fdf_set_flags

(PHP 4 >= 4.0.2, PHP 5, PHP 7)

fdf_set_flags — Sets a flag of a field

fdf_set_flags ( resource $fdf_document , string $fieldname , int $whichFlags , int $newFlags ) : bool

Sets certain flags of the given field.

fdf_document: The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
fieldname: Name of the FDF field, as a string.
whichFlags
newFlags

成功时返回 TRUE，或者在失败时返回 FALSE。