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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 |
|---|---|
| 810 | if ( $new_blog == $blog_id ) { |
| 811 | /** |
| 812 | * Fires when the blog is switched. |
| 813 | * |
| 814 | * @since MU |
| 815 | * |
| 816 | * @param int $new_blog New blog ID. |
| 817 | * @param int $new_blog Blog ID. |
| 818 | */ |
| 819 | do_action( 'switch_blog', $new_blog, $new_blog ); |
| 820 | $GLOBALS['switched'] = true; |
| 821 | return true; |
| 822 | } |
| 823 | |
| 824 | $wpdb->set_blog_id( $new_blog ); |
| 825 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| 826 | $prev_blog_id = $blog_id; |
| 827 | $GLOBALS['blog_id'] = $new_blog; |
| 828 | |
| Line | Code |
| 849 | } |
| 850 | |
| 851 | if ( did_action( 'init' ) ) { |
| 852 | $wp_roles = new WP_Roles(); |
| 853 | $current_user = wp_get_current_user(); |
| 854 | $current_user->for_blog( $new_blog ); |
| 855 | } |
| 856 | |
| 857 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 858 | do_action( 'switch_blog', $new_blog, $prev_blog_id ); |
| 859 | $GLOBALS['switched'] = true; |
| 860 | |
| 861 | return true; |
| 862 | } |
| 863 | |
| 864 | /** |
| 865 | * Restore the current blog, after calling switch_to_blog() |
| 866 | * |
| 867 | * @see switch_to_blog() |
| Line | Code |
| 882 | if ( empty( $GLOBALS['_wp_switched_stack'] ) ) { |
| 883 | return false; |
| 884 | } |
| 885 | |
| 886 | $blog = array_pop( $GLOBALS['_wp_switched_stack'] ); |
| 887 | $blog_id = get_current_blog_id(); |
| 888 | |
| 889 | if ( $blog_id == $blog ) { |
| 890 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 891 | do_action( 'switch_blog', $blog, $blog ); |
| 892 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 893 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 894 | return true; |
| 895 | } |
| 896 | |
| 897 | $wpdb->set_blog_id( $blog ); |
| 898 | $prev_blog_id = $blog_id; |
| 899 | $GLOBALS['blog_id'] = $blog; |
| 900 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| Line | Code |
| 923 | } |
| 924 | |
| 925 | if ( did_action( 'init' ) ) { |
| 926 | $wp_roles = new WP_Roles(); |
| 927 | $current_user = wp_get_current_user(); |
| 928 | $current_user->for_blog( $blog ); |
| 929 | } |
| 930 | |
| 931 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 932 | do_action( 'switch_blog', $blog, $prev_blog_id ); |
| 933 | |
| 934 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 935 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 936 | |
| 937 | return true; |
| 938 | } |
| 939 | |
| 940 | /** |
| 941 | * Determines if switch_to_blog() is in effect |