why it give me error ? filesonic API download

[Lifetalk]

WHOAAAAAAAAAAAAAAAAAAA! That is some really fucked up code. Use this instead:

<?php

$username = "";
$password = "";
$link = "";

//STOP, U NO EDIT BELOW!
$link = trim($link);
$id = explode('/', $link);
$id = trim($id[4]);

$page = file_get_contents("http://api.filesonic.com/link?method=getDownloadLink&u=$username&p=$password&ids=$id&format=json");
$page = json_decode($page, TRUE);

$finallink = trim($page['FSApi_Link']['getDownloadLink']['response']['links'][$id]['url']);

echo $finallink;

//PROFIT!
?>