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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 |
|---|---|
| 205 | /** |
| 206 | * Fires immediately after a user is added to a site. |
| 207 | * |
| 208 | * @since MU (3.0.0) |
| 209 | * |
| 210 | * @param int $user_id User ID. |
| 211 | * @param string $role User role. |
| 212 | * @param int $blog_id Blog ID. |
| 213 | */ |
| 214 | do_action( 'add_user_to_blog', $user_id, $role, $blog_id ); |
| 215 | |
| 216 | clean_user_cache( $user_id ); |
| 217 | wp_cache_delete( $blog_id . '_user_count', 'blog-details' ); |
| 218 | |
| 219 | restore_current_blog(); |
| 220 | |
| 221 | return true; |
| 222 | } |
| 223 | |