file1:
<?php
if (isset($_POST['submitted'])) {
session_start();
echo "happy?";
echo $_SESSION['info'][$_SESSION['crtnr']];
}else{
session_start();
$_SESSION['crtnr']=1;
$_SESSION['info'][$_SESSION['crtnr']]='hi there';
}
include ('file2.html');
?>
file2:
<form action='file1.php' method="post">
<input name="info" value="<?php echo $_SESSION['info'][$_SESSION['crtnr']]; ?>" type="text" size='20'/>
<input type="hidden" name="submitted" value="1">
<p><input type="submit" value="Send" /></p>
</form>

I thought it would write the session twice, the second time (once in the input box and once out, but it doesn't write it at all.
I'm in php5.3 by the way.