parameter.missing

Code example

<?php declare(strict_types = 1);

class Base
{
	public function doFoo(string $name, int $age): void
	{
	}
}

class Child extends Base
{
	public function doFoo(string $name): void
	{
	}
}

Why is it reported?

An overriding method is missing a parameter that exists in the parent method. When a child class overrides a method, it must accept at least the same parameters as the parent method. Removing a parameter from an overriding method violates the Liskov Substitution Principle -- code that calls the parent method with all its parameters would break when given an instance of the child class.

How to fix it

Add the missing parameter to the overriding method:

 class Child extends Base
 {
-	public function doFoo(string $name): void
+	public function doFoo(string $name, int $age): void
 	{
 	}
 }