SerializationHooks.php

<?php

namespace Drupal\serialization\Hook;

use Drupal\Core\Url;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Hook\Attribute\Hook;

/**
 * Hook implementations for serialization.
 */
class SerializationHooks {
    
    /**
     * Implements hook_help().
     */
    public function help($route_name, RouteMatchInterface $route_match) {
        switch ($route_name) {
            case 'help.page.serialization':
                $output = '';
                $output .= '<h2>' . t('About') . '</h2>';
                $output .= '<p>' . t('The Serialization module provides a service for serializing and deserializing data to and from formats such as JSON and XML.') . '</p>';
                $output .= '<p>' . t('Serialization is the process of converting data structures like arrays and objects into a string. This allows the data to be represented in a way that is easy to exchange and store (for example, for transmission over the Internet or for storage in a local file system). These representations can then be deserialized to get back to the original data structures.') . '</p>';
                $output .= '<p>' . t('The serializer splits this process into two parts. Normalization converts an object to a normalized array structure. Encoding takes that array and converts it to a string.') . '</p>';
                $output .= '<p>' . t('This module does not have a user interface. It is used by other modules which need to serialize data, such as <a href=":rest">REST</a>.', [
                    ':rest' => \Drupal::moduleHandler()->moduleExists('rest') ? Url::fromRoute('help.page', [
                        'name' => 'rest',
                    ])->toString() : '#',
                ]) . '</p>';
                $output .= '<p>' . t('For more information, see the <a href=":doc_url">online documentation for the Serialization module</a>.', [
                    ':doc_url' => 'https://www.drupal.org/documentation/modules/serialization',
                ]) . '</p>';
                return $output;
        }
    }

}