Doctrine\ODM\MongoDB\PersistentCollection::map PHP Method

    public function map(Closure $func)
    {
        $this->initialize();
        return $this->coll->map($func);
    }

 /**
  * Returns the collection representation to be stored and unschedules it afterwards.
  *
  * @param PersistentCollection $coll
  * @param bool $includeNestedCollections
  * @return array
  */
 public function prepareAssociatedCollectionValue(PersistentCollection $coll, $includeNestedCollections = false)
 {
     $mapping = $coll->getMapping();
     $pb = $this;
     $callback = isset($mapping['embedded']) ? function ($v) use($pb, $mapping, $includeNestedCollections) {
         return $pb->prepareEmbeddedDocumentValue($mapping, $v, $includeNestedCollections);
     } : function ($v) use($pb, $mapping) {
         return $pb->prepareReferencedDocumentValue($mapping, $v);
     };
     $setData = $coll->map($callback)->toArray();
     if (CollectionHelper::isList($mapping['strategy'])) {
         $setData = array_values($setData);
     }
     $this->uow->unscheduleCollectionDeletion($coll);
     $this->uow->unscheduleCollectionUpdate($coll);
     return $setData;
 }