YAML from .po

yamldumper.php

<?php
ini_set('display_errors', true);
require '../vendor/autoload.php';

use Symfony\Component\Translation\Loader\PoFileLoader,
    Symfony\Component\Translation\MessageCatalogue,
    Symfony\Component\Translation\Dumper\YamlFileDumper,    
    Symfony\Component\Translation\Dumper\XliffFileDumper;
use Symfony\Component\Yaml\Yaml;

class customYamlDumper extends YamlFileDumper
{
    /**
     * {@inheritDoc}
     */
    protected function format(MessageCatalogue $messages, $domain)
    {
         return Yaml::dump($messages->all($domain), 7, 4, true, true);
    }
}

$loader = new PoFileLoader();
$iterator = new FilesystemIterator(dirname(__FILE__) . "/srcpath");
$filter = new RegexIterator($iterator, '/\.(en\.po)$/');
foreach ($filter as $file) {
    $name = $file->getBasename('.po');
    list($domain, $locale) = explode('.', $name);
    $locale = 'fr';
    $array = $loader->load($file->getPathname(), $locale, $domain);
    $catalogue = new MessageCatalogue($locale);
    $catalogue->addCatalogue($array);

    $dumper = new XliffFileDumper();
    $dumper->dump($catalogue, array('path'=> __DIR__ . '/destPath'));
}
echo 'Done';