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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 3417 |       * capabilities required to process requests. Some networks may wish to | 
| 3418 |       * delegate those capabilities to a single-site admin, or a dedicated person | 
| 3419 |       * responsible for managing privacy requests. | 
| 3420 |       * | 
| 3421 |       * @since 4.9.6 | 
| 3422 |       * | 
| 3423 |       * @param string          $admin_email The email address of the notification recipient. | 
| 3424 |       * @param WP_User_Request $request     The request that is initiating the notification. | 
| 3425 |       */ | 
| 3426 |      $admin_email = apply_filters( 'user_request_confirmed_email_to', get_site_option( 'admin_email' ), $request ); | 
| 3427 |  | 
| 3428 |      $email_data = array( | 
| 3429 |           'request'     => $request, | 
| 3430 |           'user_email'  => $request->email, | 
| 3431 |           'description' => $action_description, | 
| 3432 |           'manage_url'  => $manage_url, | 
| 3433 |           'sitename'    => wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ), | 
| 3434 |           'siteurl'     => home_url(), | 
| 3435 |           'admin_email' => $admin_email, |