是否从SAVE_POST操作返回代码？

我想知道我应该从WordPress返回什么值save_post 动作功能。

此示例来自save_post documentation 显式和隐式返回均不带值：

function my_project_updated_send_email( $post_id ) {

    // If this is just a revision, don\'t send the email.
    if ( wp_is_post_revision( $post_id ) )
        return;

    $post_title = get_the_title( $post_id );
    $post_url = get_permalink( $post_id );
    $subject = \'A post has been updated\';

    $message = "A post has been updated on your website:\\n\\n";
    $message .= $post_title . ": " . $post_url;

    // Send email to admin.
    wp_mail( \'[email protected]\', $subject, $message );
}
add_action( \'save_post\', \'my_project_updated_send_email\' );

但是，此示例来自add_meta_box 文档非常明确地返回了传入的$post\\u id（如果提前返回），但如果函数执行到最后，则不返回任何内容。

/**
 * When the post is saved, saves our custom data.
 *
 * @param int $post_id The ID of the post being saved.
 */
function myplugin_save_postdata( $post_id ) {

  /*
   * We need to verify this came from the our screen and with proper authorization,
   * because save_post can be triggered at other times.
   */

  // Check if our nonce is set.
  if ( ! isset( $_POST[\'myplugin_inner_custom_box_nonce\'] ) )
    return $post_id;

  $nonce = $_POST[\'myplugin_inner_custom_box_nonce\'];

  // Verify that the nonce is valid.
  if ( ! wp_verify_nonce( $nonce, \'myplugin_inner_custom_box\' ) )
      return $post_id;

  // If this is an autosave, our form has not been submitted, so we don\'t want to do anything.
  if ( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE ) 
      return $post_id;

  // Check the user\'s permissions.
  if ( \'page\' == $_POST[\'post_type\'] ) {

    if ( ! current_user_can( \'edit_page\', $post_id ) )
        return $post_id;

  } else {

    if ( ! current_user_can( \'edit_post\', $post_id ) )
        return $post_id;
  }

  /* OK, its safe for us to save the data now. */

  // Sanitize user input.
  $mydata = sanitize_text_field( $_POST[\'myplugin_new_field\'] );

  // Update the meta field in the database.
  update_post_meta( $post_id, \'_my_meta_value_key\', $mydata );
}
add_action( \'save_post\', \'myplugin_save_postdata\' );

那页上没有显示它为什么会回来$post_id 如果它早点回来。

似乎没有任何关于save_post 抄本页的一种或另一种方式。我在网上也看到了相互矛盾的建议。

在中创建动作函数的示例Plugin API documentation 看起来它也是save_post 操作，并返回$post_id 虽然没有说明原因，但还是谈到了成功：

function email_friends($post_ID)  {
    $friends = \'[email protected],[email protected]\';
    mail($friends, "sally\'s blog updated", 
      \'I just put something on my blog: http://blog.example.com\');
    return $post_ID;
}

有谁能告诉我，如果有什么事的话，我应该从save_post 行动，以及为什么，最好有某种官方参考？

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