checkbox和ineger变量不会向phpMyAdmin数据库发送任何数据

Question

I'm not sure if I actually have problem with checkbox form or age, height and weight which i put it in int as variable on phpMyAdmin. Because after I click signup, it just write error upside the form. So I really confuse where is my error

<?php

session_start();
if(isset($_SESSION['user'])!="")
{
    header("Location: home.php");
}
include_once 'dbconnect.php';

if(isset($_POST['signup']))
{
    $username = mysql_real_escape_string($_POST['username']);
    $email = mysql_real_escape_string($_POST['email']);
    $upass = md5(mysql_real_escape_string($_POST['password']));
    $age = $_POST['age'];
    $disease=$_POST['disease'];
    $weight = $_POST['weight'];
    $heigth = $_POST['height'];
    
    $dis=""; 
    $flag=0; 
    foreach($disease as $entry){ 
    $dis .= $entry."|"; 
    $flag=1; 
    } 
    if($flag==1){ 
    $dis=rtrim($dis); 
    } 

    // Insert data into mysql 
    $sql="INSERT INTO users(username,email,password, age, disease, weight, heigth) VALUES('$username','$email','$upass', '$age', '$dis', '$weight', '$heigth')";
    $result=mysql_query($sql); 

    // if successfully insert data into database, displays message "Successful". 
    if($result){ 
    echo "Successful"; 
    echo "<BR>"; 
    echo "<a href='P.SIGNUP.php'>Back to main page</a>"; 
    } 

    else { 
    echo "ERROR"; }
}
?>

<form name=register method="post" class="form-horizontal" role="form" onSubmit="return validatePwd()">
    <div class="form-group">
            <div class="form-group">
                <label for="disease" class="col-sm-2 control-label"></label>
                <div class="col-sm-10">
                    <h1>Register</h1>
                </div>
            </div>
            <div class="form-group">
                <label for="username" class="col-sm-2 control-label">Username</label>
                <div class="col-sm-10">
                    <input type="text" class="form-control" name="username" id="username" placeholder="User Name" class="required" />
                </div>
            </div>
            <div class="form-group">
                <label for="password" class="col-sm-2 control-label">Password</label>
                <div class="col-sm-10">
                    <input type="password" class="form-control" id="password" name="password" placeholder="6-12 character" />
                </div>
            </div>
            <div class="form-group">
                <label for="password" class="col-sm-2 control-label">Confirm Password</label>
                <div class="col-sm-10">
                    <input type="password" class="form-control" name="password2" placeholder="6-12 character" />
                </div>
            </div>
            <div class="form-group">
                <label for="email" class="col-sm-2 control-label">E-mail</label>
                <div class="col-sm-10">
                    <input type="email" class="form-control" name="email" placeholder="[e-mail]" class="email required" />
                </div>
            </div>
            <div class="form-group">
                <label for="age" class="col-sm-2 control-label">Age</label>
                <div class="col-sm-10">
                    <input type="number" name="age" min="45" max="55" step="1" value="45" />
                </div>
            </div>
            <div class="form-group">
                <label for="disease" class="col-sm-2 control-label">Disease</label>
                <div class="col-sm-10">
                    <input type="checkbox" name="disease[]" value="obesity" />Obesity<br/>
                    <input type="checkbox" name="disease[]" value="diabetes" />Diabetes<br/><br/>
                    <b>Cancer</b><br>
                    <input type="checkbox" name="disease[]" value="coloncancer" />Colon Cancer<br/>
                    <input type="checkbox" name="disease[]" value="kidneyCancer" />Kidney Cancer<br/>
                    <input type="checkbox" name="disease[]" value="breastCancer" />Breast Cancer<br/><br/>
                    <input type="checkbox" name="disease[]" value="cardio" />Cardio Disease<br/>
                </div>
            </div>
        <div class="form-group">
                <label for="weight" class="col-sm-2 control-label">Weight</label>
                <div class="col-sm-10">
                    <input type="number" name="weight" min="30" max="180" step="10" />kg
                </div>
        </div>
        <div class="form-group">
                <label for="height" class="col-sm-2 control-label">Height</label>
                <div class="col-sm-10">
                    <input type="number" name="height" min="100" max="200" step="10" />cm
                </div>
        </div>
    </div>
        <div class="form-group">
                <label for="disease" class="col-sm-2 control-label"></label>
                <div class="col-sm-10">
                    <button type="submit" class="btn btn-primary" name="signup"> SIGNUP </button>
                </div>
        </div>
</form>

</div>