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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 | 
|---|---|
| 2359 |  * @return bool True on success, false on failure. | 
| 2360 |  */ | 
| 2361 | function wp_new_comment_notify_moderator( $comment_id ) { | 
| 2362 |      $comment = get_comment( $comment_id ); | 
| 2363 |  | 
| 2364 |      // Only send notifications for pending comments. | 
| 2365 |      $maybe_notify = ( '0' == $comment->comment_approved ); | 
| 2366 |  | 
| 2367 |      /** This filter is documented in wp-includes/pluggable.php */ | 
| 2368 |      $maybe_notify = apply_filters( 'notify_moderator', $maybe_notify, $comment_id ); | 
| 2369 |  | 
| 2370 |      if ( ! $maybe_notify ) { | 
| 2371 |           return false; | 
| 2372 |      } | 
| 2373 |  | 
| 2374 |      return wp_notify_moderator( $comment_id ); | 
| 2375 | } | 
| 2376 |  | 
| 2377 | /** |