(PHP 4 >= 4.0.2, PHP 5 < 5.3.0, PECL fdf SVN)
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
Returns true on success or false on failure.
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https://www.php.net/manual/en/function.fdf-set-flags.php