Disable dashboard Widgets

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<?php
function remove_dashboard_widgets() {
  global $wp_meta_boxes;
  unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_plugins']);
  unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_recent_comments']);
  unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_incoming_links']);
  unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_right_now']);
  unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_primary']);
  unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary']);
  unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_quick_press']);
  unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_recent_drafts']);
}
add_action('wp_dashboard_setup', 'remove_dashboard_widgets' );
?>

Instructions:

This snippet disables dashboard widgets, like Right Now or Incoming Links. You can find all the dashboard widgets here: WordPress.org.

It’s also possible to add your own dashboard widgets.

Related links:

http://codex.wordpress.org/Dashboard_Widgets_API