HashCode.ru — 245206

     <?php
        if ( $_SERVER["QUERY_STRING"] ) :
            if ( !isset($_GET['email']) )
            {
                //mark input#email as incorrect
            } elseif ( !(isset($_GET['pswrd1']) && isset($_GET['pswrd2'])) )
            {
                //mark both password input as incorrect
            } elseif ( $_GET['pswrd1'] !== $_GET['pswrd2'] )
            {
                //mark both password input as incorrect
            } else
            {
                die("Registered successfully‎!");
            }
        endif;
    ?>
    <!DOCTYPE html>
    <html>
      <head>
        <title>Example of non-captcha protection</title>
        <script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>
        <script>
        var realURL="example.php/?"; //Just replace at needful
        $(function() {
            $("button#doReg").on("click", function() {
                var params = "email=" + $("input#email").val();
                params += "&pswrd1=" + $("input#pswrd1").val();
                params += "&pswrd2=" + $("input#pswrd2").val();
                params += "&bday=" + $("input#bday").val();

                $(location).attr('href',realURL + params);
            });
        });
        </script>
      </head>
      <body>
        <form action="registration.php" method="GET">  <!--FAKE URL-->
            <fieldset>
                <legend>Registration:</legend>
                Email: <input type="email" name="email" id="email" required maxlength="256"><br>
                Password: <input type="password" name="pswrd1" id="pswrd1" required maxlength="32"><br>
                Password confirm: <input type="password" name="pswrd2" id="pswrd2" required maxlength="32"><br>
                Birthday: <input type="date" name="bday" id="bday"><br>
                <input type="submit" style="display: none;" name="submit" value="ok">
                <button type="button" id="doReg">Register!</button>
            </fieldset>
        </form>
      </body>
    </html>