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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 |
|---|---|
| 1986 | $result = add_user_to_blog( $blog_id, $details[ 'user_id' ], $details[ 'role' ] ); |
| 1987 | /** |
| 1988 | * Fires immediately after an existing user is added to a site. |
| 1989 | * |
| 1990 | * @since MU |
| 1991 | * |
| 1992 | * @param int $user_id User ID. |
| 1993 | * @param mixed $result True on success or a WP_Error object if the user doesn't exist. |
| 1994 | */ |
| 1995 | do_action( 'added_existing_user', $details['user_id'], $result ); |
| 1996 | return $result; |
| 1997 | } |
| 1998 | } |
| 1999 | |
| 2000 | /** |
| 2001 | * Add a newly created user to the appropriate blog |
| 2002 | * |
| 2003 | * To add a user in general, use add_user_to_blog(). This function |
| 2004 | * is specifically hooked into the wpmu_activate_user action. |