PHP Singleton pattern using traits

singletonTrait.php

<?php

trait Singleton
{
  private static $_instance;
  private function __construct(){}
 
  public function __clone()
  {
    throw new Exception('This object cannot be cloned!');
  }
 
  public static function getInstance()
  {
    if (null === static::$_instance) {
      static::$_instance = new static();
    }
    return static::$_instance;
  }
}
 
class Product
{
  use Singleton;
}
 
$product = Product::getInstance();