Graphp

Graphp is a PHP library, which provides mathematical graph-theory objects and algorithms.

Installation

Install Graphp, using Composer:

composer require bingo-soft/graphp

Basic example

use Graphp\GraphUtils;
use Graphp\Graph\Types\SimpleWeightedGraph;
use Graphp\Edge\DefaultWeightedEdge;
use Graphp\Vertex\Vertex;
use Graphp\Alg\Shortestpath\DijkstraShortestPath;

// Create vertices
$v1 = new Vertex("v1");
$v2 = new Vertex("v2");
$v3 = new Vertex("v3");
$v4 = new Vertex("v4");
$v5 = new Vertex("v5");

// Create a new graph and add vertices
$graph = new SimpleWeightedGraph(DefaultWeightedEdge::class);
$graph->addVertex($v1);
$graph->addVertex($v2);
$graph->addVertex($v3);
$graph->addVertex($v4);
$graph->addVertex($v5);

// Add weighted edges to the graph
$e12 = GraphUtils::addEdge($graph, $v1, $v2, 2.0);
$e13 = GraphUtils::addEdge($graph, $v1, $v3, 3.0);
$e24 = GraphUtils::addEdge($graph, $v2, $v4, 5.0);
$e34 = GraphUtils::addEdge($graph, $v3, $v4, 20.0);
$e45 = GraphUtils::addEdge($graph, $v4, $v5, 5.0);
$e15 = GraphUtils::addEdge($graph, $v1, $v5, 100.0);

// Find shortest path between v1 and v2 using Dijkstra shortest path algorithm. Returns [$e12]
$path = (new DijkstraShortestPath($graph))->getPath($v1, $v2)->getEdgeList();

// Returns [$e12, $e24]
$path = (new DijkstraShortestPath($graph))->getPath($v1, $v4)->getEdgeList();

// Returns [$e12, $e24, $e45]
$path = (new DijkstraShortestPath($graph))->getPath($v1, $v5)->getEdgeList();

// Returns [$e13, $e12, $e24]
$path = (new DijkstraShortestPath($graph))->getPath($v3, $v4)->getEdgeList();

Features

Graph types
- Simple graph
- Simple weighted graph
- Simple directed graph
- Simple directed weighted graph
- ...
Algorithms
- Shortest path algorithms
  - Dijkstra shortest path

Dependencies

Graphp depends on Heap library.

Acknowledgements

Graphp draws inspiration from the JGraphT library.

License

MIT

bingo-soft / graphp