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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 |
|---|---|
| 1754 | |
| 1755 | /** |
| 1756 | * Filters the comment notification email headers. |
| 1757 | * |
| 1758 | * @since 1.5.2 |
| 1759 | * |
| 1760 | * @param string $message_headers Headers for the comment notification email. |
| 1761 | * @param string $comment_id Comment ID as a numeric string. |
| 1762 | */ |
| 1763 | $message_headers = apply_filters( 'comment_notification_headers', $message_headers, $comment->comment_ID ); |
| 1764 | |
| 1765 | foreach ( $emails as $email ) { |
| 1766 | $user = get_user_by( 'email', $email ); |
| 1767 | |
| 1768 | if ( $user ) { |
| 1769 | $switched_locale = switch_to_user_locale( $user->ID ); |
| 1770 | } else { |
| 1771 | $switched_locale = switch_to_locale( get_locale() ); |
| 1772 | } |