This extension is considered unmaintained and dead.
However, the source code for this extension is still available
SVN here: » https://svn.php.net/viewvc/pecl/fdf.
This extension is no longer bundled with PHP as of
Note: If you
run into problems configuring PHP with fdftk support, check whether
the header file fdftk.h and the library
libfdftk.so are at the right place. The
configure script supports both the
directory structure of the FDF SDK distribution and the usual
DIR/include / DIR/lib layout, so you can point it either
directly to the unpacked distribution directory or put the header
file and the appropriate library for your platform into e.g.
/usr/local/include and /usr/local/lib and configure with –with-fdftk=/usr/local .
Note: Note to Win32
In order for this extension to work, there are
DLL files that must
be available to the Windows system PATH.
For information on how to do this, see the FAQ entitled “How
do I add my PHP directory to the PATH on Windows“. Although
copying DLL files from the PHP folder into the Windows system
directory also works (because the system directory is by default in
the system’s PATH), this is not
recommended. This extension requires the
following files to be in the PATH: