PHP code example of smoren / graph-tools

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

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

    

smoren / graph-tools example snippets

use Smoren\GraphTools\Models\Edge;
use Smoren\GraphTools\Models\Vertex;
use Smoren\GraphTools\Traverse\Traverse;
use Smoren\GraphTools\Traverse\TraverseDirect;
use Smoren\GraphTools\Traverse\TraverseReverse;
use Smoren\GraphTools\Filters\TransparentTraverseFilter;
use Smoren\GraphTools\Store\PreloadedGraphRepository;
use Smoren\GraphTools\Structs\FilterConfig;

$vertexes = [
    new Vertex(1, 1, null), // id, type, extra data
    new Vertex(2, 1, null),
    new Vertex(3, 1, null),
];
$connections = [
    new Edge(1, 1, 1, 2), // id, type, from id, to id
    new Edge(2, 1, 2, 3),
];

// Creating repository
$repo = new PreloadedGraphRepository($vertexes, $connections);

// Creating direct traverse model
$traverse = new TraverseDirect($repo);
$contexts = $traverse->generate(
    $repo->getVertexById(1),
    new TransparentTraverseFilter([FilterConfig::PREVENT_LOOP_PASS])
);

// Let's go traverse
$vertexIds = [];
foreach($contexts as $context) {
    $vertexIds[] = $context->getVertex()->getId();
}
print_r($vertexIds); // [1, 2, 3]

// Creating reverse traverse model
$traverse = new TraverseReverse($repo);
$contexts = $traverse->generate(
    $repo->getVertexById(3),
    new TransparentTraverseFilter([FilterConfig::PREVENT_LOOP_PASS])
);

// Let's go traverse
$vertexIds = [];
foreach($contexts as $context) {
    $vertexIds[] = $context->getVertex()->getId();
}
print_r($vertexIds); // [3, 2, 1]

$traverse = new Traverse($repo);

// Creating non-directed traverse model
$contexts = $traverse->generate(
    $repo->getVertexById(2),
    new TransparentTraverseFilter([FilterConfig::PREVENT_LOOP_PASS])
);

// Let's go traverse
$vertexIds = [];
$loopsCount = 0;
foreach($contexts as $context) {
    if($context->isLoop()) {
        $contexts->send(Traverse::STOP_BRANCH);
        ++$loopsCount;
    } else {
        $vertexIds[] = $context->getVertex()->getId();
    }
}
print_r($vertexIds); // [2, 3, 1]
var_dump($loopsCount); // 2

// Creating non-directed traverse model with loop prevent control
$contexts = $traverse->generate(
    $repo->getVertexById(2),
    new TransparentTraverseFilter([FilterConfig::PREVENT_LOOP_PASS, FilterConfig::PREVENT_LOOP_HANDLE])
);

// Let's go traverse
$vertexIds = [];
foreach($contexts as $context) {
    $vertexIds[] = $context->getVertex()->getId();
}
print_r($vertexIds); // [2, 3, 1]