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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 |
|---|---|
| 1580 | * |
| 1581 | * By default, only post authors are notified of comments. This filter allows |
| 1582 | * others to be added. |
| 1583 | * |
| 1584 | * @since 3.7.0 |
| 1585 | * |
| 1586 | * @param string[] $emails An array of email addresses to receive a comment notification. |
| 1587 | * @param string $comment_id The comment ID as a numeric string. |
| 1588 | */ |
| 1589 | $emails = apply_filters( 'comment_notification_recipients', $emails, $comment->comment_ID ); |
| 1590 | $emails = array_filter( $emails ); |
| 1591 | |
| 1592 | // If there are no addresses to send the comment to, bail. |
| 1593 | if ( ! count( $emails ) ) { |
| 1594 | return false; |
| 1595 | } |
| 1596 | |
| 1597 | // Facilitate unsetting below without knowing the keys. |
| 1598 | $emails = array_flip( $emails ); |