How to merge two php Doctrine 2 ArrayCollection()

Question

Is there any convenience method that allows me to concatenate two Doctrine ArrayCollection()? something like:

$collection1 = new ArrayCollection         


        

Answer 1

$newCollection = new ArrayCollection((array)$collection1->toArray() + $collection2->toArray()); 

This should be faster than array_merge. Duplicate key names from $collection1 are kept when same key name is present in $collection2. No matter what the actual value is