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Error Identifier: catch.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);

class NotAnException
{
}

try {
	// ...
} catch (NotAnException $e) {
	// ...
}

Why is it reported? #

PHP only allows catching classes that implement the Throwable interface. All exception classes must either extend \Exception (which implements Throwable) or directly implement Throwable. Attempting to catch a class that does not implement Throwable will result in a fatal error.

In the example above, NotAnException is a regular class that does not extend \Exception or implement \Throwable, so it cannot be used in a catch block.

How to fix it #

Make the class extend \Exception or one of its subclasses:

 <?php declare(strict_types = 1);
 
-class NotAnException
+class NotAnException extends \RuntimeException
 {
 }

 try {
 	// ...
 } catch (NotAnException $e) {
 	// ...
 }

Alternatively, if this class should not be an exception, catch the correct exception class instead:

 <?php declare(strict_types = 1);
 
 try {
 	// ...
-} catch (NotAnException $e) {
+} catch (\RuntimeException $e) {
 	// ...
 }

How to ignore this error #

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

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

Rules that report this error #

• PHPStan\Rules\Exceptions\CaughtExceptionExistenceRule [1]

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