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(PHP 4 >= 4.3.0, PHP 5, PHP 7)
fdf_set_target_frame — Set target frame for form display
$fdf_document 
   ,  string $frame_name 
   )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.
   成功时返回  TRUE , 或者在失败时返回  FALSE 。