$db_name = "foo";
$connection = @mysql_connect("myserver", "myuser", "mypw") or die("Could not connect to database");
mysql_select_db($db_name, $connection) or die("Count not select database");

// 1st (uncomment and add config):
include_path = "C:phpincludes"

// <2nd (uncomment):
extension_dir = "ext"

// 3rd (uncomment and edit config):
extension=C:/PHP/ext/php_mysql.dll
extension=C:/PHP/ext/php_mysqli.dll

<?php
$servername = "localhost";
$username = "root";
$password = "";

// Create connection
$conn = new mysqli($servername, $username, $password);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
?>