note 80106 added to function.empty

Also, it doesn't appear to mention in the documentation, if a variable hasn't previously been declared, empty also returns true.

E.g.
var $bar;
empty( $bar ); // declared variable returns true.
empty( $foo ); // undeclared variable also returns true.

The closest the documentation comes to saying this is:
"var $var; (a variable declared, but without a value in a class)"
which isn't really the same, as the variable doesn't necessarily have to be declared first.
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Manual Page -- http://www.php.net/manual/en/function.empty.php
Edit        -- https://master.php.net/note/edit/80106
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