The function is_user_logged_in() is not available at shutdown (plugin context, not theme).

I want my plugin to run only (1) on front-end pages and (2) when the user is not logged in.

This works, but since it also runs on Divi builder front-end pages, I need to add !is_user_logged_in:

if (!is_admin()) {
    add_action('shutdown', function () {
        // Do some ob_start() and PHP_Tidy() stuff...
    }, 0);

Unfortunately changing my conditional to if (!is_admin() && !is_user_logged_in()) fails with:

Uncaught Error: Call to undefined function is_user_logged_in() in...

Edit User Patrice says below that shutdown is too early to check for is_user_logged_in(). How could that could be? Shutdown is the last hook fired: Before PHP execution is about to end


  • 1
    Please note that is_user_logged_in is a pluggable function and you could get a fatal error if you call it too early. To solve this problem, you can wrap the login check within a function hooked to the init action. Please check this comment in the Codex : developer.wordpress.org/reference/functions/is_user_logged_in/… Commented Apr 18, 2023 at 19:27
  • Thanks Patrice, but I need my action to run at shutdown. Is that too early?
    – Jeff
    Commented Apr 18, 2023 at 20:59

1 Answer 1


Edit 1 - Does not work

// Catch is_user_logged_in() value before shutdown

function is_user_logged_in_init() {
    $is_user_logged_in_init = is_user_logged_in() ?? false;
add_action('init', 'is_user_logged_in_init');

Leaving this here for my reference. Ref

Edit 2 - Works

I found two ways to solve this:

  1. Option 1 - Not recommended Ref

include_once ABSPATH.'wp-includes/pluggable.php';

  1. Option 2 - Rewrite the script, i.e. Add shutdown action inside init action
function beautify_conditionals() {
    if (!is_admin() && !is_user_logged_in()) {
        add_action('shutdown', 'beautify_actions', 0);

add_action('init', 'beautify_conditionals');

function beautify_actions() {
    $html = ob_get_clean();

    $tidy = new tidy;
    $tidy->parseString($html, [
        'drop-empty-elements' => false,
        'drop-empty-paras' => false,
        'escape-scripts' => false,
        'fix-backslash' => false,
        'fix-style-tags' => false,
        'fix-uri' => false,
        'indent' => true,
        'indent-spaces' => 4,
        'join-styles' => false,
        'lower-literals' => false,
        'tab-size' => 4,
        'tidy-mark' => false,
        'wrap' => 0,
    ], 'utf8');

    $tidy = preg_replace('/<!DOCTYPE html>/', '<!doctype html>', $tidy);

    echo $tidy;

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