A PHP program to create database connection & check the connection

<?php
$servername = "localhost";
$username = 'root';        // your database system username
$password = 'pas123';  //your database system password

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

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