WordPress : How to find out the current template being used for current page

gistfile1.txt

//http://www.wpinsite.com/code-snippets/how-to-get-the-name-of-the-current-wordpress-page-template
//https://wordpress.org/support/topic/get-name-of-page-template-on-a-page
/**
 * Get the name of the current page template name. 
 * @return string
 */
function get_page_template_name() {
  if(is_page()) {
    global $post;
 
    return str_replace('.php', '', get_post_meta($post->ID, '_wp_page_template', true));   
  }
  return '';
}