export file from table to excel using php

Question

hi im a newbie in programming and im using php. below is my code for .xls. i have one form where i have three buttons the add search and "save to excel". and also i have a table where my output for add button will be shown and that was connected to my database. now my problem is when i click the button "save to excel", the whole data in my form appear to the excel. what i want is that the table in my form will be only save in my excel. not the whole data in my form. if i can only post the image here you probably might understand me clearly. :( . but please i need some help. :( .. thanks

if (isset($_POST['download']))
{
$file="document_name" . date('Ymd') . ".xls";

header("Content-type: application/vnd.ms-excel");// file extension name
header("Content-Disposition: attachment; filename=$file");

}

Answer 1

header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");;
header("Content-Disposition: attachment;filename=line_utilization_report.xls ");
header("Content-Transfer-Encoding: binary ");