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Example code of tacman/gcf-php

Informations about the package gcf-php

gcf-php

A PHP implementation of GCF (Graph Compact Format) — a token-efficient wire format for structured data designed for LLM agent loops. Lossless conversion to/from JSON, 50-92% fewer tokens depending on data shape.

GCF is specified and maintained by blackwell-systems/gcf, with reference implementations in Go, Rust, TypeScript, Python, Swift, and Kotlin. This is an independent PHP port, targeting spec version 3.5.1 (see spec/SPEC.md, vendored from the source commit noted in spec/SOURCE-COMMIT.txt). It was ported from gcf-python v2.3.0 and tracks its public API 1:1 — both profiles, delta encoding, session dedup, streaming, and the CLI.

Requirements

PHP 8.5+. Zero runtime dependencies — matching the other six official implementations' permanent zero-dependency commitment.

Usage

Generic profile — arbitrary structured data (tabular arrays, keyed maps, nested objects)

Graph profile — symbols/edges (code graphs, context packs)

Session dedup — reuse symbols as bare references across multiple calls

Delta encoding — send only what changed

Gcf\Generic\Delta\GenericDeltaSession automates the delta-vs-full-reanchor decision across turns (Reanchor::fixedN(n) / Reanchor::sizeGuard() policies).

Streaming — emit rows incrementally, zero buffering

Pack root — canonical content hash for delta base/new root comparisons

CLI

Conformance

tests/conformance/ is vendored from the spec repo's shared fixture suite (JSON files with input/expected/operation — the same fixtures used to validate the other 6 implementations). Five PHPUnit test classes cover every vendored fixture 1:1, split by concern:

Test class Fixture directories
ConformanceTest generic-profile full snapshot: arrays, attachments, containers, decode, errors-v2 (non-graph), flatten, inline-schema, keyed-map, keys, numbers, roots, scalar, whitespace
GraphConformanceTest graph-encode, graph-decode, graph-pack-root, graph-scoped errors-v2
GenericDeltaConformanceTest generic-delta, generic-delta-session, generic-pack-root
GraphDeltaSessionConformanceTest graph-delta, graph-session, malformed-delta error
StreamingConformanceTest streaming-v2

Run the whole suite: vendor/bin/phpunit.

License

MIT. See LICENSE. Format specification and prior art by Dayna Blackwell / blackwell-systems.

All versions of gcf-php with dependencies

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Requires php Version ^8.5
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