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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 |
|---|---|
| 820 | $reply_to = "Reply-To: \"$comment->comment_author_email\" <$comment->comment_author_email>"; |
| 821 | } |
| 822 | |
| 823 | $message_headers = "$from\n" |
| 824 | . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; |
| 825 | |
| 826 | if ( isset($reply_to) ) |
| 827 | $message_headers .= $reply_to . "\n"; |
| 828 | |
| 829 | $notify_message = apply_filters('comment_notification_text', $notify_message, $comment_id); |
| 830 | $subject = apply_filters('comment_notification_subject', $subject, $comment_id); |
| 831 | $message_headers = apply_filters('comment_notification_headers', $message_headers, $comment_id); |
| 832 | |
| 833 | @wp_mail($user->user_email, $subject, $notify_message, $message_headers); |
| 834 | |
| 835 | return true; |
| 836 | } |
| 837 | endif; |
| 838 | |