PHP SQLSRV export to Excel - php

Question

I am using PHP with SQLSRV in an attempt to export a table to Excel. I used this method with MySQLi with no problem.
Regardless, here is the code I am using to export to Excel:
<?php
include("../include/database.php");
global $ts;
$ts = date('mdY-His');
session_start();
$sql = "SELECT
[BOL_DATE]
,[BOOKING_NUM]
,[BOL_NUM]
,[VOYAGE]
....
FROM DETAIL
WHERE
// bunch of other stuff not necessary to show";
header("Content-Type: application/xls");
header("Content-Disposition: attachment; filename=fulldetails-".$ts.".xls");
header("Pragma: no-cache");
header("Expires: 0");
header("Content-Transfer-Encoding: binary ");
$sep = "\t"; //tabbed character
if($result = $dbc->sqlsrv_query($sql)) // <- error is here
{
while( $finfo = sqlsrv_fetch_array($sql, SQLSRV_FETCH_ASSOC) )
{
printf($finfo->name . $sep);
}
}
print("\n");
while( $finfo = sqlsrv_fetch_array($sql, SQLSRV_FETCH_ASSOC) )
{
$schema_insert = "";
for($j = 0; $j < sqlsrv_num_fields($result); $j++)
{
if(!isset($row[$j]))
$schema_insert .= "NULL".$sep;
elseif ($row[$j] != "")
$schema_insert .= "$row[$j]".$sep;
else
$schema_insert .= "".$sep;
}
$schema_insert = str_replace($sep."$", "", $schema_insert);
$schema_insert = preg_replace("/\r\n|\n\r|\n|\r/", " ", $schema_insert);
$schema_insert .= "\t";
print(trim($schema_insert));
print "\n";
}
?>
The error I am getting upon firing this process, the Excel sheet shows this error:
Fatal error: Call to a member function sqlsrv_query() on a non-object in C:\server\htdocs\main\reports\reports.php
Which is pointing to the part above where I labeled "error is here".
On the line above where I pointed the error out, I even changed it to this:
if($result = sqlsrv_query($dbc, $update))
But when the results are exported, the excel sheet is blank.
How can I edit my code to make this work?