new.privateConstructor

Code example

<?php declare(strict_types = 1);

class Singleton
{
	private function __construct()
	{
	}

	public static function create(): self
	{
		return new self();
	}
}

new Singleton(); // ERROR: Cannot instantiate class Singleton via private constructor Singleton::__construct().

Why is it reported?

A class with a private constructor is being instantiated from outside the class (or from a context that does not have access to the private constructor). A private constructor restricts instantiation to within the class itself, which is a common pattern for singletons, factory methods, or named constructors. Attempting to call new on such a class from outside will cause a fatal error at runtime.

How to fix it

Use the provided factory method or named constructor instead of calling new directly:

 <?php declare(strict_types = 1);

-new Singleton();
+Singleton::create();

Or if the constructor should be accessible from outside the class, change its visibility:

 <?php declare(strict_types = 1);

 class Singleton
 {
-	private function __construct()
+	public function __construct()
 	{
 	}
 }