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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 |
|---|---|
| 1834 | |
| 1835 | /** |
| 1836 | * Filters the comment notification email subject. |
| 1837 | * |
| 1838 | * @since 1.5.2 |
| 1839 | * |
| 1840 | * @param string $subject The comment notification email subject. |
| 1841 | * @param string $comment_id Comment ID as a numeric string. |
| 1842 | */ |
| 1843 | $subject = apply_filters( 'comment_notification_subject', $subject, $comment->comment_ID ); |
| 1844 | |
| 1845 | /** |
| 1846 | * Filters the comment notification email headers. |
| 1847 | * |
| 1848 | * @since 1.5.2 |
| 1849 | * |
| 1850 | * @param string $message_headers Headers for the comment notification email. |
| 1851 | * @param string $comment_id Comment ID as a numeric string. |
| 1852 | */ |