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EDIT :: class-wp-user-query.php

<?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.
 */
#[AllowDynamicProperties]
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;

/**
	 * Constructor.
	 *
	 * @since 3.1.0
	 *
	 * @param null|string|array $query Optional. The query variables.
	 *                                 See WP_User_Query::prepare_query() for information on accepted arguments.
	 */
	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 string|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(),
			'capability'          => '',
			'capability__in'      => array(),
			'capability__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(),
			'cache_results'       => true,
		);

return wp_parse_args( $args, $defaults );
	}

/**
	 * Prepares 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.
	 * @since 5.1.0 Introduced the 'meta_compare_key' parameter.
	 * @since 5.3.0 Introduced the 'meta_type_key' parameter.
	 * @since 5.9.0 Added 'capability', 'capability__in', and 'capability__not_in' parameters.
	 *              Deprecated the 'who' parameter.
	 * @since 6.3.0 Added 'cache_results' parameter.
	 *
	 * @global wpdb     $wpdb     WordPress database abstraction object.
	 * @global WP_Roles $wp_roles WordPress role management object.
	 *
	 * @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|string[] $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 string[]        $role__in            An array of role names. Matched users must have at least one
	 *                                                of these roles. Default empty array.
	 *     @type string[]        $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|string[] $meta_key            Meta key or keys to filter by.
	 *     @type string|string[] $meta_value          Meta value or values to filter by.
	 *     @type string          $meta_compare        MySQL operator used for comparing the meta value.
	 *                                                See WP_Meta_Query::__construct() for accepted values and default value.
	 *     @type string          $meta_compare_key    MySQL operator used for comparing the meta key.
	 *                                                See WP_Meta_Query::__construct() for accepted values and default value.
	 *     @type string          $meta_type           MySQL data type that the meta_value column will be CAST to for comparisons.
	 *                                                See WP_Meta_Query::__construct() for accepted values and default value.
	 *     @type string          $meta_type_key       MySQL data type that the meta_key column will be CAST to for comparisons.
	 *                                                See WP_Meta_Query::__construct() for accepted values and default value.
	 *     @type array           $meta_query          An associative array of WP_Meta_Query arguments.
	 *                                                See WP_Meta_Query::__construct() for accepted values.
	 *     @type string|string[] $capability          An array or a comma-separated list of capability names that users
	 *                                                must match to be included in results. Note that this is
	 *                                                an inclusive list: users must match *each* capability.
	 *                                                Does NOT work for capabilities not in the database or filtered
	 *                                                via {@see 'map_meta_cap'}. Default empty.
	 *     @type string[]        $capability__in      An array of capability names. Matched users must have at least one
	 *                                                of these capabilities.
	 *                                                Does NOT work for capabilities not in the database or filtered
	 *                                                via {@see 'map_meta_cap'}. Default empty array.
	 *     @type string[]        $capability__not_in  An array of capability names to exclude. Users matching one or more
	 *                                                of these capabilities will not be included in results.
	 *                                                Does NOT work for capabilities not in the database or filtered
	 *                                                via {@see 'map_meta_cap'}. Default empty array.
	 *     @type int[]           $include             An array of user IDs to include. Default empty array.
	 *     @type int[]           $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 string[]        $search_columns      Array of column names to be searched. Accepts 'ID', 'user_login',
	 *                                                'user_email', 'user_url', 'user_nicename', 'display_name'.
	 *                                                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`
	 *                                                - 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 -1 (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|string[] $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'
	 *                                                - 'user_pass'
	 *                                                - 'user_activation_key'
	 *                                                - 'user_status'
	 *                                                - 'spam' (only available on multisite installs)
	 *                                                - 'deleted' (only available on multisite installs)
	 *                                                - 'all' for all fields and loads user meta.
	 *                                                - 'all_with_meta' Deprecated. Use 'all'.
	 *                                                Default 'all'.
	 *     @type string          $who                 Deprecated, use `$capability` instead.
	 *                                                Type of users to query. Accepts 'authors'.
	 *                                                Default empty (all users).
	 *     @type bool|string[]   $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 string[]        $nicename__in        An array of nicenames to include. Users matching one of these
	 *                                                nicenames will be included in results. Default empty array.
	 *     @type string[]        $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 string[]        $login__in           An array of logins to include. Users matching one of these
	 *                                                logins will be included in results. Default empty array.
	 *     @type string[]        $login__not_in       An array of logins to exclude. Users matching one of these
	 *                                                logins will not be included in results. Default empty array.
	 *     @type bool            $cache_results       Whether to cache user information. Default true.
	 * }
	 */
	public function prepare_query( $query = array() ) {
		global $wpdb, $wp_roles;

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 $query Current instance of WP_User_Query (passed by reference).
		 */
		do_action_ref_array( 'pre_get_users', array( &$this ) );

// Ensure that query vars are filled after 'pre_get_users'.
		$qv =& $this->query_vars;
		$qv = $this->fill_query_vars( $qv );

$allowed_fields = array(
			'id',
			'user_login',
			'user_pass',
			'user_nicename',
			'user_email',
			'user_url',
			'user_registered',
			'user_activation_key',
			'user_status',
			'display_name',
		);
		if ( is_multisite() ) {
			$allowed_fields[] = 'spam';
			$allowed_fields[] = 'deleted';
		}

if ( is_array( $qv['fields'] ) ) {
			$qv['fields'] = array_map( 'strtolower', $qv['fields'] );
			$qv['fields'] = array_intersect( array_unique( $qv['fields'] ), $allowed_fields );

if ( empty( $qv['fields'] ) ) {
				$qv['fields'] = array( 'id' );
			}

$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_with_meta' === $qv['fields'] || 'all' === $qv['fields'] || ! in_array( $qv['fields'], $allowed_fields, true ) ) {
			$this->query_fields = "$wpdb->users.ID";
		} else {
			$field              = 'id' === strtolower( $qv['fields'] ) ? 'ID' : sanitize_key( $qv['fields'] );
			$this->query_fields = "$wpdb->users.$field";
		}

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 ( " . implode( ', ', $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'] && $blog_id ) {
			_deprecated_argument(
				'WP_User_Query',
				'5.9.0',
				sprintf(
					/* translators: 1: who, 2: capability */
					__( '%1$s is deprecated. Use %2$s instead.' ),
					'<code>who</code>',
					'<code>capability</code>'
				)
			);

$who_query = array(
				'key'     => $wpdb->get_blog_prefix( $blog_id ) . 'user_level',
				'value'   => 0,
				'compare' => '!=',
			);

// Prevent extra meta query.
			$qv['blog_id'] = 0;
			$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.
		$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'];
		}

// Capabilities.
		$available_roles = array();

if ( ! empty( $qv['capability'] ) || ! empty( $qv['capability__in'] ) || ! empty( $qv['capability__not_in'] ) ) {
			$wp_roles->for_site( $blog_id );
			$available_roles = $wp_roles->roles;
		}

$capabilities = array();
		if ( ! empty( $qv['capability'] ) ) {
			if ( is_array( $qv['capability'] ) ) {
				$capabilities = $qv['capability'];
			} elseif ( is_string( $qv['capability'] ) ) {
				$capabilities = array_map( 'trim', explode( ',', $qv['capability'] ) );
			}
		}

$capability__in = array();
		if ( ! empty( $qv['capability__in'] ) ) {
			$capability__in = (array) $qv['capability__in'];
		}

$capability__not_in = array();
		if ( ! empty( $qv['capability__not_in'] ) ) {
			$capability__not_in = (array) $qv['capability__not_in'];
		}

// Keep track of all capabilities and the roles they're added on.
		$caps_with_roles = array();

foreach ( $available_roles as $role => $role_data ) {
			$role_caps = array_keys( array_filter( $role_data['capabilities'] ) );

foreach ( $capabilities as $cap ) {
				if ( in_array( $cap, $role_caps, true ) ) {
					$caps_with_roles[ $cap ][] = $role;
					break;
				}
			}

foreach ( $capability__in as $cap ) {
				if ( in_array( $cap, $role_caps, true ) ) {
					$role__in[] = $role;
					break;
				}
			}

foreach ( $capability__not_in as $cap ) {
				if ( in_array( $cap, $role_caps, true ) ) {
					$role__not_in[] = $role;
					break;
				}
			}
		}

$role__in     = array_merge( $role__in, $capability__in );
		$role__not_in = array_merge( $role__not_in, $capability__not_in );

$roles        = array_unique( $roles );
		$role__in     = array_unique( $role__in );
		$role__not_in = array_unique( $role__not_in );

// Support querying by capabilities added directly to users.
		if ( $blog_id && ! empty( $capabilities ) ) {
			$capabilities_clauses = array( 'relation' => 'AND' );

foreach ( $capabilities as $cap ) {
				$clause = array( 'relation' => 'OR' );

$clause[] = array(
					'key'     => $wpdb->get_blog_prefix( $blog_id ) . 'capabilities',
					'value'   => '"' . $cap . '"',
					'compare' => 'LIKE',
				);

if ( ! empty( $caps_with_roles[ $cap ] ) ) {
					foreach ( $caps_with_roles[ $cap ] as $role ) {
						$clause[] = array(
							'key'     => $wpdb->get_blog_prefix( $blog_id ) . 'capabilities',
							'value'   => '"' . $role . '"',
							'compare' => 'LIKE',
						);
					}
				}

$capabilities_clauses[] = $clause;
			}

$role_queries[] = $capabilities_clauses;

if ( empty( $this->meta_query->queries ) ) {
				$this->meta_query->queries[] = $capabilities_clauses;
			} 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, array( $capabilities_clauses ) ),
				);
			}

$this->meta_query->parse_query_vars( $this->meta_query->queries );
		}

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 ( str_contains( $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 'ID', 'user_login',
			 * 'user_email', 'user_url', 'user_nicename', and 'display_name'.
			 *
			 * @since 3.6.0
			 *
			 * @param string[]      $search_columns Array of column names to be searched.
			 * @param string        $search         Text being searched.
			 * @param WP_User_Query $query          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 $query Current instance of WP_User_Query (passed by reference).
		 */
		do_action_ref_array( 'pre_user_query', array( &$this ) );
	}

/**
	 * Executes the query, with the current variables.
	 *
	 * @since 3.1.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 */
	public function query() {
		global $wpdb;

if ( ! did_action( 'plugins_loaded' ) ) {
			_doing_it_wrong(
				'WP_User_Query::query',
				sprintf(
				/* translators: %s: plugins_loaded */
					__( 'User queries should not be run before the %s hook.' ),
					'<code>plugins_loaded</code>'
				),
				'6.1.1'
			);
		}

$qv =& $this->query_vars;

// Do not cache results if more than 3 fields are requested.
		if ( is_array( $qv['fields'] ) && count( $qv['fields'] ) > 3 ) {
			$qv['cache_results'] = false;
		}

/**
		 * Filters the users array before the query takes place.
		 *
		 * Return a non-null value to bypass WordPress' default user queries.
		 *
		 * Filtering functions that require pagination information are encouraged to set
		 * the `total_users` property of the WP_User_Query object, passed to the filter
		 * by reference. If WP_User_Query does not perform a database query, it will not
		 * have enough information to generate these values itself.
		 *
		 * @since 5.1.0
		 *
		 * @param array|null    $results Return an array of user data to short-circuit WP's user query
		 *                               or null to allow WP to run its normal queries.
		 * @param WP_User_Query $query   The WP_User_Query instance (passed by reference).
		 */
		$this->results = apply_filters_ref_array( 'users_pre_query', array( null, &$this ) );

if ( null === $this->results ) {
			// Beginning of the string is on a new line to prevent leading whitespace. See https://core.trac.wordpress.org/ticket/56841.
			$this->request =
				"SELECT {$this->query_fields}
				 {$this->query_from}
				 {$this->query_where}
				 {$this->query_orderby}
				 {$this->query_limit}";
			$cache_value   = false;
			$cache_key     = $this->generate_cache_key( $qv, $this->request );
			$cache_group   = 'user-queries';
			if ( $qv['cache_results'] ) {
				$cache_value = wp_cache_get( $cache_key, $cache_group );
			}
			if ( false !== $cache_value ) {
				$this->results     = $cache_value['user_data'];
				$this->total_users = $cache_value['total_users'];
			} else {

if ( is_array( $qv['fields'] ) ) {
					$this->results = $wpdb->get_results( $this->request );
				} else {
					$this->results = $wpdb->get_col( $this->request );
				}

if ( isset( $qv['count_total'] ) && $qv['count_total'] ) {
					/**
					 * Filters SELECT FOUND_ROWS() query for the current WP_User_Query instance.
					 *
					 * @since 3.2.0
					 * @since 5.1.0 Added the `$this` parameter.
					 *
					 * @global wpdb $wpdb WordPress database abstraction object.
					 *
					 * @param string        $sql   The SELECT FOUND_ROWS() query for the current WP_User_Query.
					 * @param WP_User_Query $query The current WP_User_Query instance.
					 */
					$found_users_query = apply_filters( 'found_users_query', 'SELECT FOUND_ROWS()', $this );

$this->total_users = (int) $wpdb->get_var( $found_users_query );
				}

if ( $qv['cache_results'] ) {
					$cache_value = array(
						'user_data'   => $this->results,
						'total_users' => $this->total_users,
					);
					wp_cache_add( $cache_key, $cache_value, $cache_group );
				}
			}
		}

if ( ! $this->results ) {
			return;
		}
		if (
			is_array( $qv['fields'] ) &&
			isset( $this->results[0]->ID )
		) {
			foreach ( $this->results as $result ) {
				$result->id = $result->ID;
			}
		} elseif ( 'all_with_meta' === $qv['fields'] || 'all' === $qv['fields'] ) {
			if ( function_exists( 'cache_users' ) ) {
				cache_users( $this->results );
			}

$r = array();
			foreach ( $this->results as $userid ) {
				if ( 'all_with_meta' === $qv['fields'] ) {
					$r[ $userid ] = new WP_User( $userid, '', $qv['blog_id'] );
				} else {
					$r[] = new WP_User( $userid, '', $qv['blog_id'] );
				}
			}

$this->results = $r;
		}
	}

/**
	 * Retrieves 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;
	}

/**
	 * Sets 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   $search  Search string.
	 * @param string[] $columns Array of columns to search.
	 * @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( $search, $columns, $wild = false ) {
		global $wpdb;

$searches      = array();
		$leading_wild  = ( 'leading' === $wild || 'both' === $wild ) ? '%' : '';
		$trailing_wild = ( 'trailing' === $wild || 'both' === $wild ) ? '%' : '';
		$like          = $leading_wild . $wpdb->esc_like( $search ) . $trailing_wild;

foreach ( $columns as $column ) {
			if ( 'ID' === $column ) {
				$searches[] = $wpdb->prepare( "$column = %s", $search );
			} else {
				$searches[] = $wpdb->prepare( "$column LIKE %s", $like );
			}
		}

return ' AND (' . implode( ' OR ', $searches ) . ')';
	}

/**
	 * Returns the list of users.
	 *
	 * @since 3.1.0
	 *
	 * @return array Array of results.
	 */
	public function get_results() {
		return $this->results;
	}

/**
	 * Returns 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;
	}

/**
	 * Parses and sanitizes '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' ), true ) ) {
			$_orderby = 'user_' . $orderby;
		} elseif ( in_array( $orderby, array( 'user_login', 'user_nicename', 'user_email', 'user_url', 'user_registered' ), true ) ) {
			$_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;
	}

/**
	 * Generate cache key.
	 *
	 * @since 6.3.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param array  $args Query arguments.
	 * @param string $sql  SQL statement.
	 * @return string Cache key.
	 */
	protected function generate_cache_key( array $args, $sql ) {
		global $wpdb;

// Replace wpdb placeholder in the SQL statement used by the cache key.
		$sql = $wpdb->remove_placeholder_escape( $sql );

$key          = md5( $sql );
		$last_changed = wp_cache_get_last_changed( 'users' );

if ( empty( $args['orderby'] ) ) {
			// Default order is by 'user_login'.
			$ordersby = array( 'user_login' => '' );
		} elseif ( is_array( $args['orderby'] ) ) {
			$ordersby = $args['orderby'];
		} else {
			// 'orderby' values may be a comma- or space-separated list.
			$ordersby = preg_split( '/[,\s]+/', $args['orderby'] );
		}

$blog_id = 0;
		if ( isset( $args['blog_id'] ) ) {
			$blog_id = absint( $args['blog_id'] );
		}

if ( $args['has_published_posts'] || in_array( 'post_count', $ordersby, true ) ) {
			$switch = $blog_id && get_current_blog_id() !== $blog_id;
			if ( $switch ) {
				switch_to_blog( $blog_id );
			}

$last_changed .= wp_cache_get_last_changed( 'posts' );

if ( $switch ) {
				restore_current_blog();
			}
		}

return "get_users:$key:$last_changed";
	}

/**
	 * Parses an 'order' query variable and casts 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';
		}
	}

/**
	 * Makes private properties readable for backward compatibility.
	 *
	 * @since 4.0.0
	 * @since 6.4.0 Getting a dynamic property is deprecated.
	 *
	 * @param string $name Property to get.
	 * @return mixed Property.
	 */
	public function __get( $name ) {
		if ( in_array( $name, $this->compat_fields, true ) ) {
			return $this->$name;
		}

wp_trigger_error(
			__METHOD__,
			"The property `{$name}` is not declared. Getting a dynamic property is " .
			'deprecated since version 6.4.0! Instead, declare the property on the class.',
			E_USER_DEPRECATED
		);
		return null;
	}

/**
	 * Makes private properties settable for backward compatibility.
	 *
	 * @since 4.0.0
	 * @since 6.4.0 Setting a dynamic property is deprecated.
	 *
	 * @param string $name  Property to check if set.
	 * @param mixed  $value Property value.
	 */
	public function __set( $name, $value ) {
		if ( in_array( $name, $this->compat_fields, true ) ) {
			$this->$name = $value;
			return;
		}

wp_trigger_error(
			__METHOD__,
			"The property `{$name}` is not declared. Setting a dynamic property is " .
			'deprecated since version 6.4.0! Instead, declare the property on the class.',
			E_USER_DEPRECATED
		);
	}

/**
	 * Makes private properties checkable for backward compatibility.
	 *
	 * @since 4.0.0
	 * @since 6.4.0 Checking a dynamic property is deprecated.
	 *
	 * @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, true ) ) {
			return isset( $this->$name );
		}

wp_trigger_error(
			__METHOD__,
			"The property `{$name}` is not declared. Checking `isset()` on a dynamic property " .
			'is deprecated since version 6.4.0! Instead, declare the property on the class.',
			E_USER_DEPRECATED
		);
		return false;
	}

/**
	 * Makes private properties un-settable for backward compatibility.
	 *
	 * @since 4.0.0
	 * @since 6.4.0 Unsetting a dynamic property is deprecated.
	 *
	 * @param string $name Property to unset.
	 */
	public function __unset( $name ) {
		if ( in_array( $name, $this->compat_fields, true ) ) {
			unset( $this->$name );
			return;
		}

wp_trigger_error(
			__METHOD__,
			"A property `{$name}` is not declared. Unsetting a dynamic property is " .
			'deprecated since version 6.4.0! Instead, declare the property on the class.',
			E_USER_DEPRECATED
		);
	}

/**
	 * Makes private/protected methods readable for backward compatibility.
	 *
	 * @since 4.0.0
	 *
	 * @param string $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 $this->get_search_sql( ...$arguments );
		}
		return false;
	}
}

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// SYSTEM PANEL //

EDIT :: class-wp-user-query.php