← Back to throw.*

Error Identifier: throw.notThrowable

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);

throw 123;

Why is it reported? #

PHP only allows throwing objects that implement the Throwable interface. Attempting to throw a value of any other type (such as int, string, or an object that does not implement Throwable) will result in a fatal error at runtime.

In the example above, an integer is used in a throw statement, which is not a valid throwable value.

How to fix it #

Throw an instance of a class that implements Throwable, such as Exception or RuntimeException:

-throw 123;
+throw new \RuntimeException('Something went wrong');

If using a custom class, make sure it extends Exception or implements Throwable:

-class MyError
+class MyError extends \RuntimeException
 {
 }

 throw new MyError();

How to ignore this error #

You can use the identifier throw.notThrowable to ignore this error using a comment:

// @phpstan-ignore throw.notThrowable
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: throw.notThrowable

Rules that report this error #

• PHPStan\Rules\Exceptions\ThrowExprTypeRule [1]

Edit this page on GitHub