fejl i explode

Nogen der kan se hvad der går galt siden jeg ikke får pris og url?

$lines    = file('http://www.biblio.com/affiliate_search.php?aid=booksforlife&isbn=0553260219');
foreach ($lines as $line_num => $line) {
$temp = array();
$pieces = explode("\t", $line);
$temp['Authors'] = $pieces[0];
$temp['Titel'] = $pieces[1];
$temp['Description'] = $pieces[2];
$temp['ISBN'] = $pieces[3];
$temp['Publisher'] = $pieces[4];
$temp['Price'] = $pieces[5];
$temp['Url'] = $pieces[6];
  $output = $temp;
  }
print_r ($output);