catch.notThrowable

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) {
 	// ...
 }