var obj_input = document.createElement("input");
        obj_input.type = "file";
        obj_input.accept = "image/png,image/jpeg";
        var element = document.getElementById("dropArea");
        element.addEventListener("dragover", function(e) {
            e.preventDefault();
            this.classList.add("dragover");
        });
        element.addEventListener("dragleave", function(e) {
            e.preventDefault();
            this.classList.remove("dragover");
        });
        element.addEventListener("drop", function(e) {
            e.preventDefault();
            element.classList.remove("dragover");
            if (/\.((png)|(jpeg)|(jpg))/i.test(e.dataTransfer.files[0].name) === true) {
                var obj = element;
                obj.innerHTML = e.dataTransfer.files[0].name;
                var imgfiles = e.dataTransfer.files;
                obj_input.files = imgfiles;
                var fr = new FileReader();
                fr.readAsDataURL(obj_input.files[0]);
                fr.onload = function() {
                    obj.style.backgroundImage = "url(" + fr.result + ")";
                    obj.style.backgroundSize = "cover";
                };
            }
        });

require_once '/vendor/autoload.php';
$loader = new \Twig\Loader\FilesystemLoader('テンプレートの階層を指定');
$twig = new \Twig\Environment($loader,['debug' => true]);
$twig->addExtension(new \Twig\Extension\DebugExtension());//?ここの記述を忘れずに！！
echo $twig->render('index.html（レンダーするテンプレートファイル）', ['items'=>$this->top_view()]);