gistfile1.php

	function modify_permalinks($permalink_structure, $category_base, $tag_base){
		global $wp_rewrite;

		$permalink_structure = preg_replace('#/+#', '/', '/' . $permalink_structure);
		$wp_rewrite->set_permalink_structure($permalink_structure);

		$category_base = preg_replace('#/+#', '/', '/' . $category_base);
		$wp_rewrite->set_category_base($category_base);

		$tag_base = preg_replace('#/+#', '/', '/' . $tag_base);
		$wp_rewrite->set_tag_base($tag_base);

		update_option('rewrite_rules', FALSE);
		$wp_rewrite->flush_rules($writable);
	}