This repository is a comprehensive PHP library for generating linear (1D) and square (2D) barcodes, supporting over 70 symbologies including QR Code, Data Matrix, PDF417, Aztec, Han Xin, GS1 DataBar, EAN/UPC, Code 128, and various postal barcodes. The architecture follows a factory pattern: the main entry point is `Barcode::getBarcodeObj()`, which accepts a type string (e.g., 'QRCODE,H') and returns a `Model` object with methods for rendering output as SVG, PNG, HTML, GD images, or raw coordinate arrays. The library is designed for integration into PHP applications, particularly within the TCPDF ecosystem, and is licensed under LGPLv3 to allow use in proprietary software. The codebase is well-structured with abstract base classes (`Type`, `Linear`, `Square`), traits for shared logic (e.g., `FixedLengthCheckDigit`, `HibcPayload`), and dedicated encoding pipelines for each symbology. Key reusable components include a generic Reed-Solomon error correction class, a math helper with bcmath fallback, and data compaction modules for GS1 and other standards. The library has extensive test coverage with PHPUnit, including round-trip encoding/decoding tests and verification against published reference symbols from ISO and other standards. External dependencies are minimal: only `tecnickcom/tc-lib-color` is required; optional extensions include `bcmath` for arbitrary-precision arithmetic, `gd` for PNG output, and `imagick` for additional image processing. The library is actively maintained (copyright 2001-2026) and uses modern PHP 8.2+ features such as enums, match expressions, and typed properties. The single maintainer and large number of hand-coded data tables (e.g., alignment patterns, error correction blocks) present a bus-factor risk, but the code quality and testing are solid.
TCPDF is a PHP library for programmatic PDF generation, originally a monolithic single-file engine. The current version (7.0.7) is a compatibility facade that delegates all rendering to the modern `tecnickcom/tc-lib-pdf` engine, preserving the legacy 291-method public API while the internal engine is replaced. The library is explicitly deprecated and in maintenance-only mode; users are encouraged to migrate to `tc-lib-pdf` directly. It provides a comprehensive set of features for creating PDF documents: text and HTML rendering, images, barcodes (1D and 2D), forms, digital signatures, encryption, PDF/A compliance, and more. The codebase includes a rich test suite (PHPUnit) with a reusable base test class, a smoke test runner for all 68 example scripts, and a method-mapping tool that generates the authoritative documentation of delegation status. The deposit is a library, not a standalone application, and is intended to be integrated into PHP applications via Composer.