Warning: Undefined array key 1 in template_preprocess_html()

Arun.k → changed the visibility of the branch 11.x to hidden.

Arun.k → changed the visibility of the branch 11.x to active.

Tagging for steps as just install drupal isn't triggering it.

Will need to research why the value isn't there vs a check. Don't want to mask a larger issue.

The steps to reproduce are accurate from my original post for 10.3.0-rc1. I have installed it on simplytest.me and locally on ddev and can get the warning right away with the steps already outlined.

11.x is the current development branch so fixes need to land there first and be proven there also, just FYI

Ah, is there a reason all the past dev versions can still be selected for new issues? It's confusing when creating a new issue to have them available to select when you say issues and fixes need to be based in the latest dev version. The others should not be available to select. Perhaps I'll open an issue about that for improving Drupal issue reporting user experience.

For this issue, I'll take a look at 11 and report back if I can reproduce or if this issue can be closed.

If fixed in 11.x but not 10.3 then should find out if something was committed that maybe didn't get backported.

Ah, is there a reason all the past dev versions can still be selected for new issues?

I am sure there is an issue about that.

Will say occasionally there are issues that target older branches. But know almost all have to land in 11.x first.

Also 11. is just the name because "main" couldn't be used.

Confirmed on Drupal 11.0-dev. I installed on DDEV v1.23.2 with PHP 8.3.8 using:
ddev composer create drupal/recommended-project:11.x-dev@dev

Using the same steps to reproduce in the original post, I get this warning:

Warning: Undefined array key 1 in template_preprocess_html() (line 1176 of core/includes/theme.inc).
template_preprocess_html(Array, 'html', Array)
call_user_func_array('template_preprocess_html', Array) (Line: 261)
Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 446)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 203)
Drupal\Core\Render\Renderer->render(Array) (Line: 158)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 593)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 153)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) (Line: 246)
Symfony\Component\EventDispatcher\EventDispatcher::Symfony\Component\EventDispatcher\{closure}(Object, 'kernel.view', Object) (Line: 206)
Symfony\Component\EventDispatcher\EventDispatcher->callListeners(Array, 'kernel.view', Object) (Line: 56)
Symfony\Component\EventDispatcher\EventDispatcher->dispatch(Object, 'kernel.view') (Line: 188)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 2) (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 2, 1) (Line: 53)
Drupal\Core\StackMiddleware\Session->handle(Object, 2, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 2, 1) (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle(Object, 2, 1) (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle(Object, 2, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 2, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 2, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 2, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 2, 1) (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 2, 1) (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 2) (Line: 166)
Drupal\Core\EventSubscriber\DefaultExceptionHtmlSubscriber->makeSubrequest(Object, '/system/404', 404) (Line: 122)
Drupal\Core\EventSubscriber\DefaultExceptionHtmlSubscriber->on404(Object) (Line: 109)
Drupal\Core\EventSubscriber\HttpExceptionSubscriberBase->onException(Object, 'kernel.exception', Object) (Line: 246)
Symfony\Component\EventDispatcher\EventDispatcher::Symfony\Component\EventDispatcher\{closure}(Object, 'kernel.exception', Object) (Line: 206)
Symfony\Component\EventDispatcher\EventDispatcher->callListeners(Array, 'kernel.exception', Object) (Line: 56)
Symfony\Component\EventDispatcher\EventDispatcher->dispatch(Object, 'kernel.exception') (Line: 241)
Symfony\Component\HttpKernel\HttpKernel->handleThrowable(Object, Object, 1) (Line: 91)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 53)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 709)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Will say occasionally there are issues that target older branches. But know almost all have to land in 11.x first.

Are there really issues permitted that target Drupal 4.6.x-dev?

It should be made more obvious in initial issue creation that even if someone finds an issue in the latest stable release, it actually needs to be replicated in the latest unreleased major version up. You didn't even consider it a potential backport issue initially and just switched it to 11 from the get-go, which is not what I was reporting. But now at least this issue can be seen across the board.

@joshuasosa when i installed drupal 11.x on DDEV v1.23.2 and PHP 8.3.8 version then i found no warning in this version of drupal. But yes i found warning on Drupal 11.0.x with installation on DDEV v1.23.2 with PHP 8.3.8 version. But we can remove this warning by doing the following changes in the file core/includes/theme.inc

diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 1603c5c65d..80182a1f59 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1139,85 +1139,88 @@ function _template_preprocess_default_variables() {
* - page: A render element representing the page.
*/
function template_preprocess_html(&$variables) {
- $variables['page'] = $variables['html']['page'];
- unset($variables['html']['page']);
- $variables['page_top'] = NULL;
- if (isset($variables['html']['page_top'])) {
- $variables['page_top'] = $variables['html']['page_top'];
- unset($variables['html']['page_top']);
- }
- $variables['page_bottom'] = NULL;
- if (isset($variables['html']['page_bottom'])) {
- $variables['page_bottom'] = $variables['html']['page_bottom'];
- unset($variables['html']['page_bottom']);
- }
+ // Check if the 'html' array key exists.
+ if (isset($variables['html'])) {
+ $variables['page'] = $variables['html']['page'] ?? null;
+ unset($variables['html']['page']);
+ $variables['page_top'] = NULL;
+ if (isset($variables['html']['page_top'])) {
+ $variables['page_top'] = $variables['html']['page_top'];
+ unset($variables['html']['page_top']);
+ }
+ $variables['page_bottom'] = NULL;
+ if (isset($variables['html']['page_bottom'])) {
+ $variables['page_bottom'] = $variables['html']['page_bottom'];
+ unset($variables['html']['page_bottom']);
+ }

- $variables['html_attributes'] = new Attribute();
+ $variables['html_attributes'] = new Attribute();

- // element attributes.
- $language_interface = \Drupal::languageManager()->getCurrentLanguage();
- $variables['html_attributes']['lang'] = $language_interface->getId();
- $variables['html_attributes']['dir'] = $language_interface->getDirection();
+ // element attributes.
+ $language_interface = \Drupal::languageManager()->getCurrentLanguage();
+ $variables['html_attributes']['lang'] = $language_interface->getId();
+ $variables['html_attributes']['dir'] = $language_interface->getDirection();

- if (isset($variables['db_is_active']) && !$variables['db_is_active']) {
- $variables['db_offline'] = TRUE;
- }
+ if (isset($variables['db_is_active']) && !$variables['db_is_active']) {
+ $variables['db_offline'] = TRUE;
+ }

- // Add a variable for the root path. This can be used to create a class and
- // theme the page depending on the current path (e.g. node, admin, user) as
- // well as more specific data like path-frontpage.
- $is_front_page = \Drupal::service('path.matcher')->isFrontPage();
+ // Add a variable for the root path. This can be used to create a class and
+ // theme the page depending on the current path (e.g. node, admin, user) as
+ // well as more specific data like path-frontpage.
+ $is_front_page = \Drupal::service('path.matcher')->isFrontPage();

- if ($is_front_page) {
- $variables['root_path'] = FALSE;
- }
- else {
- $system_path = \Drupal::service('path.current')->getPath();
- $variables['root_path'] = explode('/', $system_path)[1];
- }
+ if ($is_front_page) {
+ $variables['root_path'] = FALSE;
+ }
+ else {
+ $system_path = \Drupal::service('path.current')->getPath();
+ $variables['root_path'] = explode('/', $system_path)[1] ?? null;
+ }

- $site_config = \Drupal::config('system.site');
- // Construct page title.
- if (isset($variables['page']['#title']) && is_array($variables['page']['#title'])) {
- // Do an early render if the title is a render array.
- $variables['page']['#title'] = (string) \Drupal::service('renderer')->render($variables['page']['#title']);
- }
- if (!empty($variables['page']['#title'])) {
- $head_title = [
- // Marking the title as safe since it has had the tags stripped.
- 'title' => Markup::create(trim(strip_tags($variables['page']['#title']))),
- 'name' => $site_config->get('name'),
- ];
- }
- // @todo Remove once views is not bypassing the view subscriber anymore.
- // @see https://www.drupal.org/node/2068471 →
- elseif ($is_front_page) {
- $head_title = [
- 'title' => t('Home'),
- 'name' => $site_config->get('name'),
- ];
- }
- else {
- $head_title = ['name' => $site_config->get('name')];
- if ($site_config->get('slogan')) {
- $head_title['slogan'] = strip_tags($site_config->get('slogan'));
+ $site_config = \Drupal::config('system.site');
+ // Construct page title.
+ if (isset($variables['page']['#title']) && is_array($variables['page']['#title'])) {
+ // Do an early render if the title is a render array.
+ $variables['page']['#title'] = (string) \Drupal::service('renderer')->render($variables['page']['#title']);
+ }
+ if (!empty($variables['page']['#title'])) {
+ $head_title = [
+ // Marking the title as safe since it has had the tags stripped.
+ 'title' => Markup::create(trim(strip_tags($variables['page']['#title']))),
+ 'name' => $site_config->get('name'),
+ ];
+ }
+ // @todo Remove once views is not bypassing the view subscriber anymore.
+ // @see https://www.drupal.org/node/2068471 →
+ elseif ($is_front_page) {
+ $head_title = [
+ 'title' => t('Home'),
+ 'name' => $site_config->get('name'),
+ ];
+ }
+ else {
+ $head_title = ['name' => $site_config->get('name')];
+ if ($site_config->get('slogan')) {
+ $head_title['slogan'] = strip_tags($site_config->get('slogan'));
+ }
}
- }

- $variables['head_title'] = $head_title;
+ $variables['head_title'] = $head_title;

- // Create placeholder strings for these keys.
- // @see \Drupal\Core\Render\HtmlResponseSubscriber
- $types = [
- 'styles' => 'css',
- 'scripts' => 'js',
- 'scripts_bottom' => 'js-bottom',
- 'head' => 'head',
- ];
- $variables['placeholder_token'] = Crypt::randomBytesBase64(55);
- foreach ($types as $type => $placeholder_name) {
- $placeholder = '<' . $placeholder_name . '-placeholder token="' . $variables['placeholder_token'] . '">';
- $variables['#attached']['html_response_attachment_placeholders'][$type] = $placeholder;
+ // Create placeholder strings for these keys.
+ // @see \Drupal\Core\Render\HtmlResponseSubscriber
+ $types = [
+ 'styles' => 'css',
+ 'scripts' => 'js',
+ 'scripts_bottom' => 'js-bottom',
+ 'head' => 'head',
+ ];
+ $variables['placeholder_token'] = Crypt::randomBytesBase64(55);
+ foreach ($types as $type => $placeholder_name) {
+ $placeholder = '<' . $placeholder_name . '-placeholder token="' . $variables['placeholder_token'] . '">';
+ $variables['#attached']['html_response_attachment_placeholders'][$type] = $placeholder;
+ }
}
}

Are there really issues permitted that target Drupal 4.6.x-dev?

This is off-topic, truly. Please let’s discuss it elsewhere and I am sure there already are issues.

@cilefen Then please do not change issue information when the report is not meant for 11.x and there is no information in the issue creation workflow to indicate that new issues must only be against 11.x.

Fixes are made on on 11.x (our main development branch) first, and are then back ported as needed according to our policies.

j_s → changed the visibility of the branch 3454769-undefined-array-key to hidden.

j_s → changed the visibility of the branch 10.4.x to hidden.

j_s → changed the visibility of the branch 11.x to hidden.

11.x MR added. Attached a patch for 10.3.