I have a problem with drupal_register_shutdown_function(): my callback is not being called =| Here's example code:

 * Implements hook_node_update().
function example_node_update($node) {
  if ($node->type == 'test') {

    dpm(drupal_register_shutdown_function()); // This outputs callbacks array showing that '_example_shutdown' really gets registered.

function _example_shutdown() {
  dpm('Shutdown callback executed'); // This is not shown

I use php-fpm, and php.net register_shutdown_function discussion suggests to use fastcgi_finish_request() instead of register_shutdown_function() with php-fpm. Also, see this D8 issue: "Ensure register_shutdown_function() works with php-fpm". Is there any D7 workaround?

I think there could be two different approaches:

  1. Global: Fix drupal_register_shutdown_function() to check for php-fpm environment and use fastcgi_finish_request() in that case.

  2. Local: Use some hook to force _drupal_shutdown_function(). Maybe hook_exit() would be ok for some cases, but in my case it is too late (as my callback updates nodes, and by the time hook_exit() runs the response is already sent to the browser, so user would get an "old" node, I'm afraid).

Maybe there is something simpler that I'm missing?

1 Answer 1


Example shutdown is getting called ; you can't use dpm in a shutdown function though, because at that point the session already got written to the database and there's just no way to add a new message to it.

In PHP-FPM, the connection also could have already been closed, so print or var_dump is not really a good test to check if you're shutdown function is getting called in general ; it should work in D7 though if you're not using a module that's specifically closing the request, so you should be able to use print "Hello world"; and get it to show on screen (that's what the core "Shutdown functions tests" is doing in D7).

If you want something realiable to use in a shutdown function to check if it got invoked, try something like file_put_contents('/tmp/drupal-debug.txt', 'Shutdown function called');

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