Get the appearance of a field

# fdf_get_ap

(PHP 4 >= 4.3.0, PHP 5 < 5.3.0, PECL fdf SVN)

fdf_get_ap — Get the appearance of a field

### 说明

function 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`。

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