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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 |
|---|---|
| 783 | if ( $new_blog == $blog_id ) { |
| 784 | /** |
| 785 | * Fires when the blog is switched. |
| 786 | * |
| 787 | * @since MU |
| 788 | * |
| 789 | * @param int $new_blog New blog ID. |
| 790 | * @param int $new_blog Blog ID. |
| 791 | */ |
| 792 | do_action( 'switch_blog', $new_blog, $new_blog ); |
| 793 | $GLOBALS['switched'] = true; |
| 794 | return true; |
| 795 | } |
| 796 | |
| 797 | $wpdb->set_blog_id( $new_blog ); |
| 798 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| 799 | $prev_blog_id = $blog_id; |
| 800 | $GLOBALS['blog_id'] = $new_blog; |
| 801 | |
| Line | Code |
| 822 | } |
| 823 | |
| 824 | if ( did_action( 'init' ) ) { |
| 825 | $wp_roles = new WP_Roles(); |
| 826 | $current_user = wp_get_current_user(); |
| 827 | $current_user->for_blog( $new_blog ); |
| 828 | } |
| 829 | |
| 830 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 831 | do_action( 'switch_blog', $new_blog, $prev_blog_id ); |
| 832 | $GLOBALS['switched'] = true; |
| 833 | |
| 834 | return true; |
| 835 | } |
| 836 | |
| 837 | /** |
| 838 | * Restore the current blog, after calling switch_to_blog() |
| 839 | * |
| 840 | * @see switch_to_blog() |
| Line | Code |
| 855 | if ( empty( $GLOBALS['_wp_switched_stack'] ) ) { |
| 856 | return false; |
| 857 | } |
| 858 | |
| 859 | $blog = array_pop( $GLOBALS['_wp_switched_stack'] ); |
| 860 | $blog_id = get_current_blog_id(); |
| 861 | |
| 862 | if ( $blog_id == $blog ) { |
| 863 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 864 | do_action( 'switch_blog', $blog, $blog ); |
| 865 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 866 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 867 | return true; |
| 868 | } |
| 869 | |
| 870 | $wpdb->set_blog_id( $blog ); |
| 871 | $prev_blog_id = $blog_id; |
| 872 | $GLOBALS['blog_id'] = $blog; |
| 873 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| Line | Code |
| 896 | } |
| 897 | |
| 898 | if ( did_action( 'init' ) ) { |
| 899 | $wp_roles = new WP_Roles(); |
| 900 | $current_user = wp_get_current_user(); |
| 901 | $current_user->for_blog( $blog ); |
| 902 | } |
| 903 | |
| 904 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 905 | do_action( 'switch_blog', $blog, $prev_blog_id ); |
| 906 | |
| 907 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 908 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 909 | |
| 910 | return true; |
| 911 | } |
| 912 | |
| 913 | /** |
| 914 | * Determines if switch_to_blog() is in effect |