pdf_attach_file
Description
bool pdf_attach_file ( resource pdfdoc, float llx, float lly, float urx, float ury, string filename, string description, string author, string mimetype, string icon)Add a file attachment annotation. icon is one of graph, paperclip, pushpin, or tag. 如果成功则返回 TRUE，失败则返回 FALSE。
注: Only the 'Full' Acrobat software will be able to display these file attachments. All other PDF viewers will either show nothing or display a question mark.