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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 |
|---|---|
| 1741 | |
| 1742 | /** |
| 1743 | * Filters the comment notification email headers. |
| 1744 | * |
| 1745 | * @since 1.5.2 |
| 1746 | * |
| 1747 | * @param string $message_headers Headers for the comment notification email. |
| 1748 | * @param int $comment_id Comment ID. |
| 1749 | */ |
| 1750 | $message_headers = apply_filters( 'comment_notification_headers', $message_headers, $comment->comment_ID ); |
| 1751 | |
| 1752 | foreach ( $emails as $email ) { |
| 1753 | wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers ); |
| 1754 | } |
| 1755 | |
| 1756 | if ( $switched_locale ) { |
| 1757 | restore_previous_locale(); |
| 1758 | } |
| 1759 | |