BuddyPress::versions()

	private function versions() {

		// Get the possible DB versions (boy is this gross)
		$versions               = array();
		$versions['1.6-single'] = get_blog_option( $this->root_blog_id, '_bp_db_version' );

		// 1.6-single exists, so trust it
		if ( !empty( $versions['1.6-single'] ) ) {
			$this->db_version_raw = (int) $versions['1.6-single'];

		// If no 1.6-single exists, use the max of the others
		} else {
			$versions['1.2']        = get_site_option(                      'bp-core-db-version' );
			$versions['1.5-multi']  = get_site_option(                           'bp-db-version' );
			$versions['1.6-multi']  = get_site_option(                          '_bp_db_version' );
			$versions['1.5-single'] = get_blog_option( $this->root_blog_id,      'bp-db-version' );

			// Remove empty array items
			$versions             = array_filter( $versions );
			$this->db_version_raw = (int) ( !empty( $versions ) ) ? (int) max( $versions ) : 0;
		}
	}