Drupal 9 - 代码修改不生效

Question

I am trying to debug some code on my Drupal 9 application.

For example, at the file web/index.php , I try to add die('Was here')

<?php 

    use Drupal\Core\DrupalKernel;
    use Symfony\Component\HttpFoundation\Request;

    $autoloader = require_once 'autoload.php';

    //My code is here
    die('Was here');

    $kernel = new DrupalKernel('prod', $autoloader);

    $request = Request::createFromGlobals();
    $response = $kernel->handle($request);
    $response->send();
    $kernel->terminate($request, $response);

At first, I got the result on my browser. Next I delete this die function, and when i refresh my browser, I get the same as before as if I didn't change the code

After some minutes, the expected result is shown in my browser. So weird

So I am wondering why is Drupal isn't taking that code change into account.

Btw, I run the command drush cr but it didn't change anything

Answer 1

That sounds like PHP OpCode Cache. You can see if its enabled or not in the Drupal status report under "PHP OPcode caching". There's a page on on disabling Drupal Caching [here][1] which includes a section on opcache. I believe to disable opcache you can add an entry to your php.ini file.

opcache.enable=0

Be sure to restart relevant services like php-fpm. And verify it was effective in the Drupal status report. [1]: https://www.drupal.org/node/2598914