<?php
$url = $_POST["rssURL"];
if ($url != ""){
    $monRSSDoc = new DOMDocument();
    if ($monRSSDoc->load($url)){
        header('Content-Type: text/xml');
        echo $monRSSDoc->saveXML();
    } else {
        echo "erreur de lecture";
    }
} else {
    echo "URL vide";
}

?>