new.deprecatedInterface

Code example

<?php declare(strict_types = 1);

/** @deprecated Use NewInterface instead */
interface OldInterface
{
}

$x = new OldInterface();

Why is it reported?

This error is reported by the phpstan-deprecation-rules extension.

A deprecated interface is used in a new expression. Deprecated interfaces are planned for removal in a future version.

Note: triggering this identifier requires instantiating an interface, which PHP does not allow. PHPStan therefore always also reports a new.interface error, and in practice the deprecation identifier is not reported alongside it.

How to fix it

Instantiate a concrete class that implements the replacement interface:

-$x = new OldInterface();
+$x = new ConcreteImplementation();