(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_documentThe FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
field_nameface The possible values FDFNormalAP, FDFRolloverAP and FDFDownAP.
filenamepage_number
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https://www.php.net/manual/en/function.fdf-set-ap.php