PHPackages                             igorw/ilias - PHPackages - PHPackages  [Skip to content](#main-content)[PHPackages](/)[Directory](/)[Categories](/categories)[Trending](/trending)[Leaderboard](/leaderboard)[Changelog](/changelog)[Analyze](/analyze)[Collections](/collections)[Log in](/login)[Sign up](/register)

1. [Directory](/)
2. /
3. [Utility & Helpers](/categories/utility)
4. /
5. igorw/ilias

ActiveLibrary[Utility & Helpers](/categories/utility)

igorw/ilias
===========

Naive LISP implementation in PHP.

2394[1 issues](https://github.com/igorw/ilias/issues)[1 PRs](https://github.com/igorw/ilias/pulls)PHP

Since Jan 29Pushed 4y ago2 watchersCompare

[ Source](https://github.com/igorw/ilias)[ Packagist](https://packagist.org/packages/igorw/ilias)[ RSS](/packages/igorw-ilias/feed)WikiDiscussions master Synced 1mo ago

READMEChangelogDependenciesVersions (2)Used By (0)

Ilias
=====

[](#ilias)

Naive LISP implementation in PHP. For something more complete, check out [Lisphp](https://github.com/lisphp/lisphp).

Check out the [s-expression blog posts](https://igor.io/2012/12/06/sexpr.html)explaining the implementation of Ilias.

Usage
-----

[](#usage)

```
use Igorw\Ilias\Program;
use Igorw\Ilias\Lexer;
use Igorw\Ilias\Reader;
use Igorw\Ilias\FormTreeBuilder;
use Igorw\Ilias\Walker;
use Igorw\Ilias\Environment;

$program = new Program(
    new Lexer(),
    new Reader(),
    new FormTreeBuilder(),
    new Walker()
);

$env = Environment::standard();
$value = $program->evaluate($env, '(+ 1 2)');
var_dump($value);
```

will output:

```
int(3)

```

###  Health Score

24

—

LowBetter than 32% of packages

Maintenance19

Infrequent updates — may be unmaintained

Popularity15

Limited adoption so far

Community13

Small or concentrated contributor base

Maturity43

Maturing project, gaining track record

 Bus Factor1

Top contributor holds 97.5% of commits — single point of failure

How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window.

**Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores.

**Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement.

**Maturity (30%)** — Project age, version count, PHP version support, and release stability.

### Community

Maintainers

![](https://www.gravatar.com/avatar/3afcc18d00fff840775bbf9570b3e9cd3997ca4820b9bfb14caf6da3ae580370?d=identicon)[igorw](/maintainers/igorw)

---

Top Contributors

[![igorw](https://avatars.githubusercontent.com/u/88061?v=4)](https://github.com/igorw "igorw (119 commits)")[![edorian](https://avatars.githubusercontent.com/u/247397?v=4)](https://github.com/edorian "edorian (2 commits)")[![pborreli](https://avatars.githubusercontent.com/u/77759?v=4)](https://github.com/pborreli "pborreli (1 commits)")

### Embed Badge

![Health badge](/badges/igorw-ilias/health.svg)

```
[![Health](https://phpackages.com/badges/igorw-ilias/health.svg)](https://phpackages.com/packages/igorw-ilias)
```

PHPackages © 2026

[Directory](/)[Categories](/categories)[Trending](/trending)[Changelog](/changelog)[Analyze](/analyze)