<?php

$host = "host";
$user = "user";
$pass = "pass";
$database = "database";

$username = $_POST['username'];
$exp = $_POST['exp'];

$db = mysqli_connect($host,$user,$pass,$database) or die ('ERROR: Could not connect to database!');
mysqli_select_db($db, $database) or die ("ERROR: Could not connect to database!");


{
$ins = mysqli_query($db, "UPDATE UserInfo SET xp=xp+" . $exp . " WHERE username = '".$username."';");
if ($ins)
{
echo "Succesfully Updated!";
}
else
{
die ("Error!" . mysql_error());
}
}


?>