Description:
------------
---
From manual page: http://www.php.net/function.is-subclass-of#refsect1-function.is-
subclass-of-changelog
---


The documentation should somehow make the reader aware that is_subclass_of did not 
work reliable with interfaces before 5.3.9 when https://bugs.php.net/bug.php?
id=53727 and https://bugs.php.net/bug.php?id=55475 where fixed.

It should maybe point the reader to class_implements() for a way to realiable 
check that a class name (string) implements  a given interface.

Test script:
---------------
<?php

interface MyInterface {}
class MyClass implements MyInterface {}

// This will fail on 5.3.8 and earlier, this has been fixed
// in #53727, but doc does not reflect that.

echo (is_subclass_of('MyClass', 'MyInterface') ? 'true' : 'false');

Expected result:
----------------
true

Actual result:
--------------
false