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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 |
|---|---|
| 1144 | } |
| 1145 | |
| 1146 | $message_headers = "$from\n" |
| 1147 | . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n"; |
| 1148 | |
| 1149 | if ( isset($reply_to) ) |
| 1150 | $message_headers .= $reply_to . "\n"; |
| 1151 | |
| 1152 | $notify_message = apply_filters( 'comment_notification_text', $notify_message, $comment_id ); |
| 1153 | $subject = apply_filters( 'comment_notification_subject', $subject, $comment_id ); |
| 1154 | $message_headers = apply_filters( 'comment_notification_headers', $message_headers, $comment_id ); |
| 1155 | |
| 1156 | foreach ( $emails as $email ) { |
| 1157 | @wp_mail( $email, $subject, $notify_message, $message_headers ); |
| 1158 | } |
| 1159 | |
| 1160 | return true; |
| 1161 | } |
| 1162 | endif; |