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Editorial Team
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Asked: 2026-05-13T20:45:39+00:00

I have code that looks like this: function foobar(array& $objects, $con = null) {

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I have code that looks like this:

function foobar(array& $objects, $con = null)
{
   if (is_null($con))
      $con = DbSingleton::getConnectio();

   $con->beginTransaction();  // <- question 1

   try
   {
     foreach($objects as $object)
     {
        // allocate memory for new object 
        $new_obj = new MyShiningNewObject();

        // do something to the new object ...
        $new_obj->setParentId($object->getId());
        $new_obj->save($con);

        // mark for garbage collection
        unset($new_obj);  // <- question 2
      }

     $con->commit();
  }
  catch(Exception $e){ $con->rollBack(); }      
}

My questions are:

  1. I am begining a transaction, this could well be a nested transaction. In the case of a nested transaction, if an exception is thrown and I rollback, how far back does the rollback go (to the outermost transaction) – common sense suggest that this should be the case, but one never knows.

  2. I am freeing memory (ok, marking as ‘freeable’ by the Zend GC). Since I am commiting the transaction AFTER the loop, (the variable is marked as frreable IN the loop), is this safe – I mean will the data be safely stored in the db even though I have unset the variable that the value came from?

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1 Answer

  1. Editorial Team

    To answer question 2 :

    • once the query has been sent to the database, what is done on PHP variables doesn’t matter anymore
    • the only thing you’ll do that will have an impact is when you’ll commit or rollback.
    • which means that unsetting the PHP variable will have no impact on the transactions/data on the DB side.

    About question 1 :

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