Codice 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>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Documento senza titolo</title>
</head>
<body>
<form id="form1" name="form1" method="post" action="">
<select name="lista[]" size="3" multiple="multiple" id="lista[]">
<option value="valore" selected="selected">Voce</option>
<option value="valore2">Voce2</option>
</select>
<input type="submit" name="Submit" value="Invia" />
</form>
<?php
if(isset($_POST['lista'])){
foreach($_POST['lista'] as $val){
echo $val.'
';
}
}
?>
</body>
</html>