Answer by Oussama Ben Ghorbel for add RSS feed dynamically using php

I solved it my self here is the code below:

    $rssfeed = '<?xml version="1.0" encoding="ISO-8859-1"?>';    $rssfeed .= '<rss version="2.0">';    $rssfeed .= '<channel>';    $rssfeed .= '<title>My RSS feed</title>';    $rssfeed .= '<link>my link</link>';    $rssfeed .= '<description>something</description>';    $rssfeed .= '<language>en-us</language>';    $rssfeed .= '<copyright>Copyright (C) 2017</copyright>';    foreach ($list as $l) {        $rssfeed .= '<item>';        $rssfeed .= '<title>' . $l['titre'] . '</title>';        $rssfeed .= '<description>' . $l['contenu'] . '</description>';        $rssfeed .= '<link>' . "my link" . '</link>';        $rssfeed .= '<pubDate>' . date("D, d M Y H:i:s O", strtotime($l['date_de_creation'])) . '</pubDate>';        $rssfeed .= '</item>';    }    $rssfeed .= '</channel>';    $rssfeed .= '</rss>';    $handle = fopen("../rss.xml", "w+");    fclose($handle);    $myfile = fopen("../rss.xml", "w");    fwrite($myfile, $rssfeed);    fclose($myfile);