GetDumpOrderCommand.php

<?php
namespace Seatfrog\WebservicesBundle\Command;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Tools\SchemaTool;
use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

function getDepth(ArrayCollection $set, $currentItem, $currentDepth) {
    $currentDepth++;
    $foreignKeys = $currentItem->getForeignKeys();
    if (sizeof($foreignKeys) == 0) {
        return $currentDepth;
    }
    $depths = new ArrayCollection();
    foreach ($foreignKeys as $foreignKey) {
        // Get the foreign table name
        $foreignName = $foreignKey->getForeignTableName();
        $target = $set->filter(function($o) use ($foreignName) {
            return $o->getName() == $foreignName;
        });
        $target = $target->first();
        $depths->add(getDepth($set, $target, $currentDepth));
    }
    return max($depths->toArray());
};

function sorter($a, $b) {
    return $a['depth'] > $b['depth'];
};

class GetDumpOrderCommand extends ContainerAwareCommand
{
    protected function configure()
    {
        $this->setName("seatfrog:dump-order");
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $em = $this->getContainer()->get("doctrine.orm.entity_manager");
        $metadatas = $em->getMetadataFactory()->getAllMetadata();
        $tool = new SchemaTool($em);
        $schema = $tool->getSchemaFromMetadata($metadatas);
        $command = "mysqldump --xml -u root -pPUTYOURPASSWORDHEREPLZ -h 127.0.0.1 DATABASENAMEGOESHERE ";

        $final = [];

        // Find the max depth
        foreach ($schema->getTables() as $table) {
            $depth = getDepth(new ArrayCollection($schema->getTables()), $table, 0);
            $final[] = [
                'table' => $table,
                'depth' => $depth,
            ];
        }

        uasort($final, function($a, $b) {
            return $a['depth'] > $b['depth'];
        });

        foreach ($final as $item) {
            $command .= $item['table']->getName()." ";
        }

        $output->writeln($command);
    }
}

Thanks !