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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 |
---|---|
1646 |
|
1647 | /** |
1648 | * Filters the comment notification email subject. |
1649 | * |
1650 | * @since 1.5.2 |
1651 | * |
1652 | * @param string $subject The comment notification email subject. |
1653 | * @param int $comment_id Comment ID. |
1654 | */ |
1655 | $subject = apply_filters( 'comment_notification_subject', $subject, $comment->comment_ID ); |
1656 |
|
1657 | /** |
1658 | * Filters the comment notification email headers. |
1659 | * |
1660 | * @since 1.5.2 |
1661 | * |
1662 | * @param string $message_headers Headers for the comment notification email. |
1663 | * @param int $comment_id Comment ID. |
1664 | */ |