if ($_GET['ds']) {
if (isset($_GET['filename']) && isset($_GET["owner"])) {
$song = new Song();
$song->download();
}
} else {
if ($_GET['csmd']) {
if (isset($_GET['sid']) && (isset($_POST['name']) || isset($_POST['artist']) || isset($_POST['year']) || isset($_POST['album']) || isset($_POST['genre']) || isset($_POST['lyrics']))) {
$song = new Song();
$song->changemetadata();
}
} else {
if ($_GET['rs']) {
if (isset($_GET['sid']) && isset($_GET['uid'])) {
$song = new Song();
$song->removeSong();
}
} else {
if ($_GET['sus']) {
if (isset($_GET['uid'])) {
$song = new Song();
$song->showUserSongs();
}
} else {
if ($_GET['sch']) {
if (isset($_GET['uid']) && isset($_POST['val'])) {
$song = new Song();
$song->showUserSongs();
}
} else {
if ($_GET['e']) {