HTML to PDF with PHP and wkhtmltopdf

example.php

<?php

/******
I was using tcpdf then mpdf for years, and then I discovered wkhtmltopdf and it changed my life.
If you can exec() then you will enjoy super fast operation, no more memory/process time outs, 
and overall easier and better PDFs... Check out http://wkhtmltopdf.org/ ... binaries for most platforms.
******/

//Setup file parameters
$cwd = getcwd();
$htmlfile = $cwd.DIRECTORY_SEPARATOR.'tmp'.DIRECTORY_SEPARATOR.date('Y-m-d-h-m-s').'.html';
$pdffile = $cwd.DIRECTORY_SEPARATOR.'tmp'.DIRECTORY_SEPARATOR.date('Y-m-d-h-m-s').'.pdf';

//Fat Free Framework code that generates a valid html file and writes to disk       
$html = \Template::instance()->render('pdf/order.html');
$f3->write($htmlfile, $html);

//Convert HTML to PDF 
exec('"C:\Program Files\wkhtmltopdf\bin\wkhtmltopdf.exe" '.$htmlfile.' '.$pdffile);

//Output the file to browser           
header('Content-Type: application/pdf');
header('Content-Length: ' . filesize($pdffile));
readfile($pdffile);

//Delete the junk and bye!   
unlink($htmlfile);
unlink($pdffile);