WordPress: How to create left sidebar template in TwentyEleven theme?

wordpress I’m modifying twentyeleven theme to have a left sidebar template for my page. By default twentyeleven have a sidebar template that showing the sidebar at the right column. To have a bit more choices for my new page, i would like to create a left sidebar template.

To create left sidebar template in WordPress TwentyEleven theme, follow the steps below:

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Go to the twentyeleven theme folder and duplicate the file sidebar-page.php to a new filename sidebar-left-page.php (make sure your filename is exactly the same as this)
Now open this sidebar-left-page.php using text editor and change the “Template Name” to “Left Sidebar Template” and save it.

Now copy the content below and paste it at the end of functions.php file.

function twentyeleven_leftsidebar_ptemplate_body_classes( $wp_classes, $extra ){
  $classes = array();
  if( is_page_template( 'sidebar-left-page.php' ) ) :
  // correction for the Left Sidebar Template
    $classes[] = 'left-sidebar';
    $blacklist = array('right-sidebar','singular');
    // Filter the body classes
    foreach( $blacklist as $val ) {
      if (!in_array($val, $wp_classes)) : continue;
      else:
      foreach($wp_classes as $key => $value) {
        if ($value == $val) unset($wp_classes[$key]);
      }
      endif;
    }
  endif;

  if( is_page_template( 'sidebar-right-page.php' ) ) :
  // correction for the Right Sidebar Template
    $classes[] = 'right-sidebar';
    $blacklist = array('left-sidebar','singular');
    // Filter the body classes
    foreach( $blacklist as $val ) {
      if (!in_array($val, $wp_classes)) : continue;
      else:
      foreach($wp_classes as $key => $value) {
        if ($value == $val) unset($wp_classes[$key]);
      }
      endif;
    }
  endif;

return array_merge($wp_classes, (array) $extra, $classes );
}
add_filter( 'body_class', 'twentyeleven_leftsidebar_ptemplate_body_classes', 20, 2 );

Once the file is saved. You may edit any of your page and you will see “Left Sidebar Template” as one of the option under “Page Attributes” -> “Template”.
Try to select this “Left Sidebar Template” as the page template and save then do a preview and you should see the sidebar showing at the left column now!