PHP code example of mbsoft31 / graph-core

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

mbsoft31 / graph-core example snippets

use Mbsoft\Graph\Domain\Graph;

// Create a directed graph
$graph = new Graph(directed: true);

// Add nodes with attributes
$graph->addNode('A', ['label' => 'Node A', 'color' => 'red']);
$graph->addNode('B', ['label' => 'Node B', 'color' => 'blue']);
$graph->addNode('C', ['label' => 'Node C', 'color' => 'green']);

// Add edges with weights
$graph->addEdge('A', 'B', ['weight' => 1.5]);
$graph->addEdge('B', 'C', ['weight' => 2.0]);
$graph->addEdge('C', 'A', ['weight' => 0.5]);

// Query the graph
echo count($graph->nodes()); // 3
echo count($graph->edges()); // 3

// Check connections
if ($graph->hasEdge('A', 'B')) {
    $weight = $graph->edgeAttrs('A', 'B')['weight'];
    echo "Edge A->B has weight: $weight\n";
}

// Get neighbors
$successors = $graph->successors('A');   // ['B']
$predecessors = $graph->predecessors('C'); // ['B']

use Mbsoft\Graph\Domain\Graph;

// Create an undirected graph
$graph = new Graph(directed: false);

$graph->addEdge('A', 'B', ['type' => 'friendship']);
$graph->addEdge('B', 'C', ['type' => 'friendship']);

// In undirected graphs, edges work both ways
$graph->hasEdge('A', 'B'); // true
$graph->hasEdge('B', 'A'); // true (same edge)

// Successors and predecessors are the same (neighbors)
$graph->successors('B');   // ['A', 'C']
$graph->predecessors('B'); // ['A', 'C']

use Mbsoft\Graph\Domain\Graph;

$edges = [
    ['A', 'B', ['weight' => 1.0]],
    ['B', 'C', ['weight' => 2.0]],
    ['C', 'D', ['weight' => 1.5]],
    ['D', 'A', ['weight' => 3.0]],
];

$graph = Graph::fromEdgeList($edges, directed: true);

use Mbsoft\Graph\Domain\Graph;
use Mbsoft\Graph\Domain\SubgraphView;

// Create a graph
$graph = new Graph();
$graph->addEdge('A', 'B');
$graph->addEdge('B', 'C');
$graph->addEdge('C', 'D');
$graph->addEdge('D', 'E');

// Create a view containing only nodes A, B, and C
$subgraph = new SubgraphView($graph, ['A', 'B', 'C']);

// The view only shows edges within the selected nodes
$subgraph->nodes();  // ['A', 'B', 'C']
$subgraph->edges();  // Only A->B and B->C edges
$subgraph->hasEdge('C', 'D'); // false (D not in view)

// Update node attributes (merge with existing)
$graph->addNode('A', ['new_attr' => 'value']);

// Replace all node attributes
$graph->setNodeAttrs('A', ['only' => 'this']);

// Update edge attributes
$graph->setEdgeAttrs('A', 'B', ['weight' => 5.0, 'label' => 'Strong']);

use Mbsoft\Graph\IO\CytoscapeJsonExporter;

$exporter = new CytoscapeJsonExporter();
$json = $exporter->export($graph);

// Result structure:
// [
//     'elements' => [
//         'nodes' => [
//             ['data' => ['id' => 'A', 'label' => 'Node A', ...]],
//             ...
//         ],
//         'edges' => [
//             ['data' => ['source' => 'A', 'target' => 'B', 'weight' => 1.5]],
//             ...
//         ]
//     ]
// ]

file_put_contents('graph.json', json_encode($json));

use Mbsoft\Graph\IO\GraphMLExporter;

$exporter = new GraphMLExporter();
$xml = $exporter->export($graph);

file_put_contents('graph.graphml', $xml);

use Mbsoft\Graph\IO\GexfExporter;

$exporter = new GexfExporter();
$xml = $exporter->export($graph);

file_put_contents('graph.gexf', $xml);

$socialNetwork = new Graph(directed: false);

// Add users
$socialNetwork->addNode('alice', ['name' => 'Alice', 'age' => 28]);
$socialNetwork->addNode('bob', ['name' => 'Bob', 'age' => 32]);
$socialNetwork->addNode('charlie', ['name' => 'Charlie', 'age' => 25]);

// Add friendships
$socialNetwork->addEdge('alice', 'bob', ['since' => '2020']);
$socialNetwork->addEdge('bob', 'charlie', ['since' => '2019']);

// Find friends of friends
$bobsFriends = $socialNetwork->successors('bob'); // ['alice', 'charlie']

$tasks = new Graph(directed: true);

// Add tasks
$tasks->addNode('compile', ['duration' => 30]);
$tasks->addNode('test', ['duration' => 45]);
$tasks->addNode('package', ['duration' => 15]);
$tasks->addNode('deploy', ['duration' => 20]);

// Add dependencies
$tasks->addEdge('compile', 'test');
$tasks->addEdge('test', 'package');
$tasks->addEdge('package', 'deploy');

// Find what needs to be done before deployment
$deployPrereqs = $tasks->predecessors('deploy'); // ['package']

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