final public static function getColumns()
    {
        $result = [];
        foreach (static::COLUMNS as $column) {
            $result[] = trim(explode('[', $column, 2)[0]);
        }
        return $result;
    }
final public static function getColumns()
    {
        $result = [];
        foreach (static::COLUMNS as $column) {
            $result[] = trim(explode('[', $column, 2)[0]);
        }
        return $result;
    }
final public static function getColumns ( ) { $ result = [ ] ; foreach ( static :: COLUMNS as $ column ) { $ result [ ] = trim ( explode ( '[' , $ column , 2 ) [ 0 ] ) ; } return $ result ; }
Returns columns list without data type

@return string[]
Returns columns list without data type