fix: add check for taxonomy rewrite array in Links class

[michael-sumner]

Description of the Change

When accessing the /wp-admin/ there is a PHP error that can appear:

Warning: Trying to access array offset on value of type bool in /var/www/html/wp-content/plugins/headstartwp/includes/classes/Links.php on line 67

The error occurs because:

1. get_object_taxonomies( $post_type, 'object' ) returns taxonomy objects
2. Some taxonomies have $taxonomy->rewrite set to false instead of an array
3. The original code attempted to access $taxonomy->rewrite['slug'] without checking if rewrite is an array
4. PHP 7.4+ throws a warning when accessing array offset on boolean false

How to test the Change

1. Clear rewrite rules: delete_option( 'rewrite_rules' )
2. Access /wp-admin: Should regenerate rules without errors
3. Check error logs: No PHP warnings should appear
4. Verify rewrite rules: Check that valid taxonomies still have rules generated
5. Test with problematic taxonomy: Register taxonomy with rewrite => false and show_in_rest => true, verify no errors

• Create taxonomy with rewrite => false and show_in_rest => true
• Access /wp-admin after clearing rewrite rules
• Manually flush rewrite rules via Settings → Permalinks
• Activate/deactivate plugins that register taxonomies
• Test with multiple post types and taxonomies
• Verify no PHP warnings in error logs
• Verify rewrite rules are generated correctly

Changelog Entry

Fixed - error when taxonomy rewrite is not an array

Credits

Props @michael-sumner

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

---

Note

Add a check to skip taxonomies with non-array or missing rewrite['slug'] when building rewrite rules to avoid PHP warnings.

• Links (wp/headless-wp/includes/classes/Links.php):
  • In create_taxonomy_rewrites, skip taxonomies when rewrite is not an array or rewrite['slug'] is empty, preventing access of array offsets on non-arrays and limiting rule generation to valid taxonomies.

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[vercel]

@michael-sumner is attempting to deploy a commit to the tenup-internal Team on Vercel.

A member of the Team first needs to authorize it.

[nicholasio]

@michael-sumner could you add a changelog? run npx changeset and select the plugin and add a short changelog. This will bump the plugin version.