %s', $qv['login'] );
+		}
+
+		if ( ! empty( $qv['login__in'] ) ) {
+			$sanitized_login__in = array_map( 'esc_sql', $qv['login__in'] );
+			$login__in = implode( "','", $sanitized_login__in );
+			$this->query_where .= " AND user_login IN ( '$login__in' )";
+		}
+
+		if ( ! empty( $qv['login__not_in'] ) ) {
+			$sanitized_login__not_in = array_map( 'esc_sql', $qv['login__not_in'] );
+			$login__not_in = implode( "','", $sanitized_login__not_in );
+			$this->query_where .= " AND user_login NOT IN ( '$login__not_in' )";
+		}
+
+		// Meta query.
+		$this->meta_query = new WP_Meta_Query();
+		$this->meta_query->parse_query_vars( $qv );
+
+		if ( isset( $qv['who'] ) && 'authors' == $qv['who'] && $blog_id ) {
+			$who_query = array(
+				'key' => $wpdb->get_blog_prefix( $blog_id ) . 'user_level',
+				'value' => 0,
+				'compare' => '!=',
+			);
+
+			// Prevent extra meta query.
+			$qv['blog_id'] = $blog_id = 0;
+
+			if ( empty( $this->meta_query->queries ) ) {
+				$this->meta_query->queries = array( $who_query );
+			} else {
+				// Append the cap query to the original queries and reparse the query.
+				$this->meta_query->queries = array(
+					'relation' => 'AND',
+					array( $this->meta_query->queries, $who_query ),
+				);
+			}
+
+			$this->meta_query->parse_query_vars( $this->meta_query->queries );
+		}
+
+		$roles = array();
+		if ( isset( $qv['role'] ) ) {
+			if ( is_array( $qv['role'] ) ) {
+				$roles = $qv['role'];
+			} elseif ( is_string( $qv['role'] ) && ! empty( $qv['role'] ) ) {
+				$roles = array_map( 'trim', explode( ',', $qv['role'] ) );
+			}
+		}
+
+		$role__in = array();
+		if ( isset( $qv['role__in'] ) ) {
+			$role__in = (array) $qv['role__in'];
+		}
+
+		$role__not_in = array();
+		if ( isset( $qv['role__not_in'] ) ) {
+			$role__not_in = (array) $qv['role__not_in'];
+		}
+
+		if ( $blog_id && ( ! empty( $roles ) || ! empty( $role__in ) || ! empty( $role__not_in ) || is_multisite() ) ) {
+			$role_queries  = array();
+
+			$roles_clauses = array( 'relation' => 'AND' );
+			if ( ! empty( $roles ) ) {
+				foreach ( $roles as $role ) {
+					$roles_clauses[] = array(
+						'key'     => $wpdb->get_blog_prefix( $blog_id ) . 'capabilities',
+						'value'   => '"' . $role . '"',
+						'compare' => 'LIKE',
+					);
+				}
+
+				$role_queries[] = $roles_clauses;
+			}
+
+			$role__in_clauses = array( 'relation' => 'OR' );
+			if ( ! empty( $role__in ) ) {
+				foreach ( $role__in as $role ) {
+					$role__in_clauses[] = array(
+						'key'     => $wpdb->get_blog_prefix( $blog_id ) . 'capabilities',
+						'value'   => '"' . $role . '"',
+						'compare' => 'LIKE',
+					);
+				}
+
+				$role_queries[] = $role__in_clauses;
+			}
+
+			$role__not_in_clauses = array( 'relation' => 'AND' );
+			if ( ! empty( $role__not_in ) ) {
+				foreach ( $role__not_in as $role ) {
+					$role__not_in_clauses[] = array(
+						'key'     => $wpdb->get_blog_prefix( $blog_id ) . 'capabilities',
+						'value'   => '"' . $role . '"',
+						'compare' => 'NOT LIKE',
+					);
+				}
+
+				$role_queries[] = $role__not_in_clauses;
+			}
+
+			// If there are no specific roles named, make sure the user is a member of the site.
+			if ( empty( $role_queries ) ) {
+				$role_queries[] = array(
+					'key' => $wpdb->get_blog_prefix( $blog_id ) . 'capabilities',
+					'compare' => 'EXISTS',
+				);
+			}
+
+			// Specify that role queries should be joined with AND.
+			$role_queries['relation'] = 'AND';
+
+			if ( empty( $this->meta_query->queries ) ) {
+				$this->meta_query->queries = $role_queries;
+			} else {
+				// Append the cap query to the original queries and reparse the query.
+				$this->meta_query->queries = array(
+					'relation' => 'AND',
+					array( $this->meta_query->queries, $role_queries ),
+				);
+			}
+
+			$this->meta_query->parse_query_vars( $this->meta_query->queries );
+		}
+
+		if ( ! empty( $this->meta_query->queries ) ) {
+			$clauses = $this->meta_query->get_sql( 'user', $wpdb->users, 'ID', $this );
+			$this->query_from .= $clauses['join'];
+			$this->query_where .= $clauses['where'];
+
+			if ( $this->meta_query->has_or_relation() ) {
+				$this->query_fields = 'DISTINCT ' . $this->query_fields;
+			}
+		}
+
+		// sorting
+		$qv['order'] = isset( $qv['order'] ) ? strtoupper( $qv['order'] ) : '';
+		$order = $this->parse_order( $qv['order'] );
+
+		if ( empty( $qv['orderby'] ) ) {
+			// Default order is by 'user_login'.
+			$ordersby = array( 'user_login' => $order );
+		} elseif ( is_array( $qv['orderby'] ) ) {
+			$ordersby = $qv['orderby'];
+		} else {
+			// 'orderby' values may be a comma- or space-separated list.
+			$ordersby = preg_split( '/[,\s]+/', $qv['orderby'] );
+		}
+
+		$orderby_array = array();
+		foreach ( $ordersby as $_key => $_value ) {
+			if ( ! $_value ) {
+				continue;
+			}
+
+			if ( is_int( $_key ) ) {
+				// Integer key means this is a flat array of 'orderby' fields.
+				$_orderby = $_value;
+				$_order = $order;
+			} else {
+				// Non-integer key means this the key is the field and the value is ASC/DESC.
+				$_orderby = $_key;
+				$_order = $_value;
+			}
+
+			$parsed = $this->parse_orderby( $_orderby );
+
+			if ( ! $parsed ) {
+				continue;
+			}
+
+			if ( 'nicename__in' === $_orderby || 'login__in' === $_orderby ) {
+				$orderby_array[] = $parsed;
+			} else {
+				$orderby_array[] = $parsed . ' ' . $this->parse_order( $_order );
+			}
+		}
+
+		// If no valid clauses were found, order by user_login.
+		if ( empty( $orderby_array ) ) {
+			$orderby_array[] = "user_login $order";
+		}
+
+		$this->query_orderby = 'ORDER BY ' . implode( ', ', $orderby_array );
+
+		// limit
+		if ( isset( $qv['number'] ) && $qv['number'] > 0 ) {
+			if ( $qv['offset'] ) {
+				$this->query_limit = $wpdb->prepare("LIMIT %d, %d", $qv['offset'], $qv['number']);
+			} else {
+				$this->query_limit = $wpdb->prepare( "LIMIT %d, %d", $qv['number'] * ( $qv['paged'] - 1 ), $qv['number'] );
+			}
+		}
+
+		$search = '';
+		if ( isset( $qv['search'] ) )
+			$search = trim( $qv['search'] );
+
+		if ( $search ) {
+			$leading_wild = ( ltrim($search, '*') != $search );
+			$trailing_wild = ( rtrim($search, '*') != $search );
+			if ( $leading_wild && $trailing_wild )
+				$wild = 'both';
+			elseif ( $leading_wild )
+				$wild = 'leading';
+			elseif ( $trailing_wild )
+				$wild = 'trailing';
+			else
+				$wild = false;
+			if ( $wild )
+				$search = trim($search, '*');
+
+			$search_columns = array();
+			if ( $qv['search_columns'] ) {
+				$search_columns = array_intersect( $qv['search_columns'], array( 'ID', 'user_login', 'user_email', 'user_url', 'user_nicename', 'display_name' ) );
+			}
+			if ( ! $search_columns ) {
+				if ( false !== strpos( $search, '@') )
+					$search_columns = array('user_email');
+				elseif ( is_numeric($search) )
+					$search_columns = array('user_login', 'ID');
+				elseif ( preg_match('|^https?://|', $search) && ! ( is_multisite() && wp_is_large_network( 'users' ) ) )
+					$search_columns = array('user_url');
+				else
+					$search_columns = array('user_login', 'user_url', 'user_email', 'user_nicename', 'display_name');
+			}
+
+			/**
+			 * Filters the columns to search in a WP_User_Query search.
+			 *
+			 * The default columns depend on the search term, and include 'user_email',
+			 * 'user_login', 'ID', 'user_url', 'display_name', and 'user_nicename'.
+			 *
+			 * @since 3.6.0
+			 *
+			 * @param array         $search_columns Array of column names to be searched.
+			 * @param string        $search         Text being searched.
+			 * @param WP_User_Query $this           The current WP_User_Query instance.
+			 */
+			$search_columns = apply_filters( 'user_search_columns', $search_columns, $search, $this );
+
+			$this->query_where .= $this->get_search_sql( $search, $search_columns, $wild );
+		}
+
+		if ( ! empty( $include ) ) {
+			// Sanitized earlier.
+			$ids = implode( ',', $include );
+			$this->query_where .= " AND $wpdb->users.ID IN ($ids)";
+		} elseif ( ! empty( $qv['exclude'] ) ) {
+			$ids = implode( ',', wp_parse_id_list( $qv['exclude'] ) );
+			$this->query_where .= " AND $wpdb->users.ID NOT IN ($ids)";
+		}
+
+		// Date queries are allowed for the user_registered field.
+		if ( ! empty( $qv['date_query'] ) && is_array( $qv['date_query'] ) ) {
+			$date_query = new WP_Date_Query( $qv['date_query'], 'user_registered' );
+			$this->query_where .= $date_query->get_sql();
+		}
+
+		/**
+		 * Fires after the WP_User_Query has been parsed, and before
+		 * the query is executed.
+		 *
+		 * The passed WP_User_Query object contains SQL parts formed
+		 * from parsing the given query.
+		 *
+		 * @since 3.1.0
+		 *
+		 * @param WP_User_Query $this The current WP_User_Query instance,
+		 *                            passed by reference.
+		 */
+		do_action_ref_array( 'pre_user_query', array( &$this ) );
+	}
+
+	/**
+	 * Execute the query, with the current variables.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 */
+	public function query() {
+		global $wpdb;
+
+		$qv =& $this->query_vars;
+
+		$this->request = "SELECT $this->query_fields $this->query_from $this->query_where $this->query_orderby $this->query_limit";
+
+		if ( is_array( $qv['fields'] ) || 'all' == $qv['fields'] ) {
+			$this->results = $wpdb->get_results( $this->request );
+		} else {
+			$this->results = $wpdb->get_col( $this->request );
+		}
+
+		/**
+		 * Filters SELECT FOUND_ROWS() query for the current WP_User_Query instance.
+		 *
+		 * @since 3.2.0
+		 *
+		 * @global wpdb $wpdb WordPress database abstraction object.
+		 *
+		 * @param string $sql The SELECT FOUND_ROWS() query for the current WP_User_Query.
+		 */
+		if ( isset( $qv['count_total'] ) && $qv['count_total'] )
+			$this->total_users = (int) $wpdb->get_var( apply_filters( 'found_users_query', 'SELECT FOUND_ROWS()' ) );
+
+		if ( !$this->results )
+			return;
+
+		if ( 'all_with_meta' == $qv['fields'] ) {
+			cache_users( $this->results );
+
+			$r = array();
+			foreach ( $this->results as $userid )
+				$r[ $userid ] = new WP_User( $userid, '', $qv['blog_id'] );
+
+			$this->results = $r;
+		} elseif ( 'all' == $qv['fields'] ) {
+			foreach ( $this->results as $key => $user ) {
+				$this->results[ $key ] = new WP_User( $user, '', $qv['blog_id'] );
+			}
+		}
+	}
+
+	/**
+	 * Retrieve query variable.
+	 *
+	 * @since 3.5.0
+	 *
+	 * @param string $query_var Query variable key.
+	 * @return mixed
+	 */
+	public function get( $query_var ) {
+		if ( isset( $this->query_vars[$query_var] ) )
+			return $this->query_vars[$query_var];
+
+		return null;
+	}
+
+	/**
+	 * Set query variable.
+	 *
+	 * @since 3.5.0
+	 *
+	 * @param string $query_var Query variable key.
+	 * @param mixed $value Query variable value.
+	 */
+	public function set( $query_var, $value ) {
+		$this->query_vars[$query_var] = $value;
+	}
+
+	/**
+	 * Used internally to generate an SQL string for searching across multiple columns
+	 *
+	 * @since 3.1.0
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 *
+	 * @param string $string
+	 * @param array  $cols
+	 * @param bool   $wild   Whether to allow wildcard searches. Default is false for Network Admin, true for single site.
+	 *                       Single site allows leading and trailing wildcards, Network Admin only trailing.
+	 * @return string
+	 */
+	protected function get_search_sql( $string, $cols, $wild = false ) {
+		global $wpdb;
+
+		$searches = array();
+		$leading_wild = ( 'leading' == $wild || 'both' == $wild ) ? '%' : '';
+		$trailing_wild = ( 'trailing' == $wild || 'both' == $wild ) ? '%' : '';
+		$like = $leading_wild . $wpdb->esc_like( $string ) . $trailing_wild;
+
+		foreach ( $cols as $col ) {
+			if ( 'ID' == $col ) {
+				$searches[] = $wpdb->prepare( "$col = %s", $string );
+			} else {
+				$searches[] = $wpdb->prepare( "$col LIKE %s", $like );
+			}
+		}
+
+		return ' AND (' . implode(' OR ', $searches) . ')';
+	}
+
+	/**
+	 * Return the list of users.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return array Array of results.
+	 */
+	public function get_results() {
+		return $this->results;
+	}
+
+	/**
+	 * Return the total number of users for the current query.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return int Number of total users.
+	 */
+	public function get_total() {
+		return $this->total_users;
+	}
+
+	/**
+	 * Parse and sanitize 'orderby' keys passed to the user query.
+	 *
+	 * @since 4.2.0
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 *
+	 * @param string $orderby Alias for the field to order by.
+	 * @return string Value to used in the ORDER clause, if `$orderby` is valid.
+	 */
+	protected function parse_orderby( $orderby ) {
+		global $wpdb;
+
+		$meta_query_clauses = $this->meta_query->get_clauses();
+
+		$_orderby = '';
+		if ( in_array( $orderby, array( 'login', 'nicename', 'email', 'url', 'registered' ) ) ) {
+			$_orderby = 'user_' . $orderby;
+		} elseif ( in_array( $orderby, array( 'user_login', 'user_nicename', 'user_email', 'user_url', 'user_registered' ) ) ) {
+			$_orderby = $orderby;
+		} elseif ( 'name' == $orderby || 'display_name' == $orderby ) {
+			$_orderby = 'display_name';
+		} elseif ( 'post_count' == $orderby ) {
+			// todo: avoid the JOIN
+			$where = get_posts_by_author_sql( 'post' );
+			$this->query_from .= " LEFT OUTER JOIN (
+				SELECT post_author, COUNT(*) as post_count
+				FROM $wpdb->posts
+				$where
+				GROUP BY post_author
+			) p ON ({$wpdb->users}.ID = p.post_author)
+			";
+			$_orderby = 'post_count';
+		} elseif ( 'ID' == $orderby || 'id' == $orderby ) {
+			$_orderby = 'ID';
+		} elseif ( 'meta_value' == $orderby || $this->get( 'meta_key' ) == $orderby ) {
+			$_orderby = "$wpdb->usermeta.meta_value";
+		} elseif ( 'meta_value_num' == $orderby ) {
+			$_orderby = "$wpdb->usermeta.meta_value+0";
+		} elseif ( 'include' === $orderby && ! empty( $this->query_vars['include'] ) ) {
+			$include = wp_parse_id_list( $this->query_vars['include'] );
+			$include_sql = implode( ',', $include );
+			$_orderby = "FIELD( $wpdb->users.ID, $include_sql )";
+		} elseif ( 'nicename__in' === $orderby ) {
+			$sanitized_nicename__in = array_map( 'esc_sql', $this->query_vars['nicename__in'] );
+			$nicename__in = implode( "','", $sanitized_nicename__in );
+			$_orderby = "FIELD( user_nicename, '$nicename__in' )";
+		} elseif ( 'login__in' === $orderby ) {
+			$sanitized_login__in = array_map( 'esc_sql', $this->query_vars['login__in'] );
+			$login__in = implode( "','", $sanitized_login__in );
+			$_orderby = "FIELD( user_login, '$login__in' )";
+		} elseif ( isset( $meta_query_clauses[ $orderby ] ) ) {
+			$meta_clause = $meta_query_clauses[ $orderby ];
+			$_orderby = sprintf( "CAST(%s.meta_value AS %s)", esc_sql( $meta_clause['alias'] ), esc_sql( $meta_clause['cast'] ) );
+		}
+
+		return $_orderby;
+	}
+
+	/**
+	 * Parse an 'order' query variable and cast it to ASC or DESC as necessary.
+	 *
+	 * @since 4.2.0
+	 *
+	 * @param string $order The 'order' query variable.
+	 * @return string The sanitized 'order' query variable.
+	 */
+	protected function parse_order( $order ) {
+		if ( ! is_string( $order ) || empty( $order ) ) {
+			return 'DESC';
+		}
+
+		if ( 'ASC' === strtoupper( $order ) ) {
+			return 'ASC';
+		} else {
+			return 'DESC';
+		}
+	}
+
+	/**
+	 * Make private properties readable for backward compatibility.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $name Property to get.
+	 * @return mixed Property.
+	 */
+	public function __get( $name ) {
+		if ( in_array( $name, $this->compat_fields ) ) {
+			return $this->$name;
+		}
+	}
+
+	/**
+	 * Make private properties settable for backward compatibility.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $name  Property to check if set.
+	 * @param mixed  $value Property value.
+	 * @return mixed Newly-set property.
+	 */
+	public function __set( $name, $value ) {
+		if ( in_array( $name, $this->compat_fields ) ) {
+			return $this->$name = $value;
+		}
+	}
+
+	/**
+	 * Make private properties checkable for backward compatibility.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $name Property to check if set.
+	 * @return bool Whether the property is set.
+	 */
+	public function __isset( $name ) {
+		if ( in_array( $name, $this->compat_fields ) ) {
+			return isset( $this->$name );
+		}
+	}
+
+	/**
+	 * Make private properties un-settable for backward compatibility.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $name Property to unset.
+	 */
+	public function __unset( $name ) {
+		if ( in_array( $name, $this->compat_fields ) ) {
+			unset( $this->$name );
+		}
+	}
+
+	/**
+	 * Make private/protected methods readable for backward compatibility.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param callable $name      Method to call.
+	 * @param array    $arguments Arguments to pass when calling.
+	 * @return mixed Return value of the callback, false otherwise.
+	 */
+	public function __call( $name, $arguments ) {
+		if ( 'get_search_sql' === $name ) {
+			return call_user_func_array( array( $this, $name ), $arguments );
+		}
+		return false;
+	}
+}