(PHP 4, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_set_ap — Set the appearance of a field
fdf_set_ap ( resource $fdf_document , string $field_name , int $face , string $filename , int $page_number ) : bool
Sets the appearance of a field (i.e. the value of the /AP key).
fdf_document
The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
field_name
face
The possible values FDFNormalAP, FDFRolloverAP and FDFDownAP.
filename
page_number
Returns true on success or false on failure.
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https://www.php.net/manual/en/function.fdf-set-ap.php