Stanislav Malyshev wrote:
I think the only serious advantage I could see would be to allow context-assistance IDEs more data, so they could provide method-completion.

PHPDoc does that with @return tag.

True but there will be times when the documentation is wrong[1] or when the function returns something that it shouldn't.

Again, this really has little to do with IDEs. It is aimed improving the interface language construct.

[1]http://bugs.php.net/bug.php?id=38402

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