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MissingOverrideAttribute

Emitted when the config flag ensureOverrideAttribute is set to true and a method on a child class or interface overrides a method on a parent, but no Override attribute is present.

<?php

class A {
    function receive(): void
    {
    }
}

class B extends A {
    function receive(): void
    {
    }
}

Why this is bad

Having an Override attribute on overridden methods makes intentions clear. Read the PHP RFC for more details.