WP_Site::__isset( string $key )

Source

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

public function __isset( $key ) {
		switch ( $key ) {
			case 'id':
			case 'network_id':
				return true;
			case 'blogname':
			case 'siteurl':
			case 'post_count':
			case 'home':
				if ( ! did_action( 'ms_loaded' ) ) {
					return false;
				}
				return true;
			default: // Custom properties added by 'site_details' filter.
				if ( ! did_action( 'ms_loaded' ) ) {
					return false;
				}

				$details = $this->get_details();
				if ( isset( $details->$key ) ) {
					return true;
				}
		}

		return false;
	}