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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 |
|---|---|
| 2219 | /** |
| 2220 | * Fires immediately after an existing user is added to a site. |
| 2221 | * |
| 2222 | * @since MU (3.0.0) |
| 2223 | * |
| 2224 | * @param int $user_id User ID. |
| 2225 | * @param true|WP_Error $result True on success or a WP_Error object if the user doesn't exist |
| 2226 | * or could not be added. |
| 2227 | */ |
| 2228 | do_action( 'added_existing_user', $details['user_id'], $result ); |
| 2229 | |
| 2230 | return $result; |
| 2231 | } |
| 2232 | } |
| 2233 | |
| 2234 | /** |
| 2235 | * Adds a newly created user to the appropriate blog |
| 2236 | * |
| 2237 | * To add a user in general, use add_user_to_blog(). This function |