bp_core_get_root_options()

function bp_core_get_root_options() {
	global $wpdb;

	// Get all the BuddyPress settings, and a few useful WP ones too.
	$root_blog_options                   = bp_get_default_options();
	$root_blog_options['registration']   = '0';
	$root_blog_options['avatar_default'] = 'mysteryman';
	$root_blog_option_keys               = array_keys( $root_blog_options );

	// Do some magic to get all the root blog options in 1 swoop
	// Check cache first - We cache here instead of using the standard WP
	// settings cache because the current blog may not be the root blog,
	// and it's not practical to access the cache across blogs.
	$root_blog_options_meta = wp_cache_get( 'root_blog_options', 'bp' );

	if ( false === $root_blog_options_meta ) {
		$blog_options_keys      = "'" . join( "', '", (array) $root_blog_option_keys ) . "'";
		$blog_options_table	    = bp_is_multiblog_mode() ? $wpdb->options : $wpdb->get_blog_prefix( bp_get_root_blog_id() ) . 'options';
		$blog_options_query     = "SELECT option_name AS name, option_value AS value FROM {$blog_options_table} WHERE option_name IN ( {$blog_options_keys} )";
		$root_blog_options_meta = $wpdb->get_results( $blog_options_query );

		// On Multisite installations, some options must always be fetched from sitemeta.
		if ( is_multisite() ) {

			/**
			 * Filters multisite options retrieved from sitemeta.
			 *
			 * @since BuddyPress 1.5.0
			 *
			 * @param array $value Array of multisite options from sitemeta table.
			 */
			$network_options = apply_filters( 'bp_core_network_options', array(
				'tags_blog_id'       => '0',
				'sitewide_tags_blog' => '',
				'registration'       => '0',
				'fileupload_maxk'    => '1500'
			) );

			$current_site           = get_current_site();
			$network_option_keys    = array_keys( $network_options );
			$sitemeta_options_keys  = "'" . join( "', '", (array) $network_option_keys ) . "'";
			$sitemeta_options_query = $wpdb->prepare( "SELECT meta_key AS name, meta_value AS value FROM {$wpdb->sitemeta} WHERE meta_key IN ( {$sitemeta_options_keys} ) AND site_id = %d", $current_site->id );
			$network_options_meta   = $wpdb->get_results( $sitemeta_options_query );

			// Sitemeta comes second in the merge, so that network 'registration' value wins.
			$root_blog_options_meta = array_merge( $root_blog_options_meta, $network_options_meta );
		}

		// Loop through our results and make them usable.
		foreach ( $root_blog_options_meta as $root_blog_option ) {
			$root_blog_options[$root_blog_option->name] = $root_blog_option->value;
		}

		// Copy the options no the return val.
		$root_blog_options_meta = $root_blog_options;

		// Clean up our temporary copy.
		unset( $root_blog_options );

		wp_cache_set( 'root_blog_options', $root_blog_options_meta, 'bp' );
	}

	/**
	 * Filters the global BP options.
	 *
	 * @since BuddyPress 1.5.0
	 *
	 * @param array $root_blog_options_meta Array of global BP options.
	 */
	return apply_filters( 'bp_core_get_root_options', $root_blog_options_meta );
}