<?php
$host="mysql14.000webhost.com"; // Host name
$username="a6524640_member"; // Mysql username
$password="password"; // Mysql password
$db_name="a6524640_social"; // Database name
$tbl_name="member"; // Table name

// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");

session_start();
$username = $_SESSION['username'];

$query = mysql_query("UPDATE member SET status='Online' WHERE username='$username'") or die(mysql_error());

?>