Error Identifier: new.interface

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

interface LoggerInterface
{
	public function log(string $message): void;
}

$logger = new LoggerInterface();

Why is it reported? #

PHP interfaces cannot be instantiated. An interface defines a contract that classes must implement, but it does not provide concrete implementations of its methods. Attempting to use new with an interface name will result in a fatal error at runtime.

How to fix it #

Instantiate a concrete class that implements the interface instead.

 <?php declare(strict_types = 1);
 
-$logger = new LoggerInterface();
+$logger = new FileLogger();

How to ignore this error #

You can use the identifier new.interface to ignore this error using a comment:

// @phpstan-ignore new.interface
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: new.interface

Rules that report this error #

PHPStan\Rules\Classes\InstantiationRule [1]

Edit this page on GitHub

Theme