# fdf_open

(PHP 4, PHP 5, PHP 7)

fdf_open — Open a FDF document

### 说明

fdf_open ( string `$filename` ) : resource

Opens a file with form data.

You can also use fdf_open_string() to process the results of a PDF form POST request.

### 参数

`filename`

  Path to the FDF file. This file must contain the data as returned from a PDF form or created using fdf_create() and fdf_save().

### 返回值

Returns a FDF document handle, or `FALSE` on error.

### 范例

Example #1 Accessing the form data

    <?php
    // Save the FDF data into a temp file
    $fdffp = fopen("test.fdf", "w");
    fwrite($fdffp, $HTTP_FDF_DATA, strlen($HTTP_FDF_DATA));
    fclose($fdffp);

    // Open temp file and evaluate data
    $fdf = fdf_open("test.fdf");
    /* ... */
    fdf_close($fdf);
    ?>

### 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