สอบถามผู้รู้ภาษา PHP เกี่ยวกับการใช้ค่า $_POST ใน Netฺbeans

<?php include './header.php';?>
<section>
<div>
<div>
<div class="col-sm-4">
					<div class="signup-form"><!--sign up form-->
						<h2>New User Sign Up</h2>
                                                <form method="POST" action="register_process.php">
                                                    <input type="text" name="re[username]"required="required" placeholder="Username"/>
                                                    <input type="password" name="re[password]" required="required" placeholder="Password"/>
                                                    <input type="text" name="re[first_name]" required="required" placeholder="First Name"/>
                                                    <input type="text" name="re[last_name]" required="required" placeholder="Last Name"/>
                                                    <input type="text" name="re[email]" required="required" placeholder="E-mail"/>
                                                    <textarea cols="100" rows="5" name="re[address]" required="required" placeholder="Address"></textarea> 
                                                    <button type="submit" class="btn btn-default">Sign Up</button>
						</form>
					</div><!--/sign up form-->
				</div>
			</div>
		</div>
	</section><!--/form-->


<?php include './footer.php';?>

<?php 
include './connection.php';
$myre = $_POST['re'];


if(!empty($myre['username']) &&
        
        !empty($myre['passwordl']) &&
        !empty($myre['first_name']) &&
        !empty($myre['last_name']) &&
        !empty($myre['email']) &&
        !empty($myre['address'])
        
        ){
    $sql = "INSERT INTO users(username,password,user_level)
            VALUES('".$myre['username']."',
                '".md5($myre['password'])."',
                    'member')";
    
    $result = mysql_query($sql) or die("Can not Register");
    if($result){
        $sql2 = "INSERT INTO user_details(user_id,first_name,last_name,email,address,created)
            VALUES('".mysql_insert_id()."',
                '".$myre['first_name']."',
                '".$myre['last_name']."',
                '".$myre['email']."',
                '".$myre['address']."',
                '".date("Y-m-d H:i:s")."')";
         $result2 = mysql_query($sql2);
             if($result2){
               echo "Register Complete < a href='index.php'>Back to Index Page </a>";  
             }else{
               echo "Can not Register Because, Failure to Register < a href='index.php'>Back to Register Page </a>";  
             }
        }
    }else{
        echo "Can not Register Because, You are Register Fill in Missing < a href='index.php'>Back to Register Page</a>";
    }

?>