https://demos.setasign.com/
SetaPDF Demos
PHP demos of SetaPDF - modify, handle and create PDFs in pure PHP.
demos
https://manuals.setasign.com/api-reference/setapdf/c/setasign.SetaPDF2.Core.Document.Page.Annotation.Flags
Class Flags in namespace setasign\SetaPDF2\Core\Document\Page\Annotation in SetaPDF v2 API Reference