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    <p>The class implementing the interface must use the exact same method signatures as are defined in the interface. Not doing so will result in a fatal error. And same rules for classes which extends abstract classes.</p> <p>Please, see in <a href="http://php.net/manual/en/language.oop5.interfaces.php" rel="nofollow">see in details here</a>, <a href="http://php.net/manual/en/language.oop5.abstract.php" rel="nofollow">see here too</a></p> <p>And this is right behaviour \ logic.</p> <p><a href="http://en.wikipedia.org/wiki/Abstract_class" rel="nofollow">check here</a> Abstract types are useful in that they can be used to define and enforce a protocol; a set of operations which all objects that implement the protocol must support.</p> <p>if we assume that your code will work without exception, then we have following problem: <code>ConcreteFooMapper</code> can't use instances of some <code>class ConcreteFoo2 implements Foo</code> as parameter for <code>load</code> method, but should (by Abstract class definition)</p> <p>Also, if you use same signature, it not a problem really, cause all class \ type info available. Please, check following code</p> <pre class="lang-php prettyprint-override"><code>&lt;?php interface Foo { public function foo(); } class ConcreteFoo implements Foo { public function foo() { } } abstract class AbstractFooMapper { abstract public function load(Foo $entity, array $data); } class ConcreteFooMapper extends AbstractFooMapper { public function load(Foo $entity, array $data) { var_dump($entity instanceof Foo); var_dump($entity instanceof ConcreteFoo); } } $someConcreteFoo = new ConcreteFoo(); $someFooMapper = new ConcreteFooMapper(); $someFooMapper-&gt;load($someConcreteFoo, array('somekey' =&gt; 'somevalue')); // output // bool(true) bool(true) ?&gt; </code></pre>
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    1. COAh. That makes sense. I was hoping to use type hinting to enforce only instances of `ConcreteFoo` being passed in the `load` method of `ConcreteFooMapper`but now I see how that breaks the protocol/contract. I'll just add the type check in at the beginning of the method using `instanceof`. It's what I've done in the past.
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