Purpose

Processes comment submissions and prevents duplicate/invalid posts.

Flow

• Requires a POST request; otherwise returns 405.
• Loads WordPress and disables cache headers.
• Calls wp_handle_comment_submission() to validate and insert.
• Fires cookie-setting hook and redirects to the comment location.

Key functions called

• wp_handle_comment_submission()
• wp_get_current_user()
• wp_safe_redirect()

Hooks fired

• Actions:
  • set_comment_cookies
• Filters:
  • comment_post_redirect