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How do I convert code implementing hook_init()?

Looking on Drupal.org API, I noticed that hook_init() is not documented for Drupal 8. Looking at the change records, I found Bootstrap hooks no longer exist, which points to Get rid of all ‘bootstrap’ hooks, where the bootstrap hooks are said to be hook_boot() and hook_exit(); nothing is said about hook_init().

I searched for hook_init in Drupal 8 source, and I found the following code. The first one is a reference to hook_init() made in a comment; the other two seem a hook_init() implementation, but they both get a parameter I am not expecting.

function overlay_enable() {   if (strpos(current_path(), 'admin/modules') === 0) {     // Flag for a redirect to <front>#overlay=admin/modules on hook_init().     $_SESSION['overlay_enable_redirect'] = 1;   } } 
/**  * Implements hook_init().  */ function phptemplate_init($template) {   $file = dirname($template->filename) . '/' . $template->name . '.theme';   if (file_exists($file)) {     include_once DRUPAL_ROOT . '/' . $file;   } } 
/**  * Implements hook_init().  */ function twig_init($template) {   $file = dirname($template->filename) . '/' . $template->name . '.theme';   if (file_exists($file)) {     include_once DRUPAL_ROOT . '/' . $file;   } }

I also looked for any function invoking hook_init() but I didn’t find any.

How do I convert Drupal 7 code implementing hook_init() to code running on Drupal 8/9?

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How do I convert code implementing hook_init()?

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