The usefulness of destructive

PHP
1

Hello,
I want to know the real use constructors in PHP.
I found some classes in PHP with a destructor that destroys all the attributes of objects in the destructor with unset
Example:

<?php
class MyClass
{

private $object1, $object2, $object3;

public function __construct()
{
  $this->object1 = new ClassBB;
  $this->object2 = new SampleClass;
  $this->object3 = new Example;
}


// Content Class


public function __destruct()
{
  unset($this->object1, $this->object2, $this->object3);
}

}

Is that going it change something in performance of PHP?
Otherwise what is the destructor in PHP?

Thank you

2

If those classes were taken up big chunk of memory and are no longer needed then unsetting them will most likely improve performance. I don’t think there are other benefits.

3

It’s is completely unnecessary and make no difference.
The objects that are instance variables are going to be picked up by GC as soon as the object itself is destroyed by GC.

4