How to test a php login connected to a mysql db through xampp?

php mysql login directory xampp

PHP Snippet 1:

include "../storescripts/connect_to_mysql.php";

PHP Snippet 2:

include "C:\xampp\htdocs\myonlinestore\storescripts\connect_to_mysql.php";

PHP Snippet 3:

<?php
   $server = "localhost";
   $connection = mysqli_connect ($server,"root","","your_database_name");
   if(!$connection){
    // if not connected it will gives the error here
    echo "server not found".mysql_error();
}   
else{
    echo "Connected";
}
?>