throw.notThrowable

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();