wordpress remove all dashboard widgets

1// Main column (left): 
2// Browser Update Required
3$wp_meta_boxes['dashboard']['normal']['high']['dashboard_browser_nag']; 
4// PHP Update Required
5$wp_meta_boxes['dashboard']['normal']['high']['dashboard_php_nag']; 
6 
7// At a Glance
8$wp_meta_boxes['dashboard']['normal']['core']['dashboard_right_now'];
9// Right Now
10$wp_meta_boxes['dashboard']['normal']['core']['network_dashboard_right_now'];
11// Activity
12$wp_meta_boxes['dashboard']['normal']['core']['dashboard_activity'];
13// Site Health Status
14$wp_meta_boxes['dashboard']['normal']['core']['health_check_status'];
15 
16// Side Column (right): 
17// WordPress Events and News
18$wp_meta_boxes['dashboard']['side']['core']['dashboard_primary'];
19// Quick Draft, Your Recent Drafts
20$wp_meta_boxes['dashboard']['side']['core']['dashboard_quick_press']; 
21