The SetaPDF-Core component is the root of all other SetaPDF components. See how you can interact with PDF documents on a low level in pure PHP.
Extract text and words with their coordinates in PDF documents with the SetaPDF-Extractor component.
Access, fill and flatten PDF forms (aka AcroForms) with the SetaPDF-FormFiller component. See also how you can deal with XFA form in pure PHP.
See how to concatenate PDF documents in pure PHP. You also can create PDF Portfolios (aka PDF Packages or Collections) with the SetaPDF-Merger component.
Digital sign PDF documents in pure PHP with the SetaPDF-Signer component. Check out different signature modules, appearances or how to implement external signature providers.
Add new content to existing PDF documents without changing their internal structure or loosing any functionality.