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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 |
|---|---|
| 1580 | $current_site->site_name = 'WordPress'; |
| 1581 | |
| 1582 | /** |
| 1583 | * Filter the subject of the welcome email after user activation. |
| 1584 | * |
| 1585 | * @since MU |
| 1586 | * |
| 1587 | * @param string $subject Subject of the email. |
| 1588 | */ |
| 1589 | $subject = apply_filters( 'update_welcome_user_subject', sprintf( __( 'New %1$s User: %2$s' ), $current_site->site_name, $user->user_login) ); |
| 1590 | wp_mail($user->user_email, $subject, $message, $message_headers); |
| 1591 | return true; |
| 1592 | } |
| 1593 | |
| 1594 | /** |
| 1595 | * Get the current site info. |
| 1596 | * |
| 1597 | * Returns an object containing the 'id', 'domain', 'path', and 'site_name' |
| 1598 | * properties of the site being viewed. |