Upgrade to PHP 8.1 & Node 16

[tormi]

Let's upgrade the defaults to PHP 8.1 & Node 16.

[tormi]

PHP versions 8.1.0 to 8.1.5 have an OPcache bug that can cause fatal errors with class autoloading. It can be avoided by using PHP 8.1.6 or later.

[tormi]

Instana currently does not support PHP 8.1.

[tormi]

Hannes Kirsman
Lessons learned from going to PHP 8.0, 8.1

• Going for PHP 8.0 went much smoother
• 8.1 is suggested by Drupal core but it'll flood logs with deprecated code warnings
• In one of our sites we have drupal.log on disk. Usually it's 4-5 GB per month. Now it was 34GB and it was not even end of month. There were over 1 million logs per day.
• Some modules that need updating: Redirect, Token, Webform, Typed Data API enhancements, CSV Serialization, Rabbit Hole etc. Probably also your custom modules. For some modules you probably need patching. We even added one core patch https://www.drupal.org/project/drupal/issues/3264979
• At least one warning is coming from vendor package PHP8 deprecation warnings hechoendrupal/drupal-console-core#388
• Our Code Quality tool won't catch many errors because it does not know what the actual values are that are passed around
• Some warnings seems to come from core but it's actually t() methods where there are arguments that are sometimes empty. Eg return t('Hello @world', array('@world' => $var_that_is_null_for_some_reason)); These null values are sent for PHP methods like htmlspecialchars() and voila - you have deprecated code issue.

[tormi]

Looks like we need to wait with the move to v8.1.