public function sortKey($model = null, array $options = [])
    {
        if (empty($options)) {
            $options = $this->params($model);
        }
        if (!empty($options['sort'])) {
            return $options['sort'];
        }

        return null;
    }
public function sortKey($model = null, array $options = [])
    {
        if (empty($options)) {
            $options = $this->params($model);
        }
        if (!empty($options['sort'])) {
            return $options['sort'];
        }

        return null;
    }
public function sortKey ( $ model = null , array $ options = [ ] ) { if ( empty ( $ options ) ) { $ options = $ this -> params ( $ model ) ; } if ( ! empty ( $ options [ 'sort' ] ) ) { return $ options [ 'sort' ] ; } return null ; }
Gets the current key by which the recordset is sorted

@param string|null $model Optional model name. Uses the default if none is specified.
@param array $options Options for pagination links. See #options for list of keys.
@return string|null The name of the key by which the recordset is being sorted, or
null if the results are not currently sorted.
@link https://book.cakephp.org/3.0/en/views/helpers/paginator.html#creating-sort-links
Gets the current key by which the recordset is sorted