Generating Excel using PHP

require_once "excel.php";
$filename = "anyoneyoulike.xls";
$export_file = 'xlsfile:/tmp/'.$filename;
$fp = fopen($export_file, "wb");
if (!is_resource($fp))
{
die("Cannot open $export_file");
}
$assoc = array(
array("First name" => "Mattias", "IQ" => 250,
array("First name" => "Tony", "IQ" => 100,
array("First name" => "Peter", "IQ" => 100,
array("First name" => "Edvard", "IQ" => 100));
fwrite($fp, serialize($assoc));
fclose($fp);

header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header ("Last-Modified: " . gmdate("D,d M YH:i:s") . " GMT");
header ("Cache-Control: no-cache, must-revalidate");
header ("Pragma: no-cache");
header ("Content-type: application/x-msexcel");
header ("Content-Disposition: attachment; filename=\"" . $filename . "\"" );
header ("Content-Description: PHP/INTERBASE Generated Data" );
readfile($export_file);
exit;