PHP怎么将查询结束导出Excel

PHP如何将查询结束导出Excel

用户编号：" />
用户名：" />

if(!empty($_POST["u_num"])){
$u_num = "where u_id='"."{$_POST['u_num']}"."'";
}

$sql = "select * from msd.dbo.user";

$query = sqlsrv_query($conn,$sql);
if( $query === false) {
die( print_r( sqlsrv_errors(), true) );
}

while($row = sqlsrv_fetch_array($query)) {
echo "";
}

sqlsrv_free_stmt( $query);
sqlsrv_close( $conn);
?>

用户编号	用户名
$row[0]	$row[1]