WP_REST_Site_Health_Controller::get_directory_sizes()

	public function get_directory_sizes() {
		if ( ! class_exists( 'WP_Debug_Data' ) ) {
			require_once ABSPATH . 'wp-admin/includes/class-wp-debug-data.php';
		}

		$this->load_admin_textdomain();

		$sizes_data = WP_Debug_Data::get_sizes();
		$all_sizes  = array( 'raw' => 0 );

		foreach ( $sizes_data as $name => $value ) {
			$name = sanitize_text_field( $name );
			$data = array();

			if ( isset( $value['size'] ) ) {
				if ( is_string( $value['size'] ) ) {
					$data['size'] = sanitize_text_field( $value['size'] );
				} else {
					$data['size'] = (int) $value['size'];
				}
			}

			if ( isset( $value['debug'] ) ) {
				if ( is_string( $value['debug'] ) ) {
					$data['debug'] = sanitize_text_field( $value['debug'] );
				} else {
					$data['debug'] = (int) $value['debug'];
				}
			}

			if ( ! empty( $value['raw'] ) ) {
				$data['raw'] = (int) $value['raw'];
			}

			$all_sizes[ $name ] = $data;
		}

		if ( isset( $all_sizes['total_size']['debug'] ) && 'not available' === $all_sizes['total_size']['debug'] ) {
			return new WP_Error( 'not_available', __( 'Directory sizes could not be returned.' ), array( 'status' => 500 ) );
		}

		return $all_sizes;
	}