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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 | 
|---|---|
| 1235 |           } else { | 
| 1236 |  | 
| 1237 |                /** | 
| 1238 |                 * Fires when the 'deleted' status is removed from a site. | 
| 1239 |                 * | 
| 1240 |                 * @since 3.5.0 | 
| 1241 |                 * | 
| 1242 |                 * @param int $site_id Site ID. | 
| 1243 |                 */ | 
| 1244 |                do_action( 'make_undelete_blog', $site_id ); | 
| 1245 |           } | 
| 1246 |      } | 
| 1247 |  | 
| 1248 |      if ( $new_site->public !== $old_site->public ) { | 
| 1249 |  | 
| 1250 |           /** | 
| 1251 |            * Fires after the current blog's 'public' setting is updated. | 
| 1252 |            * | 
| 1253 |            * @since MU (3.0.0) |