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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 |
|---|---|
| 1830 | |
| 1831 | /** |
| 1832 | * Filters the comment notification email headers. |
| 1833 | * |
| 1834 | * @since 1.5.2 |
| 1835 | * |
| 1836 | * @param string $message_headers Headers for the comment notification email. |
| 1837 | * @param string $comment_id Comment ID as a numeric string. |
| 1838 | */ |
| 1839 | $message_headers = apply_filters( 'comment_notification_headers', $message_headers, $comment->comment_ID ); |
| 1840 | |
| 1841 | foreach ( $emails as $email ) { |
| 1842 | wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers ); |
| 1843 | } |
| 1844 | |
| 1845 | if ( $switched_locale ) { |
| 1846 | restore_previous_locale(); |
| 1847 | } |
| 1848 | |