'How to validate in session ? Keep getting undefined array

I tried to validate a form by making another page that's specifically for validating the user input. After done validating, it will take the user to another page to display the result. Main issue is I keep getting Undefined array key on specific attributes/ codes.

pbt1.php

<html>
<?php
session_start();
if(isset($_SESSION['pbt1']))
{
    $nameError      =   $_SESSION['pbt1']['nameError'];  
    $numberError    =   $_SESSION['pbt1']['numberError'];
    $addressError   =   $_SESSION['pbt1']['addressError'];
    $cityError      =   $_SESSION['pbt1']['cityError'];
}
?>

<style>
.registrationform 
{
    padding: 20px;
    margin: auto;
    margin-top: 20px;
    line-height: 30px;
    width: 600px;
    border: solid 3px red;   
}

Label
{
    width:200px;
    display:inline-block;
}

</style>
    <div class= "registrationform">

        <h1>ONLINE MARATHON REGISTRATION</h1>
        <br><br>

        <form name = "pbt1" method = "post" action = "validation.php">
        
        <Label>Name<span style="color: red;">*</span>: </Label>
        <input type = "text" name = "name">
        <span id = "warning" style="color: red;" > <?php echo isset($nameError) ?$nameError :'';?></span>
        <br><br>

        <Label>Gender <span style="color: red;">*</span>:</Label> 
        <input type = "radio" name = "gender" value = "Female">Female
        <input type = "radio" name = "gender" value = "Male">Male
        <span id = "warning" style="color: red;"><?php echo isset($genderError) ? $genderError :'';?></span>
        <br><br>

        <Label>Date Of Birth <span style="color: red;">*</span>:</Label> 
        <input type = "date" name = "date">
        <span id = "warning" style="color: red;"><?php echo isset($dateError) ? $dateError:'';?></span>
        <br><br>

        <Label>Contact Number <span style="color: red;">*</span>:</Label> 
        <input type = "text" name = "phonenumber">
        <span id = "warning" style="color: red;"><?php echo isset($numberError) ? $numberError:'';?></span>
        <br><br>

        <Label>Address <span style="color: red;">*</span>:</Label>
        <input type = "text" name = "address" >
        <span id = "warning" style="color: red;"><?php echo isset($addressError) ? $addressError :'';?></span>
        <br><br>

        <Label>City <span style="color: red;">*</span>:</Label> 
        <input type = "text" name = "city" >
        <span id = "warning" style="color: red;"><?php echo isset($cityError) ? $cityError:'';?></span>
        <br><br>

        <Label>Zip Code <span style="color: red;">*</span>:</Label> 
        <input type = "text" name = "zipcode" >
        <span id = "warning" style="color: red;"><?php echo isset($zipcodeError) ? $zipcodeError:'';?></span>
        <br><br>

        <div style="text-align:center;">
        <input type = "submit" value = "Submit" name="Submit">
        </div>
        </form>     
    </div>
    <br><br>
</html>

pbt2.php

<?php
session_start();
?>
<html>
<style>
    table 
{
    text-align:center;
}
</style>



<div style="background-color:cyan;">

<h1 align = 'center'> YOUR INFORMATION AS THE TABLE BELOW </h1>

<table width = '400' border = '1' align = 'center'>
    <tr>
        <td>Name</td>
        <td><?php echo $_SESSION['Userdata']['name'];?></td>
    </tr>
    <tr>
        <td>Phone Number</td>
        <td><?php echo $_SESSION['Userdata']['phonenumber'];?></td>
    </tr>
    <tr>
        <td>Address</td>
        <td><?php echo $_SESSION['Userdata']['address'];?></td>
    </tr>
    <tr>
        <td>City</td>
        <td><?php echo $_SESSION['Userdata']['city'];?></td>
    </tr>
    <tr>
        <td>Zip Code</td>
        <td><?php echo $_SESSION['Userdata']['zipcode'];?></td>
    </tr>
    <tr>
        <td>Gender</td>
        <td><?php echo $_SESSION['Userdata']['gender'];?></td>
    </tr>
    <tr>
        <td>Date</td>
        <td><?php echo $_SESSION['Userdata']['date'];?></td>
    </tr>
</table>

</div>
</html>

validation.php

<?php
session_start();

if(isset($_POST['Submit']))
{

    $name = $_POST['name'];
    if(isset($name) && empty($name))
    {
        $_SESSION['pbt1']['nameError']="Name must be required!";
        header('location: pbt1.php');  
        exit;
    }
    else
    {
        if(!preg_match("/^[a-zA-Z ]*$/",$name))
        {
            $_SESSION['pbt1']['nameError'] = "Only letters and white space allowed";
            header('location: pbt1.php');  
            exit;
        }   
    }

    $phonenumber = $_POST['phonenumber'];
    if(isset($phonenumber) && empty($phonenumber))
        {
            $_SESSION['pbt1']['numberError'] = "Error, insert phone number";
            header('location: pbt1.php');  
            exit;
        }
    else 
        {
            if(!preg_match('/^([0-9]*)$/', $phonenumber))
            {
                $_SESSION['pbt1']['numberError'] = "Numbers only";
                header('location: pbt1.php');  
                exit;
            }
        }

    $address = $_POST['address'];
    if(isset($address) && empty($address))
        {
            $_SESSION['pbt1']['addressError'] = "Enter your address";
            header('location: pbt1.php');  
            exit;
        }

    $city = $_POST['city'];
    if(isset($city) && empty($city))
    {
        $_SESSION['pbt1']['cityError']="Name must be required!";
        header('location: pbt1.php');  
        exit;
    }
    else
    {
        if(!preg_match("/^[a-zA-Z ]*$/",$city))
        {
            $_SESSION['pbt1']['cityError'] = "Only letters and white space allowed";
            header('location: pbt1.php');  
            exit;
        }   
    }

    $zipcode = $_POST['zipcode'];
    if(isset($zipcode) && empty($zipcode))
        {
            $_SESSION['pbt1']['zipcode'] = "Error, insert phone number";
            header('location: pbt1.php');  
            exit;
        }
    else 
        {
            if(!preg_match('/^([0-9]*)$/', $zipcode))
            {
                $_SESSION['pbt1']['zipcode'] = "Numbers only";
                header('location: pbt1.php');  
                exit;
            }
        }

    $gender = $_POST['gender'];
    if(isset($gender) && empty($gender))
    {
        $_SESSION['pbt1']['genderError'] = "Error, please select a gender";
        header('location: pbt1.php');  
        exit;
    }

    $date = $_POST['date'];


    $_SESSION['Userdata'] = ['name'=>$name , 'phonenumber'=>$phonenumber,'address'=>$address,'city'=>$city,
                            'zipcode'=>$zipcode,'gender'=>$gender,'date'=>$date ];

    header("location:pbt2.php");
    exit;
}
?>

Errors I got so far are : Warning: Undefined array key "dateError" pbt1.php on line 11

Warning: Undefined array key "addressError" pbt1.php on line 12

Warning: Undefined array key "cityError" pbt1.php on line 13

It's so weird that $nameError and numberError work just fine while the rest aren't.

phpsession


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Source: Stack Overflow

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