Add custom variable to PHP Mail script - php

Question

<?php
session_start();
$_SESSION['dnevne'] = $dnevne;
$email_to = "marioznik#gmail.com";
$name = $_POST["name"];
$email_from = $_POST["email"];
$message = $_POST["message"];
$email_subject = "Price is: $dnevne ";
$headers = "From: " . $email_from . "\n";
$headers .= "Reply-To: " . $email_from . "\n";
ini_set("sendmail_from", $email_from);
$sent = mail($email_to, $email_subject, $message, $headers, "-f" .$email_from);
if ($sent)
{
header("Location: http://www.yourdomain.com/thankyou.html");
} else {
echo "There has been an error sending your comments. Please try later.";
}
?>
I add few reccomended things, but still i can't get $dnevne variable to my e-mail. Where is my mistake?

Answer 1

As you define a variable : $dnevna = $nocna + $ukupno on your 1st page, then, I recommand putting this value in a hidden input of the form (so user can't mess with it), then access it through $dnevna = $_POST['dnevna'];
The same thing your are doing with $name = $_POST["name"]; $email_from = $_POST["email"]; $message = $_POST["message"];
Then, you use PHP doc -> mail to make your email formatted as you need, include all needed data, and send it to you...
No need to worry about sessionif you're not using them before...

Answer 2

You need to learn to use sessions. Put session_start(); at the top of each page where you want to use a session variable.
Then add your $xyz variable to it as follows: $_SESSION['xyz'] = $xzy;
Then that variable is accessible anywhere that you're using sessions.