# fdf_get_ap

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

fdf_get_ap — Get the appearance of a field

### 说明

fdf_get_ap ( resource `$fdf_document` , string `$field` , int `$face` , string `$filename` ) : bool

Gets the appearance of a `field` (i.e. the value of the /AP key) and stores it in a file.

### 参数

`fdf_document`

  The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().

`field`

`face`

  The possible values are `FDFNormalAP`, `FDFRolloverAP` and `FDFDownAP`.

`filename`

  The appearance will be stored in this parameter.

### 返回值

成功时返回 `TRUE`， 或者在失败时返回 `FALSE`。