WP_User::__construct( int|string|stdClass|WP_User $id, string $name = '', int $site_id = '' )

	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;
		}
	}