PHP 8.3 compatibility warning

The problem you are facing is because resource is a reserved word in PHP since version 7.0. In this case, the warning indicates that the word resource is being used within the namespace in several classes within the Drupal migrate_example_advanced module.

The most recommended is to rename the namespace within the affected files. Currently, the namespace is defined as:

Drupal namespace Drupal\migrate_example_advanced\Plugin\resource;

You can change it to something more secure, like resources or rest_resource, for example:

Drupal namespace Drupal\migrate_example_example_advanced\Plugin\rest\rest_resource;

Then, in each file where this namespace is used, make sure to update the corresponding references.

niharika.s → made their first commit to this issue’s fork.

Based on #2990879-18: 'resource' is a soft reserved keyword as of PHP version 7.0 and should not be used to name a class, interface or trait or as part of a namespace → , I do not think it is a problem to use resource as part of a namespace. I note that this issue does not raise an issue on Drupal CI phpcs.