# fdf_next_field_name

(PHP 4, PHP 5, PHP 7)

fdf_next_field_name — Get the next field name

### 说明

fdf_next_field_name ( resource `$fdf_document` [, string `$fieldname` ] ) : string

Gets the name of the field after the given field. This name can be used with several functions.

### 参数

`fdf_document`

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

`fieldname`

  Name of the FDF field, as a string. If not given, the first field will be assumed.

### 返回值

Returns the field name as a string.

### 范例

Example #1 Detecting all fieldnames in a FDF

    <?php
    $fdf = fdf_open($HTTP_FDF_DATA);
    for ($field = fdf_next_field_name($fdf);
        $field != "";
        $field = fdf_next_field_name($fdf, $field)) {
        echo "field: $field\n";
    }
    ?>

### 参见

- fdf_get_value() - Get the value of a field