(PHP / HTML)网页文件未执行

I am creating a login and signup page. I am using MAMP server and Querious MySQL manager. The name of this code file is "SignUp.php" and I am going nuts for past fews days to find why isn't it executing on the localhost website. It shows blank screen when I run it from netbeans. This SignUp.php is a webpage template. I use netbeans to code this. Please help me how to get this running because I can run login-form as I code it in html file but this is .php file that contains html section too. I tried all the knowledge I could get but I do not know where I am going wrong. When I run this file, it shows blank page - no html section is displaying. Thank you very much for your help.

<html>
<head>
    <meta charset="UTF-8">
    <title>SignUp</title>
</head>
<body>
<form name=form3 action="SignUp.php" method="post">
        <table id ="title"> 
            <tr>
                <p><input id="First_Name" name="fname" type="text" placeholder="First Name"></p>
            </tr>
            <tr>
                <p><input id="Last_Name" name="lname" type="text" placeholder="Last Name"></p>
            </tr>
            <tr>
                <p><input id="Email_Id" name ="email" type="text" placeholder="Email-Id"></p>
            </tr>
            <tr>
                <p><input id="Username" name ="username" type="text" placeholder="Username"></p>
            </tr>
            <tr>
                <p><input id="Password" name ="password" type="password" placeholder="Password"></p>
            </tr>
            <tr>
                <p><input id="Confirm_Password" name ="cpassword" type="password" placeholder="Confirm Password"></p>
            </tr>
            <tr>
                <td>&nbsp;</td>
                <p><input type="submit" name="submit" value="Sign Up"
            </tr>
        </table>
    </div>
</form>

<?php
    include("DB_Connect.php");
    if (isset(filter_input(INPUT_POST,'submit')))
    {
        if(!filter_input(INPUT_POST,'fname') | !filter_input(INPUT_POST,'lname') | !filter_input(INPUT_POST,'email') | 
                !filter_input(INPUT_POST,'username') | !filter_input(INPUT_POST,'password') | !filter_input(INPUT_POST,'cpassword'))
        {
            die('You did not complete all of the required fields'); 
        }
    }

//check validation email
    $check = "SELECT Email_Id FROM Members where Email_Id='".$email."'";
    $result1 = mysql_query($connection,$query1);
    $numResults = mysql_num_rows($result1);
    if(!!filter_var($email, FILTER_VALIDATE_EMAIL))
    {
        $message =  "Invalid email address, please type valid email address";
    }
    elseif($numResult>=1)
    {
        $message = $email." Email already exist!!";
    }

//checks if the username is in use
    if (!get_magic_quotes_gpc())
    {
        filter_input(INPUT_POST,'username') = addslashes(filter_input(INPUT_POST,'username'));
    }
    $usercheck = filter_input(INPUT_POST,'username');
    $check1 = mysql_query("SELECT Username FROM Members WHERE Username = '$usercheck'");

// if the name given exist error
    $check2 = mysql_num_rows($check1);
    if ($check2 != 0)
    {
        die('Sorry, the Username '.  filter_input(INPUT_POST, 'username').' is already in use.');
    }

//if passwords match
    if (filter_input(INPUT_POST, 'password')!= filter_input(INPUT_POST, 'cpassword'));
    {
        die('Your passwords did not match. ');
    }

//encrypt password
    filter_input(INPUT_POST,'password') = md5(filter_input(INPUT_POST, 'password'));
    if (!get_magic_quotes_gpc())
    {
        filter_input(INPUT_POST, 'password') = addslashes(filter_input(INPUT_POST, 'password'));
        filter_input(INPUT_POST, 'username') = addslashes(filter_input(INPUT_POST, 'username'));
    }

//add member
    $insert = "INSERT INTO Members (First Name, Last Name, Email-Id, Username, Password, Confirm Password)
        VALUES ('".filter_input(INPUT_POST,'fname')."', '".filter_input(INPUT_POST,'lname')."',
                '".filter_input(INPUT_POST,'email')."', '".filter_input(INPUT_POST,'username')."',
                '".filter_input(INPUT_POST,'password')."','".filter_input(INPUT_POST,'cpassword')."')";
    $add_member = mysql_query($insert);

    ?>

<h1>Registered</h1>
    <p>Thank you, you have registered - you may now login</a>.</p>
    ?>
</body>