Interpetrar XML no PHP

                <form action="{{ path(''peopleupload'') }}" class="" method="post" enctype="multipart/form-data">
                    <div class="form-group">
                        <label>Enviar XML</label>
                        <input type="file" name="file" multiple class="form-control">
                    </div>
                    <div class="form-group text-center" >
                        <button type="submit" class="btn btn-lg btn-success">Enviar</button>
                    </div>
                </form>

public function people_upload(Request $request)
    {
        $xmls = simplexml_load_file($request) or die("Error: Cannot create object");

        print "<pre>";
        var_dump($xmls);

        return new Response(''Teste...'');
    }