Adding a meta box to determine the sidebar [closed]

Install metabox plugin and active:

/**** Add this code in your function.php ****/

$meta_boxes[] = array(
    'id' => 'post_sidebar',         
    'title' => 'post Sidebar',      
    'pages' => array('post'),       
    'priority' => 'low',            
    'fields' => array(          
            array(
                'name' => 'Post Sidebar',               
                 'id' => 'post_sidebar',        
                 'type' => 'select',                            
                 "options" => array( "0" => "OFF", "1" => "Left side", "2" => "Right Side"),
            ),
        )
);
if ( class_exists( 'RW_Meta_Box' ) )
{
    foreach ( $meta_boxes as $meta_box )
    {
        new RW_Meta_Box( $meta_box );
    }
}

/**** after single.php on get value using this one option ****/  

$sidebar_value = get_post_meta($post->ID,'post_sidebar',true);

if($sidebar_value == 1 && $sidebar_value!=0){
    // Add sidebar code for left side
}

if($sidebar_value=='2' && $sidebar_value!=0){
    // Add sidebar code for right side
}