Description:
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From manual page: http://www.php.net/language.oop5.interfaces
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Second paragraph says:
"Interfaces are defined using the interface keyword, in the same way as a standard class, but without any of the methods having their contents defined."

However, that term standard class here does not mean a php standard class, which was confusing to me. I believe it means a regular or normal class type as opposed to an interface class.

I'm not sure how to word it better, but below is possible wording.
"Interfaces are defined using the interface keyword, in the same way as any regularly defined class (i.e., using the "class" command), but without any of the methods having their contents defined."