<?php
$name = $email = $gender = $major = $years = $vip = "";

if(isset($_REQUEST["submit"])) {
	$name = $_REQUEST["name"];
    $name = filter_var($name, FILTER_SANITIZE_STRING);

    $email = $_REQUEST["email"];
    $email = filter_var($email, FILTER_VALIDATE_EMAIL);

    $gender = $_REQUEST["gender"];
    $major = $_REQUEST["major"];
    $fee = $_REQUEST["fee"];

    $years = $_REQUEST["years"];
    $years = filter_var($years, FILTER_VALIDATE_INT);

    $vip = $_REQUEST["vip"];

    if (!empty($name) && !empty($email)) {
    	echo "<b>Thank you for your registration. Here is your information we collected:</b><br>";
    	echo "Your Name: ".$name."<br>";
    	echo "Your Email: ".$email."<br>";
    	echo "Your Gender: ".$gender."<br>";
    	echo "Your Major: ".$major."<br>";
        echo "<hr>";

        if ($vip == "VIP")
        	$fee = 200;
        else
        	$fee = 100;

        if ($years > 3)
        	$fee = $fee - (0.30*$fee);

        echo "Your annual membership fee is: $".number_format((float)$fee, 2, '.', '');
    } else if ($years < 0) {
    	echo "Age can't be negative";
    } else {
    	echo "Please fill in your name or email correctly.";
    }
}
?>