WP_Network::get_main_site_id(): int

Source

private function get_main_site_id() {
	/**
	 * Filters the main site ID.
	 *
	 * Returning a positive integer will effectively short-circuit the function.
	 *
	 * @since 4.9.0
	 *
	 * @param int|null   $main_site_id If a positive integer is returned, it is interpreted as the main site ID.
	 * @param WP_Network $network      The network object for which the main site was detected.
	 */
	$main_site_id = (int) apply_filters( 'pre_get_main_site_id', null, $this );

	if ( 0 < $main_site_id ) {
		return $main_site_id;
	}

	if ( 0 < (int) $this->blog_id ) {
		return (int) $this->blog_id;
	}

	if ( ( defined( 'DOMAIN_CURRENT_SITE' ) && defined( 'PATH_CURRENT_SITE' )
		&& DOMAIN_CURRENT_SITE === $this->domain && PATH_CURRENT_SITE === $this->path )
		|| ( defined( 'SITE_ID_CURRENT_SITE' ) && (int) SITE_ID_CURRENT_SITE === $this->id )
	) {
		if ( defined( 'BLOG_ID_CURRENT_SITE' ) ) {
			$this->blog_id = (string) BLOG_ID_CURRENT_SITE;

			return (int) $this->blog_id;
		}

		if ( defined( 'BLOGID_CURRENT_SITE' ) ) { // Deprecated.
			$this->blog_id = (string) BLOGID_CURRENT_SITE;

			return (int) $this->blog_id;
		}
	}

	$site = get_site();
	if ( $site->domain === $this->domain && $site->path === $this->path ) {
		$main_site_id = (int) $site->id;
	} else {

		$main_site_id = get_network_option( $this->id, 'main_site' );
		if ( false === $main_site_id ) {
			$_sites       = get_sites(
				array(
					'fields'     => 'ids',
					'number'     => 1,
					'domain'     => $this->domain,
					'path'       => $this->path,
					'network_id' => $this->id,
				)
			);
			$main_site_id = ! empty( $_sites ) ? array_shift( $_sites ) : 0;

			update_network_option( $this->id, 'main_site', $main_site_id );
		}
	}

	$this->blog_id = (string) $main_site_id;

	return (int) $this->blog_id;
}

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