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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 |
|---|---|
| 1099 | $message_headers = "$from\n" |
| 1100 | . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; |
| 1101 | |
| 1102 | if ( isset($reply_to) ) |
| 1103 | $message_headers .= $reply_to . "\n"; |
| 1104 | |
| 1105 | $emails = array( $author->user_email ); |
| 1106 | |
| 1107 | $emails = apply_filters( 'comment_notification_recipients', $emails, $comment_id ); |
| 1108 | $notify_message = apply_filters( 'comment_notification_text', $notify_message, $comment_id ); |
| 1109 | $subject = apply_filters( 'comment_notification_subject', $subject, $comment_id ); |
| 1110 | $message_headers = apply_filters( 'comment_notification_headers', $message_headers, $comment_id ); |
| 1111 | |
| 1112 | foreach ( $emails as $email ) { |
| 1113 | @wp_mail( $email, $subject, $notify_message, $message_headers ); |
| 1114 | } |
| 1115 | |
| 1116 | return true; |
| 1117 | } |