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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 |
|---|---|
| 1399 | * |
| 1400 | * By default, only post authors are notified of comments. This filter allows |
| 1401 | * others to be added. |
| 1402 | * |
| 1403 | * @since 3.7.0 |
| 1404 | * |
| 1405 | * @param array $emails An array of email addresses to receive a comment notification. |
| 1406 | * @param int $comment_id The comment ID. |
| 1407 | */ |
| 1408 | $emails = apply_filters( 'comment_notification_recipients', $emails, $comment->comment_ID ); |
| 1409 | $emails = array_filter( $emails ); |
| 1410 | |
| 1411 | // If there are no addresses to send the comment to, bail. |
| 1412 | if ( ! count( $emails ) ) { |
| 1413 | return false; |
| 1414 | } |
| 1415 | |
| 1416 | // Facilitate unsetting below without knowing the keys. |
| 1417 | $emails = array_flip( $emails ); |