05.10.2026 | Michael Ebert

Enable the admin theme for your custom route

my_module.routing.yml
my_module.edit:
  options:
    # Enable the admin theme for this route.
    _admin_route: TRUE

Issue:

You are registering a new route and would like it to be displayed using the administrative theme.

Solution:

To enable the admin theme on your custom route, you can add it as option in your routing.yml file. But keep in mind that this will only work for users that have permission to use the admin theme!

See the Drupal documentation for further information.

drupal
routing
admin theme
backend

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Weitere DevBits

30.07.2026 | Lothar Ferreira Neumann

Merge multidimensional arrays in Drupal

nested_array_merge_deep.php
use Drupal\Component\Utility\NestedArray;

// Parent array with default settings.
$parent_array = [
    'config' => [
        'theme' => 'dark',
        'layout' => [
            'width' => 800,
            'height' => 600,
        ],
    ],
];

// Child array adds more nested data but doesn't override existing values.
$child_array = [
    'config' => [
        'layout' => [
            'depth' => 300, // New nested key
        ],
        'features' => [
            'animations' => true, // New section
        ],
    ],
];

// Merge both arrays.
$merged_array = NestedArray::mergeDeep($parent_array, $child_array);
nested_array_result.php
[
    'config' => [
        // Unchanged (not overridden)
        'theme' => 'dark', 
        'layout' => [
            // Keeps parent value
            'width' => 800, 
            // Keeps parent value  
            'height' => 600,
            // New nested key added
            'depth' => 300,   
        ],
        'features' => [
            // New section added
            'animations' => true, 
        ],
    ],
]
php
array manipulation
arrays
drupal
05.03.2026 | Michael Ebert

How to output the processed value of a WYSIWYG text field

EntityFieldValue.php
$raw_value = $entity->my_text_field->value;
echo $raw_value;  // Outputs the raw data
EntityFieldProcessed.php
$processed_value = $entity->my_text_field->processed;
echo $processed_value;  // Outputs the processed and safe-to-display data
drupal
fields
WYSIWYG