Deploying PHP site

I have installed the LAMP configuration and copied a PHP site to the server. I am using dfconfig file with DB connection setup as below:

$servername = “localhost”; $username = “username”; $password = “password”;

$dbname = “instarld_instacks”;

$conn = new mysqli($servername, $username, $password, $dbname); // Check connection if ($conn->connect_error) { die("Connection failed: " . $conn->connect_error); }

When tried to open my website, I am getting this: This Page isnt working. Domain unable to handle the request.

Opening html pages doesnt have this issue.

Can anyone help me deploying my website?