Google data store inconsistent result fetch from select - php

Question

I seriously need help with GDS and PHP-GDS Library.
I am doing a fetch from outside google appengine using the fantastic php-gds library. So far the library works fine.
My problem is that my data fetch from GDS returns inconsistent results and I have no idea what the issue might be.
Please see code below:
<?php
//...
//...
$offset = 0;
do{
$query = "SELECT * FROM `KIND` order by _URI ASC limit 300 offset ".$offset;
$tableList=[];
$tableList = $this->obj_store->fetchAll($query);
$offset += count($tableList);
$allTables[] = $tableList;
$totalRecords = $offset;
}while(!empty($tableList));
echo $totalRecords; // i expect total records to be equal to the number of entities in the KIND.
// but the results are inconsistent. In some cases, it is correct
// but in most cases it is far less than the total records.
// I could have a KIND with 750 entities and only 721 will be returned in total.
// I could have a KIND with 900 entities and all entities will be returned.
// I could have a KIND with 4000 entities and only 1200 will be returned.
?>
Please help. Also when I run the exact same query in the cloud console I get the right entity count. (Hope this helps someone)
UPDATE
I ended up using cursors. New code below:
<?php
$query = "SELECT * FROM `KIND`";
$tableList=[];
$queryInit = $this->obj_store->query($query);
do{
$page = $this->obj_store->fetchPage(300);// fetch page.
$tableList = am($tableList,$page); //merge with existing records.
$this->obj_store->setCursor($this->obj_store->getCursor());//set next cursor to previous last cursor
}while(!empty($page)); //as long as page result is not empty.
?>

Answer 1

Try using a cursor instead of an offset. See the discussion of cursors (including samples in PHP) here:
https://cloud.google.com/datastore/docs/concepts/queries#datastore-cursor-paging-php