balmet.com

class-wp-user.php (22194B)

---

 <?php
 /**
  * User API: WP_User class
  *
  * @package WordPress
  * @subpackage Users
  * @since 4.4.0
  */
 
 /**
  * Core class used to implement the WP_User object.
  *
  * @since 2.0.0
  *
  * @property string $nickname
  * @property string $description
  * @property string $user_description
  * @property string $first_name
  * @property string $user_firstname
  * @property string $last_name
  * @property string $user_lastname
  * @property string $user_login
  * @property string $user_pass
  * @property string $user_nicename
  * @property string $user_email
  * @property string $user_url
  * @property string $user_registered
  * @property string $user_activation_key
  * @property string $user_status
  * @property int    $user_level
  * @property string $display_name
  * @property string $spam
  * @property string $deleted
  * @property string $locale
  * @property string $rich_editing
  * @property string $syntax_highlighting
  */
 class WP_User {
 	/**
 	 * User data container.
 	 *
 	 * @since 2.0.0
 	 * @var stdClass
 	 */
 	public $data;
 
 	/**
 	 * The user's ID.
 	 *
 	 * @since 2.1.0
 	 * @var int
 	 */
 	public $ID = 0;
 
 	/**
 	 * Capabilities that the individual user has been granted outside of those inherited from their role.
 	 *
 	 * @since 2.0.0
 	 * @var bool[] Array of key/value pairs where keys represent a capability name
 	 *             and boolean values represent whether the user has that capability.
 	 */
 	public $caps = array();
 
 	/**
 	 * User metadata option name.
 	 *
 	 * @since 2.0.0
 	 * @var string
 	 */
 	public $cap_key;
 
 	/**
 	 * The roles the user is part of.
 	 *
 	 * @since 2.0.0
 	 * @var string[]
 	 */
 	public $roles = array();
 
 	/**
 	 * All capabilities the user has, including individual and role based.
 	 *
 	 * @since 2.0.0
 	 * @var bool[] Array of key/value pairs where keys represent a capability name
 	 *             and boolean values represent whether the user has that capability.
 	 */
 	public $allcaps = array();
 
 	/**
 	 * The filter context applied to user data fields.
 	 *
 	 * @since 2.9.0
 	 * @var string
 	 */
 	public $filter = null;
 
 	/**
 	 * The site ID the capabilities of this user are initialized for.
 	 *
 	 * @since 4.9.0
 	 * @var int
 	 */
 	private $site_id = 0;
 
 	/**
 	 * @since 3.3.0
 	 * @var array
 	 */
 	private static $back_compat_keys;
 
 	/**
 	 * Constructor.
 	 *
 	 * Retrieves the userdata and passes it to WP_User::init().
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param int|string|stdClass|WP_User $id      User's ID, a WP_User object, or a user object from the DB.
 	 * @param string                      $name    Optional. User's username
 	 * @param int                         $site_id Optional Site ID, defaults to current site.
 	 */
 	public function __construct( $id = 0, $name = '', $site_id = '' ) {
 		if ( ! isset( self::$back_compat_keys ) ) {
 			$prefix                 = $GLOBALS['wpdb']->prefix;
 			self::$back_compat_keys = array(
 				'user_firstname'             => 'first_name',
 				'user_lastname'              => 'last_name',
 				'user_description'           => 'description',
 				'user_level'                 => $prefix . 'user_level',
 				$prefix . 'usersettings'     => $prefix . 'user-settings',
 				$prefix . 'usersettingstime' => $prefix . 'user-settings-time',
 			);
 		}
 
 		if ( $id instanceof WP_User ) {
 			$this->init( $id->data, $site_id );
 			return;
 		} elseif ( is_object( $id ) ) {
 			$this->init( $id, $site_id );
 			return;
 		}
 
 		if ( ! empty( $id ) && ! is_numeric( $id ) ) {
 			$name = $id;
 			$id   = 0;
 		}
 
 		if ( $id ) {
 			$data = self::get_data_by( 'id', $id );
 		} else {
 			$data = self::get_data_by( 'login', $name );
 		}
 
 		if ( $data ) {
 			$this->init( $data, $site_id );
 		} else {
 			$this->data = new stdClass;
 		}
 	}
 
 	/**
 	 * Sets up object properties, including capabilities.
 	 *
 	 * @since 3.3.0
 	 *
 	 * @param object $data    User DB row object.
 	 * @param int    $site_id Optional. The site ID to initialize for.
 	 */
 	public function init( $data, $site_id = '' ) {
 		if ( ! isset( $data->ID ) ) {
 			$data->ID = 0;
 		}
 		$this->data = $data;
 		$this->ID   = (int) $data->ID;
 
 		$this->for_site( $site_id );
 	}
 
 	/**
 	 * Return only the main user fields
 	 *
 	 * @since 3.3.0
 	 * @since 4.4.0 Added 'ID' as an alias of 'id' for the `$field` parameter.
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 *
 	 * @param string     $field The field to query against: 'id', 'ID', 'slug', 'email' or 'login'.
 	 * @param string|int $value The field value
 	 * @return object|false Raw user object
 	 */
 	public static function get_data_by( $field, $value ) {
 		global $wpdb;
 
 		// 'ID' is an alias of 'id'.
 		if ( 'ID' === $field ) {
 			$field = 'id';
 		}
 
 		if ( 'id' === $field ) {
 			// Make sure the value is numeric to avoid casting objects, for example,
 			// to int 1.
 			if ( ! is_numeric( $value ) ) {
 				return false;
 			}
 			$value = (int) $value;
 			if ( $value < 1 ) {
 				return false;
 			}
 		} else {
 			$value = trim( $value );
 		}
 
 		if ( ! $value ) {
 			return false;
 		}
 
 		switch ( $field ) {
 			case 'id':
 				$user_id  = $value;
 				$db_field = 'ID';
 				break;
 			case 'slug':
 				$user_id  = wp_cache_get( $value, 'userslugs' );
 				$db_field = 'user_nicename';
 				break;
 			case 'email':
 				$user_id  = wp_cache_get( $value, 'useremail' );
 				$db_field = 'user_email';
 				break;
 			case 'login':
 				$value    = sanitize_user( $value );
 				$user_id  = wp_cache_get( $value, 'userlogins' );
 				$db_field = 'user_login';
 				break;
 			default:
 				return false;
 		}
 
 		if ( false !== $user_id ) {
 			$user = wp_cache_get( $user_id, 'users' );
 			if ( $user ) {
 				return $user;
 			}
 		}
 
 		$user = $wpdb->get_row(
 			$wpdb->prepare(
 				"SELECT * FROM $wpdb->users WHERE $db_field = %s LIMIT 1",
 				$value
 			)
 		);
 		if ( ! $user ) {
 			return false;
 		}
 
 		update_user_caches( $user );
 
 		return $user;
 	}
 
 	/**
 	 * Magic method for checking the existence of a certain custom field.
 	 *
 	 * @since 3.3.0
 	 *
 	 * @param string $key User meta key to check if set.
 	 * @return bool Whether the given user meta key is set.
 	 */
 	public function __isset( $key ) {
 		if ( 'id' === $key ) {
 			_deprecated_argument(
 				'WP_User->id',
 				'2.1.0',
 				sprintf(
 					/* translators: %s: WP_User->ID */
 					__( 'Use %s instead.' ),
 					'<code>WP_User->ID</code>'
 				)
 			);
 			$key = 'ID';
 		}
 
 		if ( isset( $this->data->$key ) ) {
 			return true;
 		}
 
 		if ( isset( self::$back_compat_keys[ $key ] ) ) {
 			$key = self::$back_compat_keys[ $key ];
 		}
 
 		return metadata_exists( 'user', $this->ID, $key );
 	}
 
 	/**
 	 * Magic method for accessing custom fields.
 	 *
 	 * @since 3.3.0
 	 *
 	 * @param string $key User meta key to retrieve.
 	 * @return mixed Value of the given user meta key (if set). If `$key` is 'id', the user ID.
 	 */
 	public function __get( $key ) {
 		if ( 'id' === $key ) {
 			_deprecated_argument(
 				'WP_User->id',
 				'2.1.0',
 				sprintf(
 					/* translators: %s: WP_User->ID */
 					__( 'Use %s instead.' ),
 					'<code>WP_User->ID</code>'
 				)
 			);
 			return $this->ID;
 		}
 
 		if ( isset( $this->data->$key ) ) {
 			$value = $this->data->$key;
 		} else {
 			if ( isset( self::$back_compat_keys[ $key ] ) ) {
 				$key = self::$back_compat_keys[ $key ];
 			}
 			$value = get_user_meta( $this->ID, $key, true );
 		}
 
 		if ( $this->filter ) {
 			$value = sanitize_user_field( $key, $value, $this->ID, $this->filter );
 		}
 
 		return $value;
 	}
 
 	/**
 	 * Magic method for setting custom user fields.
 	 *
 	 * This method does not update custom fields in the database. It only stores
 	 * the value on the WP_User instance.
 	 *
 	 * @since 3.3.0
 	 *
 	 * @param string $key   User meta key.
 	 * @param mixed  $value User meta value.
 	 */
 	public function __set( $key, $value ) {
 		if ( 'id' === $key ) {
 			_deprecated_argument(
 				'WP_User->id',
 				'2.1.0',
 				sprintf(
 					/* translators: %s: WP_User->ID */
 					__( 'Use %s instead.' ),
 					'<code>WP_User->ID</code>'
 				)
 			);
 			$this->ID = $value;
 			return;
 		}
 
 		$this->data->$key = $value;
 	}
 
 	/**
 	 * Magic method for unsetting a certain custom field.
 	 *
 	 * @since 4.4.0
 	 *
 	 * @param string $key User meta key to unset.
 	 */
 	public function __unset( $key ) {
 		if ( 'id' === $key ) {
 			_deprecated_argument(
 				'WP_User->id',
 				'2.1.0',
 				sprintf(
 					/* translators: %s: WP_User->ID */
 					__( 'Use %s instead.' ),
 					'<code>WP_User->ID</code>'
 				)
 			);
 		}
 
 		if ( isset( $this->data->$key ) ) {
 			unset( $this->data->$key );
 		}
 
 		if ( isset( self::$back_compat_keys[ $key ] ) ) {
 			unset( self::$back_compat_keys[ $key ] );
 		}
 	}
 
 	/**
 	 * Determine whether the user exists in the database.
 	 *
 	 * @since 3.4.0
 	 *
 	 * @return bool True if user exists in the database, false if not.
 	 */
 	public function exists() {
 		return ! empty( $this->ID );
 	}
 
 	/**
 	 * Retrieve the value of a property or meta key.
 	 *
 	 * Retrieves from the users and usermeta table.
 	 *
 	 * @since 3.3.0
 	 *
 	 * @param string $key Property
 	 * @return mixed
 	 */
 	public function get( $key ) {
 		return $this->__get( $key );
 	}
 
 	/**
 	 * Determine whether a property or meta key is set
 	 *
 	 * Consults the users and usermeta tables.
 	 *
 	 * @since 3.3.0
 	 *
 	 * @param string $key Property
 	 * @return bool
 	 */
 	public function has_prop( $key ) {
 		return $this->__isset( $key );
 	}
 
 	/**
 	 * Return an array representation.
 	 *
 	 * @since 3.5.0
 	 *
 	 * @return array Array representation.
 	 */
 	public function to_array() {
 		return get_object_vars( $this->data );
 	}
 
 	/**
 	 * Makes private/protected methods readable for backward compatibility.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @param string $name      Method to call.
 	 * @param array  $arguments Arguments to pass when calling.
 	 * @return mixed|false Return value of the callback, false otherwise.
 	 */
 	public function __call( $name, $arguments ) {
 		if ( '_init_caps' === $name ) {
 			return $this->_init_caps( ...$arguments );
 		}
 		return false;
 	}
 
 	/**
 	 * Set up capability object properties.
 	 *
 	 * Will set the value for the 'cap_key' property to current database table
 	 * prefix, followed by 'capabilities'. Will then check to see if the
 	 * property matching the 'cap_key' exists and is an array. If so, it will be
 	 * used.
 	 *
 	 * @since 2.1.0
 	 * @deprecated 4.9.0 Use WP_User::for_site()
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 *
 	 * @param string $cap_key Optional capability key
 	 */
 	protected function _init_caps( $cap_key = '' ) {
 		global $wpdb;
 
 		_deprecated_function( __METHOD__, '4.9.0', 'WP_User::for_site()' );
 
 		if ( empty( $cap_key ) ) {
 			$this->cap_key = $wpdb->get_blog_prefix( $this->site_id ) . 'capabilities';
 		} else {
 			$this->cap_key = $cap_key;
 		}
 
 		$this->caps = $this->get_caps_data();
 
 		$this->get_role_caps();
 	}
 
 	/**
 	 * Retrieves all of the capabilities of the user's roles, and merges them with
 	 * individual user capabilities.
 	 *
 	 * All of the capabilities of the user's roles are merged with the user's individual
 	 * capabilities. This means that the user can be denied specific capabilities that
 	 * their role might have, but the user is specifically denied.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @return bool[] Array of key/value pairs where keys represent a capability name
 	 *                and boolean values represent whether the user has that capability.
 	 */
 	public function get_role_caps() {
 		$switch_site = false;
 		if ( is_multisite() && get_current_blog_id() != $this->site_id ) {
 			$switch_site = true;
 
 			switch_to_blog( $this->site_id );
 		}
 
 		$wp_roles = wp_roles();
 
 		// Filter out caps that are not role names and assign to $this->roles.
 		if ( is_array( $this->caps ) ) {
 			$this->roles = array_filter( array_keys( $this->caps ), array( $wp_roles, 'is_role' ) );
 		}
 
 		// Build $allcaps from role caps, overlay user's $caps.
 		$this->allcaps = array();
 		foreach ( (array) $this->roles as $role ) {
 			$the_role      = $wp_roles->get_role( $role );
 			$this->allcaps = array_merge( (array) $this->allcaps, (array) $the_role->capabilities );
 		}
 		$this->allcaps = array_merge( (array) $this->allcaps, (array) $this->caps );
 
 		if ( $switch_site ) {
 			restore_current_blog();
 		}
 
 		return $this->allcaps;
 	}
 
 	/**
 	 * Add role to user.
 	 *
 	 * Updates the user's meta data option with capabilities and roles.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param string $role Role name.
 	 */
 	public function add_role( $role ) {
 		if ( empty( $role ) ) {
 			return;
 		}
 
 		$this->caps[ $role ] = true;
 		update_user_meta( $this->ID, $this->cap_key, $this->caps );
 		$this->get_role_caps();
 		$this->update_user_level_from_caps();
 
 		/**
 		 * Fires immediately after the user has been given a new role.
 		 *
 		 * @since 4.3.0
 		 *
 		 * @param int    $user_id The user ID.
 		 * @param string $role    The new role.
 		 */
 		do_action( 'add_user_role', $this->ID, $role );
 	}
 
 	/**
 	 * Remove role from user.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param string $role Role name.
 	 */
 	public function remove_role( $role ) {
 		if ( ! in_array( $role, $this->roles, true ) ) {
 			return;
 		}
 		unset( $this->caps[ $role ] );
 		update_user_meta( $this->ID, $this->cap_key, $this->caps );
 		$this->get_role_caps();
 		$this->update_user_level_from_caps();
 
 		/**
 		 * Fires immediately after a role as been removed from a user.
 		 *
 		 * @since 4.3.0
 		 *
 		 * @param int    $user_id The user ID.
 		 * @param string $role    The removed role.
 		 */
 		do_action( 'remove_user_role', $this->ID, $role );
 	}
 
 	/**
 	 * Set the role of the user.
 	 *
 	 * This will remove the previous roles of the user and assign the user the
 	 * new one. You can set the role to an empty string and it will remove all
 	 * of the roles from the user.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param string $role Role name.
 	 */
 	public function set_role( $role ) {
 		if ( 1 === count( $this->roles ) && current( $this->roles ) == $role ) {
 			return;
 		}
 
 		foreach ( (array) $this->roles as $oldrole ) {
 			unset( $this->caps[ $oldrole ] );
 		}
 
 		$old_roles = $this->roles;
 		if ( ! empty( $role ) ) {
 			$this->caps[ $role ] = true;
 			$this->roles         = array( $role => true );
 		} else {
 			$this->roles = false;
 		}
 		update_user_meta( $this->ID, $this->cap_key, $this->caps );
 		$this->get_role_caps();
 		$this->update_user_level_from_caps();
 
 		/**
 		 * Fires after the user's role has changed.
 		 *
 		 * @since 2.9.0
 		 * @since 3.6.0 Added $old_roles to include an array of the user's previous roles.
 		 *
 		 * @param int      $user_id   The user ID.
 		 * @param string   $role      The new role.
 		 * @param string[] $old_roles An array of the user's previous roles.
 		 */
 		do_action( 'set_user_role', $this->ID, $role, $old_roles );
 	}
 
 	/**
 	 * Choose the maximum level the user has.
 	 *
 	 * Will compare the level from the $item parameter against the $max
 	 * parameter. If the item is incorrect, then just the $max parameter value
 	 * will be returned.
 	 *
 	 * Used to get the max level based on the capabilities the user has. This
 	 * is also based on roles, so if the user is assigned the Administrator role
 	 * then the capability 'level_10' will exist and the user will get that
 	 * value.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param int    $max  Max level of user.
 	 * @param string $item Level capability name.
 	 * @return int Max Level.
 	 */
 	public function level_reduction( $max, $item ) {
 		if ( preg_match( '/^level_(10|[0-9])$/i', $item, $matches ) ) {
 			$level = (int) $matches[1];
 			return max( $max, $level );
 		} else {
 			return $max;
 		}
 	}
 
 	/**
 	 * Update the maximum user level for the user.
 	 *
 	 * Updates the 'user_level' user metadata (includes prefix that is the
 	 * database table prefix) with the maximum user level. Gets the value from
 	 * the all of the capabilities that the user has.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 */
 	public function update_user_level_from_caps() {
 		global $wpdb;
 		$this->user_level = array_reduce( array_keys( $this->allcaps ), array( $this, 'level_reduction' ), 0 );
 		update_user_meta( $this->ID, $wpdb->get_blog_prefix() . 'user_level', $this->user_level );
 	}
 
 	/**
 	 * Add capability and grant or deny access to capability.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param string $cap   Capability name.
 	 * @param bool   $grant Whether to grant capability to user.
 	 */
 	public function add_cap( $cap, $grant = true ) {
 		$this->caps[ $cap ] = $grant;
 		update_user_meta( $this->ID, $this->cap_key, $this->caps );
 		$this->get_role_caps();
 		$this->update_user_level_from_caps();
 	}
 
 	/**
 	 * Remove capability from user.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param string $cap Capability name.
 	 */
 	public function remove_cap( $cap ) {
 		if ( ! isset( $this->caps[ $cap ] ) ) {
 			return;
 		}
 		unset( $this->caps[ $cap ] );
 		update_user_meta( $this->ID, $this->cap_key, $this->caps );
 		$this->get_role_caps();
 		$this->update_user_level_from_caps();
 	}
 
 	/**
 	 * Remove all of the capabilities of the user.
 	 *
 	 * @since 2.1.0
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 */
 	public function remove_all_caps() {
 		global $wpdb;
 		$this->caps = array();
 		delete_user_meta( $this->ID, $this->cap_key );
 		delete_user_meta( $this->ID, $wpdb->get_blog_prefix() . 'user_level' );
 		$this->get_role_caps();
 	}
 
 	/**
 	 * Returns whether the user has the specified capability.
 	 *
 	 * This function also accepts an ID of an object to check against if the capability is a meta capability. Meta
 	 * capabilities such as `edit_post` and `edit_user` are capabilities used by the `map_meta_cap()` function to
 	 * map to primitive capabilities that a user or role has, such as `edit_posts` and `edit_others_posts`.
 	 *
 	 * Example usage:
 	 *
 	 *     $user->has_cap( 'edit_posts' );
 	 *     $user->has_cap( 'edit_post', $post->ID );
 	 *     $user->has_cap( 'edit_post_meta', $post->ID, $meta_key );
 	 *
 	 * While checking against a role in place of a capability is supported in part, this practice is discouraged as it
 	 * may produce unreliable results.
 	 *
 	 * @since 2.0.0
 	 * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
 	 *              by adding it to the function signature.
 	 *
 	 * @see map_meta_cap()
 	 *
 	 * @param string $cap     Capability name.
 	 * @param mixed  ...$args Optional further parameters, typically starting with an object ID.
 	 * @return bool Whether the user has the given capability, or, if an object ID is passed, whether the user has
 	 *              the given capability for that object.
 	 */
 	public function has_cap( $cap, ...$args ) {
 		if ( is_numeric( $cap ) ) {
 			_deprecated_argument( __FUNCTION__, '2.0.0', __( 'Usage of user levels is deprecated. Use capabilities instead.' ) );
 			$cap = $this->translate_level_to_cap( $cap );
 		}
 
 		$caps = map_meta_cap( $cap, $this->ID, ...$args );
 
 		// Multisite super admin has all caps by definition, Unless specifically denied.
 		if ( is_multisite() && is_super_admin( $this->ID ) ) {
 			if ( in_array( 'do_not_allow', $caps, true ) ) {
 				return false;
 			}
 			return true;
 		}
 
 		// Maintain BC for the argument passed to the "user_has_cap" filter.
 		$args = array_merge( array( $cap, $this->ID ), $args );
 
 		/**
 		 * Dynamically filter a user's capabilities.
 		 *
 		 * @since 2.0.0
 		 * @since 3.7.0 Added the `$user` parameter.
 		 *
 		 * @param bool[]   $allcaps Array of key/value pairs where keys represent a capability name
 		 *                          and boolean values represent whether the user has that capability.
 		 * @param string[] $caps    Required primitive capabilities for the requested capability.
 		 * @param array    $args {
 		 *     Arguments that accompany the requested capability check.
 		 *
 		 *     @type string    $0 Requested capability.
 		 *     @type int       $1 Concerned user ID.
 		 *     @type mixed  ...$2 Optional second and further parameters, typically object ID.
 		 * }
 		 * @param WP_User  $user    The user object.
 		 */
 		$capabilities = apply_filters( 'user_has_cap', $this->allcaps, $caps, $args, $this );
 
 		// Everyone is allowed to exist.
 		$capabilities['exist'] = true;
 
 		// Nobody is allowed to do things they are not allowed to do.
 		unset( $capabilities['do_not_allow'] );
 
 		// Must have ALL requested caps.
 		foreach ( (array) $caps as $cap ) {
 			if ( empty( $capabilities[ $cap ] ) ) {
 				return false;
 			}
 		}
 
 		return true;
 	}
 
 	/**
 	 * Convert numeric level to level capability name.
 	 *
 	 * Prepends 'level_' to level number.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param int $level Level number, 1 to 10.
 	 * @return string
 	 */
 	public function translate_level_to_cap( $level ) {
 		return 'level_' . $level;
 	}
 
 	/**
 	 * Set the site to operate on. Defaults to the current site.
 	 *
 	 * @since 3.0.0
 	 * @deprecated 4.9.0 Use WP_User::for_site()
 	 *
 	 * @param int $blog_id Optional. Site ID, defaults to current site.
 	 */
 	public function for_blog( $blog_id = '' ) {
 		_deprecated_function( __METHOD__, '4.9.0', 'WP_User::for_site()' );
 
 		$this->for_site( $blog_id );
 	}
 
 	/**
 	 * Sets the site to operate on. Defaults to the current site.
 	 *
 	 * @since 4.9.0
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 *
 	 * @param int $site_id Site ID to initialize user capabilities for. Default is the current site.
 	 */
 	public function for_site( $site_id = '' ) {
 		global $wpdb;
 
 		if ( ! empty( $site_id ) ) {
 			$this->site_id = absint( $site_id );
 		} else {
 			$this->site_id = get_current_blog_id();
 		}
 
 		$this->cap_key = $wpdb->get_blog_prefix( $this->site_id ) . 'capabilities';
 
 		$this->caps = $this->get_caps_data();
 
 		$this->get_role_caps();
 	}
 
 	/**
 	 * Gets the ID of the site for which the user's capabilities are currently initialized.
 	 *
 	 * @since 4.9.0
 	 *
 	 * @return int Site ID.
 	 */
 	public function get_site_id() {
 		return $this->site_id;
 	}
 
 	/**
 	 * Gets the available user capabilities data.
 	 *
 	 * @since 4.9.0
 	 *
 	 * @return bool[] List of capabilities keyed by the capability name,
 	 *                e.g. array( 'edit_posts' => true, 'delete_posts' => false ).
 	 */
 	private function get_caps_data() {
 		$caps = get_user_meta( $this->ID, $this->cap_key, true );
 
 		if ( ! is_array( $caps ) ) {
 			return array();
 		}
 
 		return $caps;
 	}
 }