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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 |
---|---|
1654 | * |
1655 | * By default, only post authors are notified of comments. This filter allows |
1656 | * others to be added. |
1657 | * |
1658 | * @since 3.7.0 |
1659 | * |
1660 | * @param string[] $emails An array of email addresses to receive a comment notification. |
1661 | * @param string $comment_id The comment ID as a numeric string. |
1662 | */ |
1663 | $emails = apply_filters( 'comment_notification_recipients', $emails, $comment->comment_ID ); |
1664 | $emails = array_filter( $emails ); |
1665 |
|
1666 | // If there are no addresses to send the comment to, bail. |
1667 | if ( ! count( $emails ) ) { |
1668 | return false; |
1669 | } |
1670 |
|
1671 | // Facilitate unsetting below without knowing the keys. |
1672 | $emails = array_flip( $emails ); |