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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 |
|---|---|
| 1572 | * path depending on the network settings. |
| 1573 | * |
| 1574 | * @since 3.5.0 |
| 1575 | * |
| 1576 | * @param int|null $result The site ID if the site name exists, null otherwise. |
| 1577 | * @param string $domain Domain to be checked. |
| 1578 | * @param string $path Path to be checked. |
| 1579 | * @param int $network_id Network ID. Relevant only on multi-network installations. |
| 1580 | */ |
| 1581 | return apply_filters( 'domain_exists', $result, $domain, $path, $network_id ); |
| 1582 | } |
| 1583 | |
| 1584 | /** |
| 1585 | * Notifies the site administrator that their site activation was successful. |
| 1586 | * |
| 1587 | * Filter {@see 'wpmu_welcome_notification'} to disable or bypass. |
| 1588 | * |
| 1589 | * Filter {@see 'update_welcome_email'} and {@see 'update_welcome_subject'} to |
| 1590 | * modify the content and subject line of the notification email. |