Instances of classes that do not derive from the "Throwable" interface cannot be used in a PHP "throw" statement.
Many built-in exceptions such as "Exception" and the SPL exception classes do implement the "Throwable" interface and can be extended when creating
custom exceptions.
This rule raises an issue when an instance of a class that does not implement the "Throwable" interface is used in a "throw" statement .
Noncompliant code example
class NoThrowable {}
throw new NoThrowable(); // Noncompliant
Compliant solution
<?php
class SomeThrowable implements Throwable {
// Implementation of the Throwable methods
}
throw new SomeThrowable(); // Compliant
class SomeCustomException extends Exception {}
throw new SomeCustomException(); // Compliant{code}
