I have this working fine from Linux command line:
wkhtmltopdf entry.html output.pdf
But the following doesn't work from PHP code:
exec ('wkhtmltopdf entry.html output.pdf');
Interesting, I've googled and a lot of non-checked solutions and with no explanation why this is a problem. Thanks if you have the good ones.
wkhtmltopdf has bindings, one of them is for PHP. You could give those a shot.