(PHP 4 >= 4.0.5, PECL pdflib:1.0-2.1.3)
PDF_add_note — Set annotation for current page [deprecated]
Sets an annotation for the current page. 如果成功则返回 TRUE,失败则返回 FALSE。
This function is deprecated since PDFlib version 6, use PDF_create_annotation() with type=Text instead.