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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 |
|---|---|
| 2079 | $result = add_user_to_blog( $blog_id, $details[ 'user_id' ], $details[ 'role' ] ); |
| 2080 | /** |
| 2081 | * Fires immediately after an existing user is added to a site. |
| 2082 | * |
| 2083 | * @since MU |
| 2084 | * |
| 2085 | * @param int $user_id User ID. |
| 2086 | * @param mixed $result True on success or a WP_Error object if the user doesn't exist. |
| 2087 | */ |
| 2088 | do_action( 'added_existing_user', $details['user_id'], $result ); |
| 2089 | return $result; |
| 2090 | } |
| 2091 | } |
| 2092 | |
| 2093 | /** |
| 2094 | * Adds a newly created user to the appropriate blog |
| 2095 | * |
| 2096 | * To add a user in general, use add_user_to_blog(). This function |
| 2097 | * is specifically hooked into the {@see 'wpmu_activate_user'} action. |