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

    public function removeElement($element)
    {
        $this->initialize();
        $removed = $this->coll->removeElement($element);
        if ($removed) {
            $this->changed();
            if ($this->mapping !== null && isset($this->mapping['embedded'])) {
                $this->dm->getUnitOfWork()->scheduleOrphanRemoval($element);
            }
        }
        return $removed;
    }

 /**
  * {@inheritdoc}
  */
 public function removeElement($element)
 {
     return $this->collection->removeElement($element);
 }