Make Report PDF using libreoffice in PHP

<?php
$config_libreoffice_path='C:\\Program Files (x86)\\LibreOffice 5\\program\\soffice.exe';
$config_temp_dir='C:\\temp';
$fname='surat';

header('Expires: Tue, 1 Jan 2019 00:00:00 GMT');
header('Cache-Control: no-cache');
header('Pragma: no-cache');
header('Content-Disposition: attachment; filename="'.$fname.'.pdf"');
header('Content-Type: application/pdf');

$field=array('{KEPADA}', '{TEMPAT}', '{PEJABAT}');
$replace=array('Budi', 'Jakarta', 'Amir');

//$template=file_get_contents('C:\xampp\htdocs\cetak\surat.xml');
//file_put_contents($config_temp_dir.'\\'.$fname.'.xml', str_replace($field, $replace, $template));

exec('"'.$config_libreoffice_path.'" --headless --convert-to pdf:writer_pdf_Export --outdir "'.$config_temp_dir.'" "'.$config_temp_dir.'\\'.$fname.'.xml"');
readfile($config_temp_dir.'\\'.$fname.'.pdf');

/*
xls :
header('Content-Disposition: attachment; filename="'.$fname.'.xls"');
header('Content-Type: application/vnd.ms-excel');
exec('"'.$config_libreoffice_path.'" -headless -convert-to xls:"MS Excel 97" -outdir "'.$config_temp_dir.'" "'.$config_temp_dir.'\\'.$fname.'.xml"');
readfile($config_temp_dir.'\\'.$fname.'.xls');
doc :
header('Content-Disposition: attachment; filename="'.$fname.'.doc"');
header('Content-Type: application/vnd.ms-word');
exec('"'.$config_libreoffice_path.'" -headless -convert-to doc:"MS Word 97" -outdir "'.$config_temp_dir.'" "'.$config_temp_dir.'\\'.$fname.'.xml"');
readfile($config_temp_dir.'\\'.$fname.'.doc');
*/
?>