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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 |
|---|---|
| 1820 | |
| 1821 | /** |
| 1822 | * Filters the comment notification email subject. |
| 1823 | * |
| 1824 | * @since 1.5.2 |
| 1825 | * |
| 1826 | * @param string $subject The comment notification email subject. |
| 1827 | * @param string $comment_id Comment ID as a numeric string. |
| 1828 | */ |
| 1829 | $subject = apply_filters( 'comment_notification_subject', $subject, $comment->comment_ID ); |
| 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 | */ |