Dump a Symfony Standard Edition DI container

dump.php

<?php

/**
 * @license MIT
 */

$loader = require_once __DIR__.'/bootstrap.php.cache';
require_once __DIR__.'/AppKernel.php';

use Symfony\Component\Config\ConfigCache;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Dumper\GraphvizDumper;

class DumperKernel extends \AppKernel
{
    private $containerGraph;

    protected function dumpContainer(ConfigCache $cache, ContainerBuilder $container, $class, $baseClass)
    {
        $dumper = new GraphvizDumper($container);

        $this->containerGraph = $dumper->dump(['graph' => ['rankdir' => 'RL']]);
        
        parent::dumpContainer($cache, $container, $class, $baseClass);
    }

    public function dump()
    {
        $this->boot();

        return $this->containerGraph;
    }
}

$kernel = new DumperKernel('dev', true);
echo $kernel->dump();