PHP 8.1: explode(): Passing null to parameter #2 ($string) of type string is deprecated in pwa_str_to_list

Hi everyone,

Thank you very much for raising this issue.

We encountered the same problem running with:

• Drupal core: 9.5.2
• PWA: 8.x-1.5
• PHP: 8.1.14

 
and without any value for URLs to cache on install on the admin settings page at /admin/config/pwa/settings.

Based on a quick search around we found several other modules having the same issue, in particular, see:
#3321432-2: Deprecated function: explode(): Passing null to parameter #2 ($string) of type string is deprecated on ProxySubscriber.php →

Therefore attaching a patch with a preferred syntax to fix the problem:
File attached as: 3335176-6-php81-fix-warning-explode-null-deprecated.patch →

  $list = $string ? explode("\n", $string) : [];

The changes from the MR !30 above should work as well, so feel free to pick your preferred solution.

Any feedback, comments, suggestions or reviews would be greatly appreciated.
Thanks in advance.

Applying #6 tested and works well.

Follow-up: 📌 Remove patch file from the repo Fixed

Anybody → closed merge request !30