The PDFTK PHP Library requires a valid installation of the PDFTK Binary, which can be found:
http://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/
The library is PSR-0 compliant and the simplest way to install it is via composer, at the moment it isn't part of the main composer package library so it can be included by putting:
{
"repositories": [
{
"type": "vcs",
"url": "https://github.com/bensquire/php-pdftk-toolkit"
}
],
"require": {
"bensquire/php-pdftk-toolkit": "development"
}
}
into your composer.json, then run 'composer install' or 'composer update' as required.