Session is not holding the data When I use wordpress

Code:
&lt;?php

/**

 * The template for displaying Search Results pages.

 *

 * @package WordPress

 * @subpackage Twenty_Eleven

 * @since Twenty Eleven 1.0

 */





get_header(); ?&gt;



  <section id="primary">

   <div id="content" role="main">



   &lt;?php if ( have_posts() ) : ?&gt;



    &lt;header class="page-header"&gt;

     <h1 class="page-title">&lt;?php printf( __( 'Search Results for: %s', 'twentyeleven' ), '<span>' . get_search_query() . '</span>' ); ?&gt;</h1>

    &lt;/header&gt;



    &lt;?php twentyeleven_content_nav( 'nav-above' ); ?&gt;



    &lt;?php /* Start the Loop */ ?&gt;

    &lt;?php while ( have_posts() ) : the_post(); ?&gt;



     &lt;?php

      /* Include the Post-Format-specific template for the content.

       * If you want to overload this in a child theme then include a file

       * called content-___.php (where ___ is the Post Format name) and that will be used instead.

       */

      get_template_part( 'content', get_post_format() );

     ?&gt;



    &lt;?php endwhile; ?&gt;



    &lt;?php twentyeleven_content_nav( 'nav-below' ); ?&gt;



   &lt;?php else : ?&gt;



    <article id="post-0" class="post no-results not-found">

     &lt;header class="entry-header"&gt;

      <h1 class="entry-title">&lt;?php _e( 'Nothing Found', 'twentyeleven' ); ?&gt;</h1>

     &lt;/header&gt;&lt;!-- .entry-header --&gt;



     <div class="entry-content">

      <p>&lt;?php _e( 'Sorry, but nothing matched your search criteria. Please try again with some different keywords.', 'twentyeleven' ); ?&gt;</p>

      &lt;?php get_search_form(); ?&gt;

     </div>&lt;!-- .entry-content --&gt;

    </article>&lt;!-- #post-0 --&gt;



   &lt;?php endif; ?&gt;



   </div>&lt;!-- #content --&gt;

  </section>&lt;!-- #primary --&gt;



&lt;?php get_sidebar(); ?&gt;

&lt;?php get_footer(); ?&gt;