widgets.php

$dynamic_widget_areas = array (
				'sidebar-21'       => __( 'Page Specific Sidebar 1', 'pietergoosen' ),
				'sidebar-22'       => __( 'Page Specific Sidebar 2', 'pietergoosen' ),
				'sidebar-23'       => __( 'Page Specific Sidebar 3', 'pietergoosen' ),
				'sidebar-24'       => __( 'Page Specific Sidebar 4', 'pietergoosen' ),
				'sidebar-25'       => __( 'Page Specific Sidebar 5', 'pietergoosen' ),
				'sidebar-26'       => __( 'Page Specific Sidebar 6', 'pietergoosen' ),
				'sidebar-27'       => __( 'Page Specific Sidebar 7', 'pietergoosen' ),
				'sidebar-28'       => __( 'Page Specific Sidebar 8', 'pietergoosen' ),
				'sidebar-29'	   => __( 'Page Specific Sidebar 9', 'pietergoosen' ),
				'sidebar-30'       => __( 'Page Specific Sidebar 10', 'pietergoosen' ),
                );

foreach ( $dynamic_widget_areas as $id => $dynamic_widget_area ) {
	register_sidebar(
		array (
                'name'          => __( $dynamic_widget_area, 'pietergoosen' ),
                'id'            =>  $id,
				'description'   => __( 'Page specific sidebars above the content sidebar', 'pietergoosen' ),
				'before_widget' => '<aside id="%1$s" class="widget %2$s">',
				'after_widget'  => '</aside>',
				'before_title'  => '<h1 class="widget-title">',
				'after_title'   => '</h1>',
        ));
    }
}
add_action( 'widgets_init', 'pietergoosen_widgets_init' );

// Add dynamic sidebars
add_action('admin_init', 'sidebar_init');
	add_action('save_post', 'save_sidebar_link');
	function sidebar_init(){
		add_meta_box("sidebar_meta", "Sidebar options", "sidebar_link", "page", "side", "default");
	}
	function sidebar_link(){
		global $post, $dynamic_widget_areas;
		$custom  = get_post_custom($post->ID);
		$link    = $custom["_sidebar"][0];
	?>
<div class="link_header">
	<?
	echo '<select name="link" class="sidebar-selection">';
	echo '<option>Choose Sidebar</option>';
	echo '<option>No sidebars to choose from</option>';
	foreach ( $dynamic_widget_areas as $list ){
		    if($link == $list){
		      echo '<option value="'.$list.'" selected="true">'.$list.'</option>';
			}else{
		      echo '<option value="'.$list.'">'.$list.'</option>';
			}
		}
	echo '</select><br />';
	?>
</div>
<p>Choose the sidebar to use with this page.</p>
<?php
}
function save_sidebar_link(){
global $post;
if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {return $post->ID;}
	update_post_meta($post->ID, "_sidebar", $_POST["link"]);
}
add_action('admin_head', 'sidebar_css');
function sidebar_css() {
	echo'
	<style type="text/css">
		.sidebar-selection{width:100%;}
	</style>
	';
}