Hi, the documentation of the lack of information addSortItem the value that we want to filter. The following example generates an error in the documentation table.
<?php
$dataSource = new \Kendo\Data\DataSource('DataSource');
$sortItem = new \Kendo\Data\DataSourceSortItem();
$dir = 'value';
$sortItem->dir($dir);
$dataSource->addSortItem($sortItem);
?>
My suggestion to the look an example:
<?php
$dataSource = new \Kendo\Data\DataSource('DataSource');
$sortItem = new \Kendo\Data\DataSourceSortItem();
$sortItem->field('value')->dir('dir');
$dataSource->addSortItem($sortItem);
?>