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(PHP 4 >= 4.3.0, PHP 5, PHP 7)
fdf_get_encoding — Get the value of the /Encoding key
$fdf_document 
   )Gets the value of the /Encoding key.
fdf_document The FDF document handle, returned by fdf_create() , fdf_open() or fdf_open_string() .
Returns the encoding as a string. An empty string is returned if the default PDFDocEncoding/Unicode scheme is used.