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

Attention! Avoid large nesting of recursive elements. array_unique - has a recursive embedding limit and causes a PHP error Fatal error: Nesting level too deep - recursive dependency?

/**
 * @param ArrayCollection[] $arrayCollections
 *
 * @return ArrayCollection
 */
function merge(...$arrayCollections) {
    $listCollections = [];
    foreach ($arrayCollections as $arrayCollection) {
        $listCollections = array_merge($listCollections, $arrayCollection->toArray());
    }

    return new ArrayCollection(array_unique($listCollections, SORT_REGULAR));
}

// using
$a = new ArrayCollection([1,2,3,4,5,6]);
$b = new ArrayCollection([7,8]);
$c = new ArrayCollection([9,10]);

$result = merge($a, $b, $c);