Redirecting from registration page to login page on HTML

  html, php

I’m new to PHP and html coding. I’m making a simple login and registration form backed up by my database.

I want my registration page to redirect to my login page once a user registration is successful.

User hits Register-> if successful, "successfully registered" will be shown on the same page -> redirects to Login page.

But in my php coding for the registration page, I included "if" statements to show error messages for every field (for the case if user didnt fill it).

So, even when I include the header(‘location: login.php’) command, it does not redirect to my login page.
Instead, I enter a new page and the error message "Full name should not be empty" pops up. I dont know what I’m doing wrong. Please help.

Here’s my code for the registration page. Just to clarify, my registration page has 8 fields to be keyed by user, in which 6 of them are ‘required’. The required fields are from Full name to Confirm Password.

On the sidenote, I am trying to include error messages to pop up for every field. Eg; "Username should not be empty" and "passwords do not match". How can I implement that?

<?php
header('location:login.php');
error_reporting (E_ALL ^ E_NOTICE);

$fullname = filter_input(INPUT_POST, 'fullname');
$username = filter_input(INPUT_POST, 'username');
$email = filter_input(INPUT_POST, 'email');
$contactnum = filter_input(INPUT_POST, 'contactnum');
$password = filter_input(INPUT_POST, 'password');
$conpass = filter_input(INPUT_POST, 'conpass');
$expertise = filter_input(INPUT_POST, 'expertise');
$description= filter_input(INPUT_POST, 'description');

if(!empty($fullname))
{
    if(!empty($username))
    {
        if(!empty($email))
        {
            if(!empty($contactnum))
            {                                                           
                if(!empty($password))                                   
                {
                    $host = "localhost";
                    $dbusername = "root";
                    $dbpassword = "";
                    $dbname = "searchexperts";
                    
                    $conn= new mysqli ($host,$dbusername,$dbpassword,$dbname);
                    if(mysqli_connect_error())
                            {
                            die('Connection Error ('.mysqli_errno().')'.mysqli_connect_error());
                            }
                            else
                            {
                            $sql = "INSERT INTO newregister(Fullname,Username,Email,Contactnumber,Password,Expertise,Description) VALUE('$fullname','$username','$email','$contactnum','$password','$expertise','$description')";
                               if($conn->query($sql))
                                {
        
                                 echo " Successfully Registered!";
                                }
                                else
                                {
                                 echo "Error :".$sql."<br>".$conn->error;
                                }
                                $conn->close;
                            }
                }                                                       
                else
                {
                echo "Password should not be empty";
                
                }                                                   
                
                    
                                                    
                                                                         
                                                                        
                                                    
                                                                        
                                                                          
            }
            else
            {
            echo "Contact number should not be empty";
            
            }
 
        }
        else
        {
         echo "Email should not be empty";
         
        }
    }   
    else
    {
    echo "Username should not be empty";
    
    }
}
else
{
echo "Full name should not be empty";

}


?>

Source: Ask PHP

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