Nella furia avevo fatto un erroraccio 
Codice PHP:
<?php
$output='';
$form= <<<EOD
<form action="?action=new_item" method="post" name="frm">
<input name="check_from" type="hidden" value="<?php echo time();?>" />
<input name="title" type="text" maxlength="50" />
<textarea name="description" cols="30" rows="30"></textarea>
<input name="save_item" type="submit" value="Save" />
</form>
EOD;
function redirect($page){
$host= $_SERVER['HTTP_HOST'];
$uri= rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
$extra= $page;
header("Location: VEDI SOPRA");
exit();
}
function refresh($page,$time=3){
$extra= $page;
header("Refresh: $time; URL=\"$extra\"");
}
function getPost($key){
return isset($_POST[$key]) ? $_POST[$key] : null;
}
function getGet($key){
return isset($_GET[$key]) ? $_GET[$key] : null;
}
function formHasPropriety(){
$hasProperty= true;
$args= func_get_args();
foreach($args as $arg){
if(is_null(getPost($arg))){
$hasProperty= false;
}
}
return $hasProperty;
}
if (is_null($action=getGet('action'))){
$action= 'form';
}
if ($action=='form')
{
$output= $form;
}
elseif($action=='new_item')
{
if(formHasPropriety('check_from','title','description','save_item')){
//validation
//input filter ie strip_tags
redirect('index.php');
}
else{
redirect('404.php');
}
}
else{
redirect('404.php');
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
*{
margin:0px;
padding:0px
}
input,textarea{
width:150px
}
textarea{
height:150px
}
</style>
</head>
<body>
<?php
echo $output;
?>
</body>
</html>
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