title: Concatenating PDFs in PHP
body: <p>I've got a grip of PDFs that I need to combine into one using PHP. Googling around gives me very little that seems like a reasonable solution. The best thing I can find is to use <a href="http://us.php.net/manual/en/function.exec.php" rel="nofollow noreferrer">exec()</a> and <a href="http://www.accesspdf.com/pdftk/" rel="nofollow noreferrer">pdftk</a> but that's just ugly. Does anyone know of a more elegant solution that doesn't involve me shelling out all the money on the planet for some non-free lib?</p>