If you want to save the data to the Excel file.. you must store it first in database, then display your database in php with this header:
<?php
// excel raw data
header("Content-type: application/vnd-ms-excel");
// define the name "results.xls"
header("Content-Disposition: attachment; filename=results.xls");
// echo your database
include 'database.php';
?>
that is the simplest way for begginer... let me know if this work for you...