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(PHP 4, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_save — Save a FDF document
$fdf_document, string $filename = ?): bool
Saves a FDF document.
fdf_document
The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
filename
If provided, the resulting FDF will be written in this parameter. Otherwise, this function will write the FDF to the default PHP output stream.
成功时返回 true， 或者在失败时返回 false。
