wp_dashboard() WordPress Function

function wp_dashboard() {
	$screen      = get_current_screen();
	$columns     = absint( $screen->get_columns() );
	$columns_css = '';

	if ( $columns ) {
		$columns_css = " columns-$columns";
	}
	?>
<div id="dashboard-widgets" class="metabox-holder<?php echo $columns_css; ?>">
	<div id="postbox-container-1" class="postbox-container">
	<?php do_meta_boxes( $screen->id, 'normal', '' ); ?>
	</div>
	<div id="postbox-container-2" class="postbox-container">
	<?php do_meta_boxes( $screen->id, 'side', '' ); ?>
	</div>
	<div id="postbox-container-3" class="postbox-container">
	<?php do_meta_boxes( $screen->id, 'column3', '' ); ?>
	</div>
	<div id="postbox-container-4" class="postbox-container">
	<?php do_meta_boxes( $screen->id, 'column4', '' ); ?>
	</div>
</div>

	<?php
	wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false );
	wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false );

}