php7 msqli server behaviour

I am using xampp with PHP 7 and msqli server behaviours.

Fatal error: Uncaught Error: Call to undefined function mysql_select_db() in C:\xampp\htdocs\index.php:52 Stack trace: #0 {main} thrown in C:\xampp\htdocs\index.php on line 52

Any ideas?
This is after creating a login page and then logging in

<?php require_once('Connections/mbfConnection.php'); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")
{
if (PHP_VERSION < 6) {
$theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
}

$theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

switch ($theType) {
case "text":
$theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
break;
case "long":
case "int":
$theValue = ($theValue != "") ? intval($theValue) : "NULL";
break;
case "double":
$theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
break;
case "date":
$theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
break;
case "defined":
$theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
break;
}
return $theValue;
}
}
?>
<?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) {
session_start();
}

$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($_GET['accesscheck'])) {
$_SESSION['PrevUrl'] = $_GET['accesscheck'];
}

if (isset($_POST['email'])) {
$loginUsername=$_POST['email'];
$password=$_POST['password'];
$MM_fldUserAuthorization = "adminlevel";
$MM_redirectLoginSuccess = "/dashboard/";
$MM_redirectLoginFailed = "/";
$MM_redirecttoReferrer = false;
mysql_select_db($database_mbfConnection, $mbfConnection);

$LoginRS__query=sprintf("SELECT username, password, adminlevel FROM `user` WHERE username=%s AND password=%s",
GetSQLValueString($loginUsername, "text"), GetSQLValueString($password, "text"));

$LoginRS = mysql_query($LoginRS__query, $mbfConnection) or die(mysql_error());
$loginFoundUser = mysql_num_rows($LoginRS);
if ($loginFoundUser) {

$loginStrGroup = mysql_result($LoginRS,0,'adminlevel');

if (PHP_VERSION >= 5.1) {session_regenerate_id(true);} else {session_regenerate_id();}
//declare two session variables and assign them
$_SESSION['MM_Username'] = $loginUsername;
$_SESSION['MM_UserGroup'] = $loginStrGroup;

if (isset($_SESSION['PrevUrl']) && false) {
$MM_redirectLoginSuccess = $_SESSION['PrevUrl'];
}
header("Location: " . $MM_redirectLoginSuccess );
}
else {
header("Location: ". $MM_redirectLoginFailed );
}
}
?>
<!DOCTYPE html>

<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>AdminLTE 2 | Log in</title>

<meta content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" name="viewport">

<link rel="stylesheet" href="bower_components/bootstrap/dist/css/bootstrap.min.css">

<link rel="stylesheet" href="bower_components/font-awesome/css/font-awesome.min.css">

<link rel="stylesheet" href="bower_components/Ionicons/css/ionicons.min.css">

<link rel="stylesheet" href="dist/css/AdminLTE.min.css">

<link rel="stylesheet" href="plugins/iCheck/square/blue.css">






<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600,700,300italic,400italic,600italic">
</head>
<body class="hold-transition login-page">
<div class="login-box">
<div class="login-logo">
<b>MBF</b>Admin
</div>

<div class="login-box-body">
<p class="login-box-msg">Sign in to start your session</p>

<form action="<?php echo $loginFormAction; ?>" method="POST" name="login">
<div class="form-group has-feedback">
<input type="email" class="form-control" placeholder="Email" value="" name="email">
<span class="glyphicon glyphicon-envelope form-control-feedback"></span>
</div>
<div class="form-group has-feedback">
<input type="password" class="form-control" placeholder="Password" value="" name="password">
<span class="glyphicon glyphicon-lock form-control-feedback"></span>
</div>
<div class="row">
<div class="col-xs-8">
<div class="checkbox icheck">
<label>
<input type="checkbox"> Remember Me
</label>
</div>
</div>

<div class="col-xs-4">
<button type="submit" class="btn btn-primary btn-block btn-flat">Sign In</button>
</div>

</div>
</form>

<a href="#">I forgot my password</a><br>

</div>

</div>



<script src="bower_components/jquery/dist/jquery.min.js"></script>

<script src="bower_components/bootstrap/dist/js/bootstrap.min.js"></script>

<script src="plugins/iCheck/icheck.min.js"></script>
<script>
$(function () {
$('input').iCheck({
checkboxClass: 'icheckbox_square-blue',
radioClass: 'iradio_square-blue',
increaseArea: '20%' /* optional */
});
});
</script>
</body>
</html>
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4/03/2018 12:29 pmsmithdunn123