How can i instantiate a class which is having private constructor

Question

How can i instantiate a class which is having private constructor.?

I don't want to use any function inside the class to create its own instance.

Ex class is :

class Test extends Test2 implements Test3 {
   private function __construct () {
   }

   function doDisplay() {
   }

   function Docall() {
   }
}

Answer 1

You can instanciate it using Reflection (PHP >= 5.4)

class Test {

    private $a;

    private function __construct($a)
    {
        $this->a = $a;
    }
}

$class = new ReflectionClass(Test::class);
$constructor = $class->getConstructor();
$constructor->setAccessible(true);
$object = $class->newInstanceWithoutConstructor();
$constructor->invoke($object, 1);

It works, but keep in mind that this was not an usage that the class was designed for, and that it might have some unforeseen side effects.

Answer 2

You can't invoke a private constructor from anywhere but within the class itself, so you have to use an externally-accessible static method to create instances.

Also, if Test2 has a constructor that isn't private, you can't make Test::__construct() private.