code of my chat app for Michiman

chat.html:
<!DOCTYPE HTML>
<html>
	<head>
		<script>
			setInterval(
			function getChatMessages () {
				if(window.XMLHttpRequest){
					xmlhttp = new XMLHttpRequest();
				}
				else{
					xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
				}
				xmlhttp.onreadystatechange = function () {
					if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
						document.getElementById("chat").innerHTML = xmlhttp.responseText;
					}
				}
				xmlhttp.open("GET", "gchat.php", true);
				xmlhttp.send();
			}, 1);
		</script>
		<link href="chatStyle.css" rel="stylesheet">
	</head>
	<body style="background-color:gray">
		<div class="main-chat-wrapper">
			<div class="listusers">
				All users:<br/>
				<a href="users/foo">foo</a>, <a href="/users/bar">bar</a>
			</div>
			<div class="chat-wrapper">
				<div class="chat-output-feed" id="chat">

				</div>
				<form action="chat.php">
					Send a message to your friends:
					<input class="msg" type="text" name="msg" />
					<input type="submit" value="Send!" />
				</form>
			</div>
		</div>
	</body>
</html>
chat.php:
<?php

$server = "tcp:s0rq688sz1.database.windows.net,1433";
$user = "raumaan@s0rq688sz1";
$pwd = "Qwertyuiop1";
$db = "raumaansql";

$connectionInfo = array("UID" => "raumaan@s0rq688sz1", "pwd" => "Qwertyuiop1", "Database" => "raumaansql", "LoginTimeout" => 30, "Encrypt" => 1);
$serverName = "tcp:s0rq688sz1.database.windows.net,1433";

$conn = sqlsrv_connect($serverName, $connectionInfo);

if($conn === false){
	die(print_r(sqlsrv_errors()));
}
$sql = "INSERT INTO chat VALUES ('foo',?)";
$params = array($_GET['msg']);
$stmt = sqlsrv_query($conn, $sql, $params);
if($stmt === false){
	die(print_r(sqlsrv_errors(), true));
}
sqlsrv_close($conn);
?>
<!DOCTYPE HTML><html><head><meta http-equiv="refresh" content="0;url=chat.html"/></head></html>
gchat.php:
<?php
$server = "tcp:s0rq688sz1.database.windows.net,1433";
$user = "raumaan@s0rq688sz1";
$pwd = "Qwertyuiop1";
$db = "raumaansql";

$connectionInfo = array("UID" => "raumaan@s0rq688sz1", "pwd" => "Qwertyuiop1", "Database" => "raumaansql", "LoginTimeout" => 30, "Encrypt" => 1);
$serverName = "tcp:s0rq688sz1.database.windows.net,1433";

$conn = sqlsrv_connect($serverName, $connectionInfo);

if($conn === false){
	die(print_r(sqlsrv_errors()));
}
$sql = "SELECT * FROM chat";
$stmt = sqlsrv_query($conn, $sql);
if($stmt === false){
	die(print_r(sqlsrv_errors(), true));
}
while($row = sqlsrv_fetch_array($stmt)) {
	echo $row['username'] . "&#155; " . $row['message'] . "<br/>";
}
sqlsrv_close($conn);
?>
link: raumaan.azurewebsites.net/chat.html