Description:
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From manual page: http://www.php.net/function.xml-set-start-namespace-decl-handler
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Hi! :) I'm a spanish translator of php, I've post a comment with a code example in "User Contributed Notes" of this function and then I've seen the following:

This function does not have the attribute $user_data, in the explanation appears:

HANDLING.
handler ( resource $parser , string $user_data , string $prefix , string $uri )

the correct is:
handler ( resource $parser , string $prefix , string $uri )

and the below box of $user_data is not necessary