Removes all the widgets from the WordPress dashboard screen for all non-admin users.

Remove-WordPress-Dashboard-Widgets.php

// function to remove the dashboard widgets, but only for non-admin users
// if you want to remove the widgets for admin(s) too, remove the 'if' statement within the function
function remove_dashboard_widgets() {
	if ( ! current_user_can( 'manage_options' ) ) {	
		remove_meta_box( 'dashboard_right_now', 'dashboard', 'normal' );
		remove_meta_box( 'dashboard_recent_comments', 'dashboard', 'normal' );
		remove_meta_box( 'dashboard_incoming_links', 'dashboard', 'normal' );
		remove_meta_box( 'dashboard_plugins', 'dashboard', 'normal' );
		remove_meta_box( 'dashboard_quick_press', 'dashboard', 'side' );
		remove_meta_box( 'dashboard_recent_drafts', 'dashboard', 'side' );
		remove_meta_box( 'dashboard_primary', 'dashboard', 'side' );
		remove_meta_box( 'dashboard_secondary', 'dashboard', 'side' );
	}
}
// 
add_action( 'wp_dashboard_setup', 'remove_dashboard_widgets' );