Add footer widget on wordpress

// In function.php
$args = array(
'name' => __( 'Sidebar name', 'theme_text_domain' ),
'id' => 'unique-sidebar-id',
'description' => '',
'class' => '',
'before_widget' => '

',
'before_title' => '

',
'after_title' => '

' );

register_sidebar( $args );

// In the footer
dynamic_sidebar('footer-sidebar-1'); ?>