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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 | 
|---|---|
| 627 |      $wpdb->update( $wpdb->blogs, array($pref => $value, 'last_updated' => current_time('mysql', true)), array('blog_id' => $blog_id) ); | 
| 628 |  | 
| 629 |      refresh_blog_details($blog_id); | 
| 630 |  | 
| 631 |      if ( 'spam' == $pref ) | 
| 632 |           ( $value == 1 ) ? do_action( 'make_spam_blog', $blog_id ) :     do_action( 'make_ham_blog', $blog_id ); | 
| 633 |      elseif ( 'mature' == $pref ) | 
| 634 |           ( $value == 1 ) ? do_action( 'mature_blog', $blog_id ) : do_action( 'unmature_blog', $blog_id ); | 
| 635 |      elseif ( 'archived' == $pref ) | 
| 636 |           ( $value == 1 ) ? do_action( 'archive_blog', $blog_id ) : do_action( 'unarchive_blog', $blog_id ); | 
| 637 |      elseif ( 'archived' == $pref ) | 
| 638 |           ( $value == 1 ) ? do_action( 'archive_blog', $blog_id ) : do_action( 'unarchive_blog', $blog_id ); | 
| 639 |  | 
| 640 |      return $value; | 
| 641 | } | 
| 642 |  | 
| 643 | /** | 
| 644 |  * Get a blog details field. | 
| 645 |  * | 
| 646 |  * @since MU | 
| 647 |  * |