within my login code (index.php) there is a section for facebook login. it checks whether or not the user has been logged in. now i can't use headers to redirect the user to a different page because it produces the error

> 
> 
> ```
> Warning: Cannot modify header information - headers already sent by
> 
> ```
> 
> (output started at
>  C:\xampp\htdocs\kite\index.php:81) in
>  C:\xampp\htdocs\kite\index.php on line
>  196
> 
> 
> 

so as a result i've resorted to using to meta-refresh

```
    <?php 
                //if user is logged in already
                if ($user): ?>
                <?php 
                //redirect them to the user sonline page
echo '<META HTTP-EQUIV="Refresh" Content="1; URL=main.php">'; 
                //if user is not logged in
                else: ?>
                <input name="fblogin" type="button" value="Login with Facebook" class="fblogin" onclick="location.href='<?php echo $loginUrl; ?>'"/>
                <?php endif ?>

```

what are the advantages and disadvantages of this method?

thanking you in advance

---

all i have on line 81 is

```
<?php // include the hashing class  
require ("resources/phpass/PasswordHash.php"); 

```