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From manual page: http://www.php.net/language.oop5.visibility
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This sentence does not seem to be correct:
"Members declared protected can be accessed only within the class itself and by inherited classes."
I believe what the author meant is:
"Members declared protected can be accessed only within the class itself and by inheriting classes."

In other words: if class C extends class B which extends class A, then a protected member of B can be accessed by C. With the current text "inherited classes" suggest that class A can access protected members of B.