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parseFileToDOM example

class XmlFileLoader extends FileLoader
{
    public const NS = 'http://symfony.com/schema/dic/services';

    protected $autoRegisterAliasesForSinglyImplementedInterfaces = false;

    public function load(mixed $resource, string $type = null): mixed
    {
        $path = $this->locator->locate($resource);

        $xml = $this->parseFileToDOM($path);

        $this->container->fileExists($path);

        $this->loadXml($xml, $path);

        if ($this->env) {
            $xpath = new \DOMXPath($xml);
            $xpath->registerNamespace('container', self::NS);
            foreach ($xpath->query(sprintf('//container:when[@env="%s"]', $this->env)) ?: [] as $root) {
                $env = $this->env;
                $this->env = null;