选项正确时重定向链接

Question

I am trying to create some sort of hack challenge. My idea is based on modify the code. This is what I have so far:

<div class='info description'>
        Login as Ronald to complete the level
</div>

<div class='level-form'>
    <form method="POST" action="../Ronald.php">
        <fieldset>
            <label for="user">Username:</label>
            <select id="user" name="user">
                <option>John</option>
                <option>Petter</option>
                <option>David</option>
                <option>Sam</option>
            </select>
            <input type="submit" value="Submit" class="button">
        </fieldset>
    </form>           
</div>

I want to redirect to a next page, only after they modify one option to Ronald.

What do I need to put in the PHP file?

Answer 1

Tested and working!

Just change the http://yourdomain.com/successPage.php to the url you require. In order to pass test, change value of any options to Ronald, select that option and submit.

<?php
if (isset($_POST['user'])) {

if ($_POST['user'] == "Ronald") {
    print "You did it... Moving on <meta http-equiv='refresh' content='2;url=http://yourdomain.com/successPage.php'>";

} else {
    print "Sorry... Try again <meta http-equiv='refresh' content='2;url=".htmlspecialchars($_SERVER["PHP_SELF"])."'>";

}

} else { 
?>

<div class='info description'>
        Login as Ronald to complete the level
</div>

<div class='level-form'>
<form method="POST" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
    <fieldset>
        <label for="user">Username:</label>
        <select id="user" name="user">
            <option value="John">John</option>
            <option value="Petter">Petter</option>
            <option value="David">David</option>
            <option value="Sam">Sam</option>
        </select>
        <input type="submit" value="Submit" class="button">
    </fieldset>
</form>           
</div>

<?php } ?>