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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 | 
|---|---|
| 310 |                 * Filters a specific, non-default site-updated message in the Network admin. | 
| 311 |                 * | 
| 312 |                 * The dynamic portion of the hook name, `$_GET['updated']`, refers to the | 
| 313 |                 * non-default site update action. | 
| 314 |                 * | 
| 315 |                 * @since 3.1.0 | 
| 316 |                 * | 
| 317 |                 * @param string $msg The update message. Default 'Settings saved'. | 
| 318 |                 */ | 
| 319 |                $msg = apply_filters( 'network_sites_updated_message_' . $_GET['updated'], __( 'Settings saved.' ) ); | 
| 320 |           break; | 
| 321 |      } | 
| 322 |  | 
| 323 |      if ( ! empty( $msg ) ) | 
| 324 |           $msg = '<div id="message" class="updated notice is-dismissible"><p>' . $msg . '</p></div>'; | 
| 325 | } | 
| 326 |  | 
| 327 | $wp_list_table->prepare_items(); | 
| 328 |  |