(PHP 4 >= 4.3.0, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_set_target_frame — Set target frame for form display
fdf_set_target_frame ( resource $fdf_document , string $frame_name ) : bool
Sets the target frame to display a result PDF defined with fdf_save_file() in.
fdf_document
The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
frame_name
The frame name, as a string.
Returns true
on success or false
on failure.
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https://www.php.net/manual/en/function.fdf-set-target-frame.php