symfony 3 iteration of array of objects too long - php

Question

I got an array of symfony3 entities which is 50000 in total. I need to iterate this array and find some entities that match certain criteria.
code is shown below:
$p_r = $em->getRepository('AppBundle:Product_region')->findall();//50000 elements in array
$rowid_2 = $product->getRowId();//some product entity
foreach($p_r as $pr){
$rowid_1 = $pr->getProductid()->getRowId();
if($rowid_1 == $rowid_2){
$regions[] = $pr->getRegionid()->getName();
$filial_name = $pr->getRegionid()->getFilial()->getName();
if(!in_array($filial_name, $filials)){
$filials[] = $filial_name;
}
}
}
The problem is when iteration takes approx 1 second which is very long.it takes about 25% of a CPU 1 core to finish the operation. I tested it on a different array of numbers and observed it took about 0.002 sec to iterate through 50 000 elements. Any ideas how to speed it up and where to search for a delay would be welcome. Thank you.

Answer 1

If You want to find some entities that match certain criteria You could use Doctrine's 2 Criteria to fetch those entities.
I found it really usefull. Here you have link to Doctrine's docs:
http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/working-with-associations.html#filtering-collections
Hope this helps. :)

Answer 2

You have two options. Create a Region/Product Symfony Repository and craft a finder function using QueryBuilder/DQL that you can specify the ID you're searching for OR use the ArrayCollection functions and Criteria to filter your results.
use Doctrine\Common\Collections\Criteria;
$criteria = Criteria::create()->where(Criteria::expr()->eq('product_id', $product_id))->setFirstResult(0);
$items = $p_r->matching($criteria);
Iterating (foreach) over that array of objects will trigger lazy loading which will hog CPU/Memory. Check out the code for Doctrine ArrayCollections and Criteria