用Yii2做的项目在部署到云服务器后访问无反应，也没有任何数据响应

Question

输入地址后一直在等待响应
经过检查，代码在跑到\vendor\yiisoft\yii2\base\View.php

public function renderFile($viewFile, $params = [], $context = null)
    {
        $viewFile = Yii::getAlias($viewFile);

        if ($this->theme !== null) {
            $viewFile = $this->theme->applyTo($viewFile);
        }
        if (is_file($viewFile)) {
            $viewFile = FileHelper::localize($viewFile);
        } else {
            throw new ViewNotFoundException("The view file does not exist: $viewFile");
        }

        $oldContext = $this->context;
        if ($context !== null) {
            $this->context = $context;
        }
        $output = '';
        $this->_viewFiles[] = $viewFile;
        if ($this->beforeRender($viewFile, $params)) {
            Yii::trace("Rendering view file: $viewFile", __METHOD__);
            $ext = pathinfo($viewFile, PATHINFO_EXTENSION);
            if (isset($this->renderers[$ext])) {
                if (is_array($this->renderers[$ext]) || is_string($this->renderers[$ext])) {
                    $this->renderers[$ext] = Yii::createObject($this->renderers[$ext]);
                }
                /* @var $renderer ViewRenderer */
                $renderer = $this->renderers[$ext];
                $output = $renderer->render($this, $viewFile, $params);
            } else {
                $output = $this->renderPhpFile($viewFile, $params);
            }
            $this->afterRender($viewFile, $params, $output);
        }

        array_pop($this->_viewFiles);
        $this->context = $oldContext;
        return $output;
    }

在$output = $this->renderPhpFile($viewFile, $params)那行卡住了
从这个方法`public function renderPhpFile($_file_, $params = [])

{
    ob_start();
    ob_implicit_flush(false);
    extract($_params_, EXTR_OVERWRITE);
    require($_file_);
    
    return ob_get_clean();
}`
来看，应该是生成变量然后读取视图文件再输出，但我水平实在不够，不明白为何会卡住而不报错