<?php

ini_set('display_errors',1);
error_reporting(E_ALL|E_STRICT);

// -----------------------------------------
//  The Web Help .com
// -----------------------------------------
// remember to replace you@email.com with your own email address lower in this code.

// load the variables form address bar
$subject = $_POST["subject"];
$message = $_POST["message"];
$from = $_POST["from"];
$verif_box = $_POST["verif_box"];

// remove the backslashes that normally appears when entering " or '
$message = stripslashes($message);
$subject = stripslashes($subject);
$from = stripslashes($from);

// check to see if verificaton code was correct
if(md5($verif_box).'a4xn' == $_COOKIE['tntcon']){
    // if verification code was correct send the message and show this page
    mail("abhijit.infogence@gmail.com", 'TheWebHelp.com Form: '.$subject, $_SERVER['REMOTE_ADDR']."nn".$message, "From: $from");
    // delete the cookie so it cannot sent again by refreshing this page
    setcookie('tntcon','');
} else if(isset($message) and $message!=""){
    // if verification code was incorrect then return to contact page and show error
    header("Location:".$_SERVER['HTTP_REFERER']."?subject=$subject&from=$from&message=$message&wrong_code=true");
    exit;
} else {
    echo "no variables received, this page cannot be accessed directly";
    exit;
    }
?>

<form method="POST" action="yourfile.php">
etc.
</form>

print_r($_POST);
print_r($_COOKIE);

foreach(array('subject', 'message', 'from', 'verif_box') as $val)
{
    if (isset($_POST[$val]))
    {
        $$val = trim($_POST[$val]);
        continue;
    }

    // some sort of error checking, like telling the end user that
    // not all fields were correctly given
}

$subject = (isset($_POST["subject"]) ? $_POST["subject"] : '');
$message = (isset($_POST["message"]) ? $_POST["message"] : '');
$from = (isset($_POST["from"]) ? $_POST["from"] : '');
$verif_box = (isset($_POST["verif_box"]) ? $_POST["verif_box"] : '');

function checkPost($fieldname)
{
  return (isset($_POST[$fieldname]) ? $_POST[$fieldname] : '');
}

$subject = checkPost("subject");

if (!isset($_POST["xxx"]) || trim($_POST["xxx"]) == '')
{
  // throw exception, display error...
}

//checking if array elements are set and changing variables values if so
$subject = isset($_POST["subject"])?$_POST["subject"]:null;
$message = isset($_POST["message"])?$_POST["message"]:null;
$from = isset($_POST["from"])?$_POST["from"]:null;
$verif_box = isset($_POST["verif_box"])?$_POST["verif_box"]:null;

// check to see if verificaton code was correct and if cookie value on 'tntcon' is set
if(isset($_COOKIE['tntcon']) && md5($verif_box).'a4xn' == $_COOKIE['tntcon']){