static function is_error( $emask = null ) {
		if( $emask === null ){
			return (bool) self::get_global_level();
		}	
		else {
			return (bool) ( self::get_global_level() & $emask );
		}
	}
static function is_error( $emask = null ) {
		if( $emask === null ){
			return (bool) self::get_global_level();
		}	
		else {
			return (bool) ( self::get_global_level() & $emask );
		}
	}
static function is_error ( $ emask = null ) { if ( $ emask === null ) { return ( bool ) self :: get_global_level ( ) ; } else { return ( bool ) ( self :: get_global_level ( ) & $ emask ) ; } }
Test whether errors of a certain type have been raised system wide
@param int optional bitmask
@return bool
Test whether errors of a certain type have been raised system wide