Pulling active installs & version number from wordpress.org

I’ve found my original function but it seems to be broken and I’ve no idea whats wrong:

function te_get_theme_information( $args ) {
      $theme = "";
      // Set the $request array
      $request = array(
          'body' => array(
              'action' => 'theme_information',
              'request' => serialize((object)$args)
          )
      );
  
      // Generate a cache key that would hold the response for this request:
      $key='te_theme_'.md5(serialize($request));
  
      // Check transient. If it's there - use that, if not re fetch the theme
      if ( false === ($theme = get_transient($key)) ) {
  
          // Theme not found - we need to re-fetch it
          $response = wp_remote_post('http://api.wordpress.org/themes/info/1.0/',$request);
  
          if ( is_wp_error($response) )
              return $response;
  
          $theme = unserialize(wp_remote_retrieve_body($response));
  
          if ( !is_object($theme) && !is_array($theme) )
              return new WP_Error('theme_api_error', 'An unexpected error has occurred');
  
          // Set transient for next time... keep it for 24 hours should be good
          set_transient($key, $theme, 60*60*24);
      }
  
      return $theme;
  }

Here’s the call to it:
$themeinfo = te_get_theme_information(array('slug' => $slug, 'ratings' => true));

If you have any idea of whats wrong with the above I’d be very grateful.

Thanks
Steven