fdf_set_opt

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

fdf_set_opt — Sets an option of a field

fdf_set_opt ( resource $fdf_document , string $fieldname , int $element , string $str1 , string $str2 ) : bool

Sets options 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.
element
str1
str2

成功时返回 TRUE，或者在失败时返回 FALSE。