Export sql server Query Result in Excel file - php

Question

I have code to export mysql query result data into Excel. But Now I use SQL Server.I haven't idea to fetch number of fields name. I find many blogs but they all are display php function of mysql database. I need php function which usefull to get field name and number from SQL Query Result
$header = '';
$result = '';
$exportData = sqlsrv_query($gaSql['link'], $sQuery) or die("$sQuery: " . sqlsrv_errors());
$fields = mysql_num_fields($exportData);
for ($i = 0; $i < $fields; $i++) {
if (in_array(mysql_field_name($exportData, $i), $_POST['optFieldName'])) {
$header .= mysql_field_name($exportData, $i) . "\t";
}
// $header .= mysql_field_name($exportData, $i) . "\t";
}
//
$row = array();
for ($i = 0; $i < mysql_num_rows($exportData); $i++) {
$result_excel = mysql_fetch_array($exportData);
array_push($row, $result_excel);
}
foreach ($row as $rowvalue) {
$line = '';
for ($j = 0; $j < count($_POST['optFieldName']); $j++) {
$value = $rowvalue[$_POST['optFieldName'][$j]];
if ((!isset($value) ) || ( $value == "" )) {
$value = "\t";
} else {
$value = str_replace('"', '""', $value);
$value = '"' . $value . '"' . "\t";
}
$line .= $value;
}
$result .= trim($line) . "\n";
}
$result = str_replace("\r", "", $result);
if ($result == "") {
$result = "\nNo Record(s) Found!\n";
}
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=export.xls");
header("Pragma: no-cache");
header("Expires: 0");
print "$header\n$result";