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mariopereira/php-shunting-yard
==============================

Fork of https://github.com/andig/php-shunting-yard

01PHP

Since Jan 18Pushed 3y agoCompare

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

READMEChangelogDependenciesVersions (1)Used By (0)

PHP Shunting Yard Implementation
--------------------------------

[](#php-shunting-yard-implementation)

### Example

[](#example)

Simple equation parsing

```
use RR\Shunt\Parser;

$equation = '3 + 4 * 2 / ( 1 - 5 ) ^ 2 ^ 3';
$result = Parser::parse($equation);
echo $result; //3.0001220703125
```

Equation with constants and functions

```
use RR\Shunt\Parser;
use RR\Shunt\Context;

$ctx = new Context();
$ctx->def('abs'); // wrapper for PHP "abs" function
$ctx->def('foo', 5); // constant "foo" with value "5"
$ctx->def('bar', function($a, $b) { return $a * $b; }); // define function

$equation = '3 + bar(4, 2) / (abs(-1) - foo) ^ 2 ^ 3';
$result = Parser::parse($equation, $ctx);
echo $result; //3.0001220703125
```

Test a condition

```
use RR\Shunt\Parser;
use RR\Shunt\Context;

$ctx = new Context();
$ctx->def('foo', 5); // constant "foo" with value "5"

$equation = '(foo > 3) & (foo < 6)';
$result = Parser::parse($equation, $ctx);
echo $result; //true
```

Re-run parsed expression on multiple inputs

```
use RR\Shunt\Parser;
use RR\Shunt\Context;

$counter = 1;
$ctx = new Context();
$ctx->def('data', function() { global $counter; return $counter++; }); // define function
$ctx->def('bar', function($a) { return 2*$a; }); // define function

$equation = 'bar(data())';
$parser = new Parser(new Scanner($equation));

$result = $parser->reduce($this->ctx); // first result
echo $result; // 2
$result = $parser->reduce($this->ctx); // second result
echo $result; // 4
```

### Installation

[](#installation)

Define the following requirement in your composer.json file:

```
{
    "require": {
        "mariopereira/php-shunting-yard": "dev-master"
    }
}
```

### Authors

[](#authors)

Forked from .

Originally source code taken from , some changes from:

-
-
-

Test cases and refactoring for composer/packagist by .

###  Health Score

14

—

LowBetter than 2% of packages

Maintenance20

Infrequent updates — may be unmaintained

Popularity1

Limited adoption so far

Community11

Small or concentrated contributor base

Maturity23

Early-stage or recently created project

 Bus Factor2

2 contributors hold 50%+ of commits

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/e8a6d7c5ff5c49b147d9dde17b5d5ad97bdaf763ac57ed216d9d943e36b78cb1?d=identicon)[mariopereira](/maintainers/mariopereira)

---

Top Contributors

[![andig](https://avatars.githubusercontent.com/u/184815?v=4)](https://github.com/andig "andig (25 commits)")[![sergej-kurakin](https://avatars.githubusercontent.com/u/196096?v=4)](https://github.com/sergej-kurakin "sergej-kurakin (15 commits)")[![pmishev](https://avatars.githubusercontent.com/u/5188763?v=4)](https://github.com/pmishev "pmishev (14 commits)")[![falahati](https://avatars.githubusercontent.com/u/2479372?v=4)](https://github.com/falahati "falahati (10 commits)")[![dmromanov](https://avatars.githubusercontent.com/u/299059?v=4)](https://github.com/dmromanov "dmromanov (1 commits)")

### Embed Badge

![Health badge](/badges/mariopereira-php-shunting-yard/health.svg)

```
[![Health](https://phpackages.com/badges/mariopereira-php-shunting-yard/health.svg)](https://phpackages.com/packages/mariopereira-php-shunting-yard)
```

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