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Informations about the package swiss-ephemeris-ffi

Swiss Ephemeris PHP FFI

PHP Version Latest Version on Packagist Total Downloads

PHP 8.3+ FFI wrapper for the Swiss Ephemeris C library.

This package is designed to expose the Swiss Ephemeris C API to PHP through FFI, without shelling out to the swetest command-line tool.

Zero abstraction. Native-level FFI. Verified output parity with Swiss Ephemeris C engine.

Swiss Ephemeris PHP FFI provides a zero-abstraction, 1:1 mapping of the native Swiss Ephemeris C library. All 106 public API functions are exposed with complete constant and signature parity.

The wrapper performs no additional calculations, transformations, or rounding, ensuring direct memory-level interaction with the C engine.

Outputs are verified against the official swetest CLI using automated PHPUnit tests, demonstrating bit-level parity in verified test scenarios for planetary positions, house systems, eclipses, and edge-date calculations.

Latest Upstream Status

Checked against upstream on April 25, 2026.

See UPSTREAM_SYNC.md for detailed version tracking.

Requirements

Installation

Quick Start

Performance Audit

We have conducted a rigorous side-by-side benchmark comparing this FFI implementation against the native php-sweph C-extension.

View the Interactive Performance Audit →

The audit demonstrates bit-perfect accuracy and highly competitive performance across all 106 Swiss Ephemeris functions.

Documentation

Read the full documentation →

The documentation covers:

Verification Sources

License

This package metadata declares AGPL-3.0-or-later.

The upstream Swiss Ephemeris C library and ephemeris data are distributed under Astrodienst's dual licensing model: AGPL or Swiss Ephemeris Professional License. If you use Swiss Ephemeris in commercial or closed-source software, or in a public SaaS/web service, review Astrodienst's license terms before use.

All versions of swiss-ephemeris-ffi with dependencies

PHP Build Version
Package Version
Requires php Version ^8.3
ext-ffi Version *
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