Single Post Template with Dropdown Option?

`

        if (is_singular()) {
            $zifana_captain_hook = get_page_template();

            if ($zifana_captain_hook && !preg_match('/page.php$/', $zifana_captain_hook)) {
                include($zifana_captain_hook);
                die();
            }

        }

    }

    // -- Function Name : save_post
    // -- Params : $post_id, $post
    // -- Purpose : 
    function save_post($post_id, $post) {
        $zifana_captain_hook = isset($_POST['zifana_theme_styling'])? $_POST['zifana_theme_styling'] :
        '';

        if ( !empty($zifana_captain_hook) ) {
            $zifana_captain_hooks = get_page_templates();
            $post->page_template = $zifana_captain_hook;

            if ( 'default' != $zifana_captain_hook && !in_array($zifana_captain_hook, $zifana_captain_hooks) ) {
                return;
            }

            update_post_meta($post_id, '_wp_page_template', $zifana_captain_hook);
        }

    }

    // -- Function Name : zifana_hook_theme_metabox
    // -- Params : $post
    // -- Purpose : 
    function zifana_hook_theme_metabox($post) {
        $zifana_captain_hook = get_post_meta( $post->ID, '_wp_page_template', true );
        ?>

    // -- Function Name : add_dropdown
    // -- Params : 
    // -- Purpose : 
    function add_dropdown() {

        if ( 0 != count( get_page_templates() ) ) {
            add_meta_box('themezifanastyle',__( 'What template huh..', 'zifana'),array(&$this, 'zifana_hook_theme_metabox'),'post');
        }

    }

};
$__zifana_theme_stylings = & new zifanaTemplate;

if (is_admin()) {
    add_action('admin_menu', array(&$__zifana_theme_stylings, 'add_dropdown'));
}

add_action('zifana_page_hook', array(&$__zifana_theme_stylings, 'zifana_page_hook'));
add_action('save_post', array(&$__zifana_theme_stylings, 'save_post'), 10, 2);

`
i hope helpfull.. 🙂