What is the WordPress `WP_Hook` class architecture and how did it replace the previous array-based hook implementation?

WordPress Expert Hard

WordPress Expert — Hard

What is the WordPress `WP_Hook` class architecture and how did it replace the previous array-based hook implementation?

Key points

  • WP_Hook encapsulates priority-sorted callbacks
  • Handles recursion detection during filter execution
  • Maintains separate current_priority tracking
  • Solves issues with removing hooks within callbacks

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