In functions.php:

	// Add widget-ready sidebars
    if (function_exists('register_sidebar')) {
    	register_sidebar(array(
    		'name' => 'Footer 1',
    		'id'   => 'footer1',
    		'description'   => 'These are widgets for the footer.',
			'before_widget' => '',
            'after_widget' => '',
    		'before_title'  => '<h6>',
    		'after_title'   => '</h6>'
    	));
    }
        if (function_exists('register_sidebar')) {
    	register_sidebar(array(
    		'name' => 'Footer 2',
    		'id'   => 'footer2',
    		'description'   => 'These are widgets for the footer.',
    		'before_title'  => '<h6>',
    		'after_title'   => '</h6>'
    	));
    }    if (function_exists('register_sidebar')) {
    	register_sidebar(array(
    		'name' => 'Footer 3',
    		'id'   => 'footer3',
    		'description'   => 'These are widgets for the footer.',
    		'before_title'  => '<h6>',
    		'after_title'   => '</h6>'
    	));
    }

In sidebar.php:

<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('Footer 1') ) : ?>
<p>This area is widgetised! To make use of this area, put some widgets in the 'Main Sidebar' section.</p>
<?php endif; ?>

<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('Footer 2') ) : ?>
<p>This area is widgetised! To make use of this area, put some widgets in the 'Main Sidebar' section.</p>
<?php endif; ?>

<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('Footer 3') ) : ?>
<p>This area is widgetised! To make use of this area, put some widgets in the 'Main Sidebar' section.</p>
<?php endif; ?>

WP: Insert Multiple Sidebars

wordpress

PHP