<?php
//Ricevo le variabili dal form
$post_url=$_POST['url'];
$post_link=$_POST['link'];
$post_info=$_POST['info'];
//Carico il file da modificare
$xml_file = simplexml_load_file("portfolio.xml");
//Creo i nuovi nodi
$work = $xml_file->addChild('work');
$work->addAttribute('url','PROVA');
$url = $work->addChild('url',$post_url);
$link = $work->addChild('link',$post_link);
$info = $work->addChild('info',$post_info);
//Stampo a video le modifiche
echo "<pre>".htmlentities($xml_file->asXML())."</pre>";
//VORREI INDENTARLO IN MODO CORRETTO !
//Aggiorno il file
$file = fopen("portfolio.xml","w");
fwrite($file, $xml_file->asXML());
fclose($file);
?>