protected function isSortable($column = null)
    {
        if ($column === null) {
            return (count($this->getSortableColumns()) > 0);
        }

        return array_key_exists($column, $this->getSortableColumns());
    }
protected function isSortable($column = null)
    {
        if ($column === null) {
            return (count($this->getSortableColumns()) > 0);
        }

        return array_key_exists($column, $this->getSortableColumns());
    }
protected function isSortable ( $ column = null ) { if ( $ column === null ) { return ( count ( $ this -> getSortableColumns ( ) ) > 0 ) ; } return array_key_exists ( $ column , $ this -> getSortableColumns ( ) ) ; }
Returns true if the column can be sorted.
Returns true if the column can be sorted .