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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 |
|---|---|
| 1362 | * |
| 1363 | * By default, only post authors are notified of comments. This filter allows |
| 1364 | * others to be added. |
| 1365 | * |
| 1366 | * @since 3.7.0 |
| 1367 | * |
| 1368 | * @param array $emails An array of email addresses to receive a comment notification. |
| 1369 | * @param int $comment_id The comment ID. |
| 1370 | */ |
| 1371 | $emails = apply_filters( 'comment_notification_recipients', $emails, $comment_id ); |
| 1372 | $emails = array_filter( $emails ); |
| 1373 | |
| 1374 | // If there are no addresses to send the comment to, bail. |
| 1375 | if ( ! count( $emails ) ) { |
| 1376 | return false; |
| 1377 | } |
| 1378 | |
| 1379 | // Facilitate unsetting below without knowing the keys. |
| 1380 | $emails = array_flip( $emails ); |