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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 |
|---|---|
| 2124 | /** |
| 2125 | * Fires immediately after an existing user is added to a site. |
| 2126 | * |
| 2127 | * @since MU (3.0.0) |
| 2128 | * |
| 2129 | * @param int $user_id User ID. |
| 2130 | * @param mixed $result True on success or a WP_Error object if the user doesn't exist |
| 2131 | * or could not be added. |
| 2132 | */ |
| 2133 | do_action( 'added_existing_user', $details['user_id'], $result ); |
| 2134 | |
| 2135 | return $result; |
| 2136 | } |
| 2137 | } |
| 2138 | |
| 2139 | /** |
| 2140 | * Adds a newly created user to the appropriate blog |
| 2141 | * |
| 2142 | * To add a user in general, use add_user_to_blog(). This function |