如果你看看the question you found 您可以看到用户找到了钩子wpmu_deactivate_blog 在…上wpseek.com.

正在搜索delete_blog 我在这里：delete_blog. 我想delete_blog 就是你要找的钩子。试试看，也许你可以自己确认一下。

From the WP3.0 source:

function wpmu_delete_blog( $blog_id, $drop = false ) {
    global $wpdb;

    $switch = false;
    if ( get_current_blog_id() != $blog_id ) {
        $switch = true;
        switch_to_blog( $blog_id );
    }

    $blog = get_blog_details( $blog_id );
    /**
     * Fires before a blog is deleted.
     *
     * @since MU
     *
     * @param int  $blog_id The blog ID.
     * @param bool $drop    True if blog\'s table should be dropped. Default is false.
     */
    do_action( \'delete_blog\', $blog_id, $drop );