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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 4 times in this file.
| Line | Code |
|---|---|
| 622 | if ( $new_blog == $GLOBALS['blog_id'] ) { |
| 623 | /** |
| 624 | * Fires when the blog is switched. |
| 625 | * |
| 626 | * @since MU |
| 627 | * |
| 628 | * @param int $new_blog New blog ID. |
| 629 | * @param int $new_blog Blog ID. |
| 630 | */ |
| 631 | do_action( 'switch_blog', $new_blog, $new_blog ); |
| 632 | $GLOBALS['switched'] = true; |
| 633 | return true; |
| 634 | } |
| 635 | |
| 636 | $wpdb->set_blog_id( $new_blog ); |
| 637 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| 638 | $prev_blog_id = $GLOBALS['blog_id']; |
| 639 | $GLOBALS['blog_id'] = $new_blog; |
| 640 | |
| Line | Code |
| 661 | } |
| 662 | |
| 663 | if ( did_action( 'init' ) ) { |
| 664 | wp_roles()->reinit(); |
| 665 | $current_user = wp_get_current_user(); |
| 666 | $current_user->for_blog( $new_blog ); |
| 667 | } |
| 668 | |
| 669 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 670 | do_action( 'switch_blog', $new_blog, $prev_blog_id ); |
| 671 | $GLOBALS['switched'] = true; |
| 672 | |
| 673 | return true; |
| 674 | } |
| 675 | |
| 676 | /** |
| 677 | * Restore the current blog, after calling switch_to_blog() |
| 678 | * |
| 679 | * @see switch_to_blog() |
| Line | Code |
| 692 | global $wpdb; |
| 693 | |
| 694 | if ( empty( $GLOBALS['_wp_switched_stack'] ) ) |
| 695 | return false; |
| 696 | |
| 697 | $blog = array_pop( $GLOBALS['_wp_switched_stack'] ); |
| 698 | |
| 699 | if ( $GLOBALS['blog_id'] == $blog ) { |
| 700 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 701 | do_action( 'switch_blog', $blog, $blog ); |
| 702 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 703 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 704 | return true; |
| 705 | } |
| 706 | |
| 707 | $wpdb->set_blog_id( $blog ); |
| 708 | $prev_blog_id = $GLOBALS['blog_id']; |
| 709 | $GLOBALS['blog_id'] = $blog; |
| 710 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| Line | Code |
| 732 | } |
| 733 | |
| 734 | if ( did_action( 'init' ) ) { |
| 735 | wp_roles()->reinit(); |
| 736 | $current_user = wp_get_current_user(); |
| 737 | $current_user->for_blog( $blog ); |
| 738 | } |
| 739 | |
| 740 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 741 | do_action( 'switch_blog', $blog, $prev_blog_id ); |
| 742 | |
| 743 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 744 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 745 | |
| 746 | return true; |
| 747 | } |
| 748 | |
| 749 | /** |
| 750 | * Determines if switch_to_blog() is in effect |