use Doctrine\Common\Collections\ArrayCollection; $arr = new ArrayCollection(); $count = $arr->count(); echo $count; // Output: 0
use Doctrine\Common\Collections\ArrayCollection; $arr = new ArrayCollection(['apple', 'banana', 'cherry']); $count = $arr->count(); echo $count; // Output: 3In both examples, we create a new ArrayCollection instance and use the count() method to get the number of elements in the collection. Example 1 returns 0 as the collection is empty, whereas Example 2 returns 3 as the collection has three elements. Therefore, the package library used in these examples is Doctrine\Common\Collections.