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Error Identifier: new.abstract

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);

abstract class Foo
{
	abstract public function doSomething(): void;
}

$foo = new Foo(); // error: Instantiated class Foo is abstract.

Why is it reported? #

Abstract classes cannot be instantiated directly in PHP. They are meant to be extended by concrete (non-abstract) subclasses that implement all abstract methods. Attempting to use new on an abstract class will result in a fatal error at runtime.

How to fix it #

Create a concrete subclass that implements all abstract methods and instantiate that instead.

 abstract class Foo
 {
 	abstract public function doSomething(): void;
 }

+class ConcreteFoo extends Foo
+{
+	public function doSomething(): void
+	{
+		// implementation
+	}
+}
+
-$foo = new Foo();
+$foo = new ConcreteFoo();

How to ignore this error #

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

// @phpstan-ignore new.abstract
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.abstract

Rules that report this error #

• PHPStan\Rules\Classes\InstantiationRule [1]

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