php graphviz

PHP Graphviz is a PHP extension that allows you to create and manipulate Graphviz graphs using PHP code. Graphviz is an open-source graph visualization software that can generate visual representations of graphs and networks. With PHP Graphviz, you can generate and customize graphs dynamically based on your data.

To use PHP Graphviz, you need to have the Graphviz software installed on your server. Once installed, you can install the PHP Graphviz extension using the PECL package manager or by compiling it from source.

Here is a basic example of how to use PHP Graphviz to create a simple graph:

<?php
$graph = new Graph();
$node1 = new Node('Node 1');
$node2 = new Node('Node 2');
$edge = new Edge($node1, $node2);

$graph->addNode($node1);
$graph->addNode($node2);
$graph->addEdge($edge);

$dot = $graph->render();
$dotFilePath = 'graph.dot';
file_put_contents($dotFilePath, $dot);

$imageFilePath = 'graph.png';
exec("dot -Tpng $dotFilePath -o $imageFilePath");

echo '<img src="' . $imageFilePath . '" alt="Graph">';
?>

In this example, we create a new Graph object and add two nodes and an edge to it. We then render the graph into the DOT format using the render() method and save it to a file called graph.dot. Finally, we use the exec() function to execute the dot command-line tool to convert the DOT file into a PNG image called graph.png, which is then displayed on the webpage.

This is just a simple example, and PHP Graphviz provides many more features and options for creating and customizing graphs. You can refer to the PHP Graphviz documentation for more information on how to use the extension and explore its capabilities.