pdf_add_bookmark -- Adds bookmark for current page
Description
int pdf_add_bookmark ( resource pdfdoc, string text, int parent, int open )
Add a nested bookmark under parent, or a new top-level
bookmark if parent = 0. Returns a bookmark descriptor
which may be used as parent for subsequent nested bookmarks.
If open = 1, child bookmarks will be folded out, and
invisible if open = 0.
Parameters parent and open
are optional before PHP 4.3.5 or with PDFlib less than 5.