Get template name by full URL

You can make use of the global $template which holds the complete path of the current template being use to display a page. From there you can manipulate the value to get the name of the template

As example, the value of $template looks like this: (This is on my localhost on my PC)

E:\xammp\htdocs\wordpress/wp-content/themes/pietergoosen2014/page-test.php

To only return the page-test.php part, I use the following function which uses the PHP functions substr and strrpos which finds the last / character in URL and then returns everything after that:

function get_current_template() {
    global $template;
    return substr( $template, strrpos( $template, "https://wordpress.stackexchange.com/" ) + 1 );
}

You can then use it anywhere in your template like

echo get_current_template();

I usually just print the template name in my site’s header on my localhost like

add_action( 'wp_head', function () 
{
    global $template;
    print substr( $template, strrpos( $template, "https://wordpress.stackexchange.com/" ) + 1 );
});

or

add_action( 'wp_head', function () 
{
    global $template;
    print $template;
});