安裝
此擴充套件被認為已無人維護及已消亡。然而，此擴充套件的原始碼還可在 PECL SVN 找到： » https://svn.php.net/viewvc/pecl/fdf.
This extension is no longer bundled with PHP.
注意: 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.
注意: Note to Win32 Users
爲了使此擴充套件生效， DLL 檔案必須能在 Windows 系統的 PATH 指示的路徑下找到。如何操作的資訊，請參見題為「如何在 Windows 中將 PHP 目錄加到 PATH 中」的FAQ。雖然將 DLL 檔案從 PHP 資料夾複製到 Windows 系統目錄也行，但不建議這樣做。 此擴充套件需要下列檔案在 PATH 路徑中： fdftk.dll