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009-Các hàm tạo giao diện của woocommerce và hook (Hàm: function…

- - - - https://docs.woocommerce.com/wc-apidocs/package-WooCommerce.Functions.html
  - - - https://docs.woocommerce.com/wc-apidocs/package-WooCommerce.Functions.html
    - - https://docs.woocommerce.com/document/conditional-tags/
- - - - được sử dụng tron template của woocommerce
    - - Tất cả các hook được định nghĩa trong file này
      - có trong woocommerce/includes
    - - https://docs.woocommerce.com/wc-apidocs/hook-docs.html
      - https://docs.woocommerce.com/document/introduction-to-hooks-actions-and-filters/
  - - - thay vì viết:<h1 style="color:white"
        
        thì ta viết: <h1 class="mausac cangiua fontchu"..
        
        muốn thay đổi các gì(màu sắc, căn giữa, font chử thì ta chỉ cần thay đổi class đó)
  - - - là thực hiện một hành động(một hàm) nào đó với 1 tag
        
        Coi bài viết sau
        
        https://thachpham.com/wordpress/wordpress-development/cach-su-dung-action-hook-trong-wordpress.html
      - Chi tiết
        
        Định nghĩa function
        
        2.Tạo hook như sau: add_action( $hook, $function_to_add, $priority, $accepted_args );
        
        $hook(tên của hook)
        
        Bắt buộc
        
        hook cùa woo
        
        https://docs.woocommerce.com/document/introduction-to-hooks-actions-and-filters/
        
        https://codex.wordpress.org/Plugin_API/Action_Reference
        
        ví dụ:init
        
        khởi tạo hàm
        
        $function_to_add
        
        Hay còn gọi là Callback_function
        
        bắt buộc
        
        Mực ưu tiên
        
        Tham số truyền vào
        
        Chạy hook
        
        do_action($hook)
    - - Vai trò: Dùng để lọc dữ liệu