Add missing $priority param to has_filter() and has_action()

[westonruter]

This cherry picks the has_filter()/has_action() changes from #10449 to isolate them from the changes to wp_oembed_add_discovery_links().

Trac ticket: https://core.trac.wordpress.org/ticket/64186

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[github-actions]

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[westonruter]

Review from Gemini:

The changes introduce a new $priority parameter to the has_filter method in WP_Hook class and the has_filter and has_action functions in plugin.php. This allows checking for the existence of a filter or action at a specific priority.

Review Summary:

• src/wp-includes/class-wp-hook.php:
  • The has_filter method now accepts an optional $priority parameter.
  • The docblock for has_filter has been updated with @since 6.9.0 Added the $priority parameter. and the @param and @return descriptions are correctly updated to reflect the new parameter and its behavior.
  • The internal logic correctly handles the new $priority parameter, including a check for is_int( $priority ) and changing the foreach loop variable to $callback_priority to avoid conflicts.
• src/wp-includes/plugin.php:
  • The has_filter and has_action functions now accept an optional $priority parameter and pass it to the WP_Hook class's has_filter method.
  • Docblocks for both functions are updated with @since 6.9.0 Added the $priority parameter. and the @param and @return descriptions are correctly updated.
• Test Files (tests/phpunit/tests/actions.php, tests/phpunit/tests/filters.php, tests/phpunit/tests/hooks/hasFilter.php):
  • New tests and modifications to existing tests have been added to cover the new $priority parameter functionality for has_action and has_filter.
  • @ticket 64186 has been added to the relevant test methods, which is appropriate for test files.

Overall Assessment:

The changes are well-implemented and adhere to WordPress coding standards. The docblocks are correctly updated, and the new functionality is covered by unit tests. The code remains compatible with PHP 7.2.

[github-actions]

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 61118
GitHub commit: faf3d46

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.