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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 |
|---|---|
| 1850 | |
| 1851 | /** |
| 1852 | * Filters the comment notification email headers. |
| 1853 | * |
| 1854 | * @since 1.5.2 |
| 1855 | * |
| 1856 | * @param string $message_headers Headers for the comment notification email. |
| 1857 | * @param string $comment_id Comment ID as a numeric string. |
| 1858 | */ |
| 1859 | $message_headers = apply_filters( 'comment_notification_headers', $message_headers, $comment->comment_ID ); |
| 1860 | |
| 1861 | foreach ( $emails as $email ) { |
| 1862 | $user = get_user_by( 'email', $email ); |
| 1863 | |
| 1864 | if ( $user ) { |
| 1865 | $switched_locale = switch_to_user_locale( $user->ID ); |
| 1866 | } else { |
| 1867 | $switched_locale = switch_to_locale( get_locale() ); |
| 1868 | } |