Returns the FDF document as a string

# fdf_save_string

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

fdf_save_string — Returns the FDF document as a string

### 说明

function fdf_save_string(resource `$fdf_document`): string

Returns the FDF document as a string.

### 参数

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

### 返回值

Returns the document as a string, or `false` on error.

### 示例

示例 #1 Retrieving FDF as a string

    <?php
    $fdf = fdf_create();
    fdf_set_value($fdf, "foo", "bar");
    $str = fdf_save_string($fdf);
    fdf_close($fdf);
    echo $str;
    ?>

以上示例会输出：

    %FDF-1.2
    %âãÏÓ
    1 0 obj
    <<
    /FDF << /Fields 2 0 R >>
    >>
    endobj
    2 0 obj
    [
    << /T (foo)/V (bar)>>
    ]
    endobj
    trailer
    <<
    /Root 1 0 R

    >>
    %%EOF

### 参见

- fdf_open_string() - Read a FDF document from a string
- fdf_close() - Close an FDF document
- fdf_create() - Create a new FDF document
- fdf_save() - Save a FDF document

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