Source

File: wp-includes/class-wp-site.php

private function get_details() {
		$details = wp_cache_get( $this->blog_id, 'site-details' );

		if ( false === $details ) {

			switch_to_blog( $this->blog_id );
			// Create a raw copy of the object for backward compatibility with the filter below.
			$details = new stdClass();
			foreach ( get_object_vars( $this ) as $key => $value ) {
				$details->$key = $value;
			}
			$details->blogname   = get_option( 'blogname' );
			$details->siteurl    = get_option( 'siteurl' );
			$details->post_count = get_option( 'post_count' );
			$details->home       = get_option( 'home' );
			restore_current_blog();

			wp_cache_set( $this->blog_id, $details, 'site-details' );
		}

		/** This filter is documented in wp-includes/ms-blogs.php */
		$details = apply_filters_deprecated( 'blog_details', array( $details ), '4.7.0', 'site_details' );

		/**
		 * Filters a site's extended properties.
		 *
		 * @since 4.6.0
		 *
		 * @param stdClass $details The site details.
		 */
		$details = apply_filters( 'site_details', $details );

		return $details;
	}