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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.
This hook occurs 2 times in this file.
| Line | Code | 
|---|---|
| 377 |      if ( $details['deleted'] != $current_details['deleted'] ) { | 
| 378 |           if ( $details['deleted'] == 1 ) { | 
| 379 |                /** | 
| 380 |                 * Fires when the blog status is changed to 'deleted'. | 
| 381 |                 * | 
| 382 |                 * @since 3.5.0 | 
| 383 |                 * | 
| 384 |                 * @param int $blog_id Blog ID. | 
| 385 |                 */ | 
| 386 |                do_action( 'make_delete_blog', $blog_id ); | 
| 387 |           } else { | 
| 388 |                /** | 
| 389 |                 * Fires when the blog status is changed to 'undeleted'. | 
| 390 |                 * | 
| 391 |                 * @since 3.5.0 | 
| 392 |                 * | 
| 393 |                 * @param int $blog_id Blog ID. | 
| 394 |                 */ | 
| 395 |                do_action( 'make_undelete_blog', $blog_id ); | 
| Line | Code | 
| 790 |                /** This filter is documented in wp-includes/ms-blogs.php */ | 
| 791 |                do_action( 'archive_blog', $blog_id ); | 
| 792 |           } else { | 
| 793 |                /** This filter is documented in wp-includes/ms-blogs.php */ | 
| 794 |                do_action( 'unarchive_blog', $blog_id ); | 
| 795 |           } | 
| 796 |      } elseif ( 'deleted' == $pref ) { | 
| 797 |           if ( $value == 1 ) { | 
| 798 |                /** This filter is documented in wp-includes/ms-blogs.php */ | 
| 799 |                do_action( 'make_delete_blog', $blog_id ); | 
| 800 |           } else { | 
| 801 |                /** This filter is documented in wp-includes/ms-blogs.php */ | 
| 802 |                do_action( 'make_undelete_blog', $blog_id ); | 
| 803 |           } | 
| 804 |      } elseif ( 'public' == $pref ) { | 
| 805 |           /** | 
| 806 |            * Fires after the current blog's 'public' setting is updated. | 
| 807 |            * | 
| 808 |            * @since MU |