Hi Gerald,
If you did see something like that, it was a mistake in our manual :)
I've documented typehinting now, though it will take a while to show up in the manual.
http://php.net/language.oop5.typehinting
It may have been Example 18-23 at http://us2.php.net/manual/en/language.oop5.exceptions.php
Thanks for updating the manual...
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