Why is my session data getting changed? - php

Question

In symfony and Doctrine i am using the session to save a query result then later on i am filtering this result with some parameters.
The problem is that once the parameters are changed i can't get the original results set. Here is the code
fetching results and saving to session
$query = $this->getDoctrine()->getManager()->createQueryBuilder();
$query->select("sp")
->from("CoreBundle:ServiceProvider","sp")
->innerJoin("sp.offers","offer")
->innerJoin("offer.service","service","with","offer.service = service")
->innerJoin("sp.firstImage","fi")
->andWhere("sp.city = :city_name")->setParameter("city_name",$cityName)
->orderBy("sp.points" ,"DESC")
->addOrderBy("sp.name" ,"ASC");
$queryAndFilters = $this->getFilters($query,$postData);
$query = $queryAndFilters['query'];
$filters=$queryAndFilters['filters'];
$paginator = $this->get('knp_paginator');
$pagination = $paginator->paginate(
$query, /* query NOT result */
$pageNumber,
20/*limit per page*/
);
$query = $query->getQuery();
$query->setHint(\Doctrine\ORM\Query::HINT_INCLUDE_META_COLUMNS, true);
$this->get('session')->set("results",$query->getResult());
and then in another function
filtering the results
$results = $this->get('session')->get("results");
$filteredResults = array();
// print_r(array_keys($results[0]));
foreach($results as $result){
$sp = $result;
foreach($sp->getOffers() as $offer){
// echo "found offer ".$offer->getName()." with price ".$offer->getPrice()."<br />";
$sp->removeOffer($offer);
if($offer->getPrice() < $minPrice || $offer->getPrice() > $maxPrice){
}else{
$sp->addOffer($offer);
// echo 'added $offer '.$offer->getName()." with price : ".$offer->getPrice()."<br />";
}
if(sizeof($sp->getOffers()) > 0 ){
array_push($filteredResults,$sp);
}
}
}
the first time i change the $minPrice and $maxPrice variables the results are filtered right and exactly what i need
but after raising the $maxPrice again the high prices are not being added to the $filteredResults
i tried also to assign $offer and $result to new variables but still not working
any idea how to fix this ?
ps. i can't change the query or to fetch them already with the query.

Answer 1

When you save entities in the session this entities are serialized with the values that actual at the serialization moment. Next changes of entities are not affect the stored values if you don't rewrite them in the session.
Also entitiy serializing has some limitations on private properties.