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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 |
|---|---|
| 1549 | |
| 1550 | /** |
| 1551 | * Filters the comment notification email subject. |
| 1552 | * |
| 1553 | * @since 1.5.2 |
| 1554 | * |
| 1555 | * @param string $subject The comment notification email subject. |
| 1556 | * @param int $comment_id Comment ID. |
| 1557 | */ |
| 1558 | $subject = apply_filters( 'comment_notification_subject', $subject, $comment->comment_ID ); |
| 1559 | |
| 1560 | /** |
| 1561 | * Filters the comment notification email headers. |
| 1562 | * |
| 1563 | * @since 1.5.2 |
| 1564 | * |
| 1565 | * @param string $message_headers Headers for the comment notification email. |
| 1566 | * @param int $comment_id Comment ID. |
| 1567 | */ |