How to Solve the Cannot Acquire Reference to $GLOBALS Error

This Q&A thread addresses the warning about trying to access $GLOBALS in the Worker plugin’s Context.php file. It walks through inspecting the code, testing plugin conflicts, updating PHP settings, and using site_url() instead of raw globals.

Cannot acquire reference to $GLOBALS in /data/sites/web/sani-heatingbe/subsites/dev.sani-heating.be/wp-content/plugins/worker/src/MWP/WordPress/Context.php on line 31

Troubleshooting “Cannot acquire reference to $GLOBALS”

That warning usually pops up when a plugin tries to use the global scope incorrectly. Here’s a quick rundown of steps you can run through:

1. Inspect the Code

  • Open Context.php around line 31.
  • See how $GLOBALS is being used. Is it reading, assigning, or something else?

2. Update the Plugin

  • Make sure the Worker plugin is on its latest release. Bugs often get squashed in updates.

3. Rule Out Conflicts

  • Turn off other plugins. If the message vanishes, reactivate each plugin one by one until you find the clash.

4. Check Your Theme

  • Switch briefly to a core WordPress theme (for example, Twenty Twenty-Three). If the error stops, the issue might lie in your active theme.

5. PHP Version

  • Make sure you’re on a PHP release that WordPress supports.

6. Enable Debug Logging

  • In wp-config.php, add or update:
define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
  • Check wp-content/debug.log for extra clues.

Example Fix

If line 31 looks like this:

$site_url = $GLOBALS['siteurl'];

That could blow up if $GLOBALS['siteurl'] isn’t set. Instead of tapping into $GLOBALS, you can grab the same value via a WordPress function:

$site_url = site_url();

Additional Resources

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