wp+footer.php
add_action( 'init', 'cust_widget' );
function cust_widget()
{
register_sidebar( array(
'name' => 'Widget1',
'id' => 'cust_footer_1',
'before_widget' => '<div class="cst_widget">',
'after_widget' => '</div>'
) );
register_sidebar( array(
'name' => 'Widget2',
'id' => 'cust_footer_2',
'before_widget' => '<div class="cst_widget">',
'after_widget' => '</div>'
) );
register_sidebar( array(
'name' => 'Widget3',
'id' => 'footer-3',
'before_widget' => '<div class="cst_widget">',
'after_widget' => '</div>'
) );
register_sidebar( array(
'name' => 'footer-4',
'id' => 'footer-4',
'before_widget' => '<div class="cst_widget">',
'after_widget' => '</div>'
) );
}