Fix: Apply WordPress filters to post content, excerpt, and title in get_fb_description()

[sol-loup]

Description

Fixes #1712

Previously, get_fb_description() was directly accessing post properties ($post->post_content, $post->post_excerpt, $post->post_title) which bypassed WordPress and third-party plugin filters.

This caused issues when plugins used filters like the_content, the_excerpt, or get_the_title to modify product descriptions, as these modifications were not reflected in the Facebook catalog.

Changes Made

• Replace $post->post_content with apply_filters('the_content', $post->post_content)
• Replace $post->post_excerpt with get_the_excerpt($post)
• Replace $post->post_title with get_the_title($post)

This ensures that all WordPress filters are properly applied and third-party plugins that modify post content, excerpts, or titles will now work correctly with Facebook product descriptions.

Type of change

• Fix (non-breaking change which fixes an issue)

Checklist

• I have commented my code, particularly in hard-to-understand areas, if any.
• I have confirmed that my changes do not introduce any new PHPCS warnings or errors.
• I have checked plugin debug logs that my changes do not introduce any new PHP warnings or FATAL errors.
• I followed general Pull Request best practices.
• I have added tests (if necessary) and all the new and existing unit tests pass locally with my changes.
• I have completed dogfooding and QA testing, or I have conducted thorough due diligence to ensure that it does not break existing functionality.
• I have updated or requested update to plugin documentations (if necessary).

Changelog entry

Fix - Apply WordPress filters to post content, excerpt, and title when generating Facebook product descriptions

Test Plan

Manual Testing Steps:

1. Install a plugin that modifies product titles using WordPress filters (or add this code to functions.php):

   add_filter('the_title', function($title, $post_id) {
       $post = get_post($post_id);
       if ($post && $post->post_type === 'product') {
           return 'Modified: ' . $title;
       }
       return $title;
   }, 10, 2);

2. Create or edit a WooCommerce product

3. Sync the product to Facebook catalog

4. Verify the modified title (with "Modified: " prefix) appears in Facebook Commerce Manager

5. Remove the test filter and verify normal titles work correctly

Expected Behavior:

Before: Product titles/descriptions in Facebook catalog ignored WordPress filters
After: Product titles/descriptions in Facebook catalog properly apply all WordPress filters, allowing third-party plugins to modify the content sent to Facebook

Compatibility:

• Maintains backward compatibility - if no filters are present, behavior is identical to before
• Does not break existing functionality
• Allows plugins like multilingual plugins, SEO plugins, etc. to properly modify Facebook product data

Related Issues

Closes #1712 (reported November 2020 - 5 years old!)

[github-actions]

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