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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 |
|---|---|
| 779 | if ( $new_blog == $GLOBALS['blog_id'] ) { |
| 780 | /** |
| 781 | * Fires when the blog is switched. |
| 782 | * |
| 783 | * @since MU |
| 784 | * |
| 785 | * @param int $new_blog New blog ID. |
| 786 | * @param int $new_blog Blog ID. |
| 787 | */ |
| 788 | do_action( 'switch_blog', $new_blog, $new_blog ); |
| 789 | $GLOBALS['switched'] = true; |
| 790 | return true; |
| 791 | } |
| 792 | |
| 793 | $wpdb->set_blog_id( $new_blog ); |
| 794 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| 795 | $prev_blog_id = $GLOBALS['blog_id']; |
| 796 | $GLOBALS['blog_id'] = $new_blog; |
| 797 | |
| Line | Code |
| 818 | } |
| 819 | |
| 820 | if ( did_action( 'init' ) ) { |
| 821 | wp_roles()->reinit(); |
| 822 | $current_user = wp_get_current_user(); |
| 823 | $current_user->for_blog( $new_blog ); |
| 824 | } |
| 825 | |
| 826 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 827 | do_action( 'switch_blog', $new_blog, $prev_blog_id ); |
| 828 | $GLOBALS['switched'] = true; |
| 829 | |
| 830 | return true; |
| 831 | } |
| 832 | |
| 833 | /** |
| 834 | * Restore the current blog, after calling switch_to_blog() |
| 835 | * |
| 836 | * @see switch_to_blog() |
| Line | Code |
| 849 | global $wpdb; |
| 850 | |
| 851 | if ( empty( $GLOBALS['_wp_switched_stack'] ) ) |
| 852 | return false; |
| 853 | |
| 854 | $blog = array_pop( $GLOBALS['_wp_switched_stack'] ); |
| 855 | |
| 856 | if ( $GLOBALS['blog_id'] == $blog ) { |
| 857 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 858 | do_action( 'switch_blog', $blog, $blog ); |
| 859 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 860 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 861 | return true; |
| 862 | } |
| 863 | |
| 864 | $wpdb->set_blog_id( $blog ); |
| 865 | $prev_blog_id = $GLOBALS['blog_id']; |
| 866 | $GLOBALS['blog_id'] = $blog; |
| 867 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| Line | Code |
| 889 | } |
| 890 | |
| 891 | if ( did_action( 'init' ) ) { |
| 892 | wp_roles()->reinit(); |
| 893 | $current_user = wp_get_current_user(); |
| 894 | $current_user->for_blog( $blog ); |
| 895 | } |
| 896 | |
| 897 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 898 | do_action( 'switch_blog', $blog, $prev_blog_id ); |
| 899 | |
| 900 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 901 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 902 | |
| 903 | return true; |
| 904 | } |
| 905 | |
| 906 | /** |
| 907 | * Determines if switch_to_blog() is in effect |