(PHP 4 >= 4.0.2, PHP 5 < 5.3.0, PECL fdf SVN)
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_documentThe FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
fieldnameName of the FDF field, as a string.
elementstr1str2
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https://www.php.net/manual/en/function.fdf-set-opt.php