I´ve tried a lot of times running the following Code, but, even 
working well, always leaves the same error ( error message 
appears at the same time I open the PHP Code ) =

```
" 
Notice: Undefined index: enviar in 
C:\wamp\www\290.php on  line 2 "

```

( The only thing that I've tried was " try to justify the polemic code 
line 2 " - see line 3 - changing the 2nd line and introduce the 
Code of the 3rd line and all I´ve got is make dissapear the error 
message, but .... ¡ the code accepts the data input but don't 
show anything in the screen ! )  

Here's the Code ( some HTML lines ) - File name = " get.php " -

```
<?php
if ($_GET['enviar']) {
#  if (isset($_GET['enviar']) && $_GET['enviar'] == '1') { 
    echo $_GET['nombre'];
} else {
    ?>
    <form action='get.php' method='get'>
        <p>
            Escribe tu nombre:  <input name='nombre'  type='text'  />
        </p>
        <p>
            <input name='enviar'  value='Enviar datos'  type='submit'  />´
        </p>
    </form>
    <?php
}
?>

```