Packages

phpdftk is a monorepo with 15 packages. Each has its own Composer name, PSR-4 namespace, and can be installed independently.

Dependency graph

geometry, color, filters, encoding, font-metrics,
font-parser, image-metadata, xmp, crypt
    |
    v (all depended on by)
  pdf-core
    |
    +-- pdf-writer (Level 1 + Level 2 APIs)
    +-- pdf-reader (parser + text extraction)
    +-- pdf-toolkit (reader-to-writer pipelines)
    +-- pdf-conformance (ISO standard validation; also depends on xmp)

pdf-writer and pdf-reader never depend on each other. pdf-toolkit depends on pdf-core and pdf-reader but not pdf-writer. pdf-conformance depends on pdf-core and xmp.

PDF packages

Package	Composer	Namespace	Purpose
pdf/all	phpdftk/pdf	—	Metapackage: installs core + writer + reader
pdf/core	phpdftk/pdf-core	Phpdftk\Pdf\Core\	Object model + file serialization
pdf/writer	phpdftk/pdf-writer	Phpdftk\Pdf\Writer\	Level 1 (PdfWriter) + Level 2 (Pdf) APIs
pdf/reader	phpdftk/pdf-reader	Phpdftk\Pdf\Reader\	PDF parser with text extraction
pdf/toolkit	phpdftk/pdf-toolkit	Phpdftk\Pdf\Toolkit\	High-level manipulation pipelines
pdf/conformance	phpdftk/pdf-conformance	Phpdftk\Pdf\Conformance\	ISO standard validation (PDF/A, PDF/X, PDF/UA, PDF/VT, PDF/E, PDF/R, ZUGFeRD, PDF/mail)

Support packages

These have zero PDF dependencies and can be used standalone in any PHP project:

Package	Composer	Namespace	Purpose
geometry	phpdftk/geometry	Phpdftk\Geometry\	Rectangle, Matrix, PageSize, BezierCurve
color	phpdftk/color	Phpdftk\Color\	RGB, CMYK, Gray with conversions
filters	phpdftk/filters	Phpdftk\Filters\	FlateDecode, ASCII85, ASCIIHex, RunLength, LZW, CCITTFax, JBIG2, Predictor
encoding	phpdftk/encoding	Phpdftk\Encoding\	WinAnsi, MacRoman, Adobe Glyph List, CMap parser
font-metrics	phpdftk/font-metrics	Phpdftk\FontMetrics\	AFM data for all 14 standard PDF fonts
font-parser	phpdftk/font-parser	Phpdftk\FontParser\	TrueType/OpenType parsing, subsetting, kerning, ligatures
image-metadata	phpdftk/image-metadata	Phpdftk\ImageMetadata\	JPEG, PNG, GIF, TIFF, WebP header parsing
xmp	phpdftk/xmp	Phpdftk\Xmp\	XMP metadata packet read/write
crypt	phpdftk/crypt	Phpdftk\Crypt\	AES-128/256, RC4, PDF key derivation, PKCS#7