Change text upon redirect from certain page...? - php

Question

As the title suggests I am trying to use the same .php page and have it display something new upon being redirected from a particular location.
In context...
I have a login which upon successful login redirects to a home page but if unsuccessful, redirects to the index. Is there a way that I can tell my index page to display an "Error logging in" message when it has been redirected from my login page?
Here is my login code...
<?php
session_start();
include('conn.php');
$query = "SELECT * FROM User";
$result = mysqli_query($conn, $query) or die(mysqli_error($conn));
if (isset($_POST["submit"])) {
$logEmail = $conn->real_escape_string($_POST['logEmail']);
$logPass = $conn->real_escape_string($_POST['logPass']);
$checkuser = "SELECT * FROM User WHERE Email='$logEmail' AND UserPassword=AES_ENCRYPT('$logPass', 'MyKey')";
$userresult = mysqli_query($conn, $checkuser) or die(mysqli_error($conn));
$loginsucc = (mysqli_num_rows($userresult) > 0);
if (mysqli_num_rows($userresult) > 0) {
while ($row = mysqli_fetch_assoc($userresult)) {
$userPriKey = $row['UserID'];
$userid = $row['Email'];
$accounttype = $row['IsAdmin'];
$firstname = $row['FirstName'];
$surname = $row['LastName'];
$_SESSION['userPriKey'] = $userPriKey;
$_SESSION['name'] = $firstname;
$_SESSION['surname'] = $surname;
$_SESSION['Email'] = $userid;
$_SESSION['IsAdmin'] = $accounttype;
if($accounttype == '1'){
header("Location: home.php");
}else if ($accounttype == '0'||$accounttype == NULL ) {
header("Location: userhome.php");
}
}
} else {
header("Location: index.php");
}
}
?>

Answer 1

Before you call header() set a session variable like so
$_SESSION['msg'] = 'success you are logged in';
header('Location: page.php');
exit;
Then in page.php,
session_start();
if (isset($_SESSION['msg'])) {
echo $_SESSION['msg'];
unset($_SESSION['msg']);
}
Also FYI, you should be using prepared statements. Your code is not totally safe