Forms Data Format Functions
Introdução
Forms Data Format (FDF) is a format for handling forms within PDF documents. You should read the documentation at » https://partners.adobe.com/asn/acrobat/forms.jsp for more information on what FDF is and how it is used in general.
The general idea of FDF is similar to HTML forms. The difference is basically the format how data is transmitted to the server when the submit button is pressed (this is actually the Form Data Format) and the format of the form itself (which is the Portable Document Format, PDF). Processing the FDF data is one of the features provided by the fdf functions. But there is more. One may as well take an existing PDF form and populated the input fields with data without modifying the form itself. In such a case one would create a FDF document (fdf_create()) set the values of each input field (fdf_set_value()) and associate it with a PDF form (fdf_set_file()). Finally it has to be sent to the browser with MimeType application/vnd.fdf. The Acrobat reader plugin of your browser recognizes the MimeType, reads the associated PDF form and fills in the data from the FDF document.
If you look at an FDF-document with a text editor you will find a catalogue object with the name FDF. Such an object may contain a number of entries like Fields, F, Status etc.. The most commonly used entries are Fields which points to a list of input fields, and F which contains the filename of the PDF-document this data belongs to. Those entries are referred to in the FDF documentation as /F-Key or /Status-Key. Modifying this entries is done by functions like fdf_set_file() and fdf_set_status(). Fields are modified with fdf_set_value(), fdf_set_opt() etc..
Dependências
You need the FDF toolkit SDK available from » https://partners.adobe.com/asn/acrobat/forms.jsp. As of PHP 4.3.0 you need at least SDK version 5.0. The FDF toolkit library is available in binary form only, platforms supported by Adobe are Win32, Linux, Solaris and AIX.
Instalação
You must compile PHP with --with-fdftk[=DIR].
Nota: If you run into problems configuring PHP with fdftk support, check whether the header file fdftk.h and the library libfdftk.so are at the right place. The configure script supports both the directory structure of the FDF SDK distribution and the usual DIR/include / DIR/lib layout, so you can point it either directly to the unpacked distribution directory or put the header file and the appropriate library for your platform into e.g. /usr/local/include and /usr/local/lib and configure with --with-fdftk=/usr/local.
Nota: Note to Win32 Users Para esta extensão funcionar, existem arquivos DLL que devem estar disponíveis no PATH do sistema Windows. Veja o FAQ entitulado "Como eu adiciono o meu diretório PHP no PATH no Windows" para informações de como fazer isto. Mesmo que copiar os arquivos DLL da pasta do PHP no diretório system do Windows também funcione (porque o diretório system está por padrão no PATH do sistema), isso não é recomendado. Esta extensão requer que os seguintes arquivos estejam no PATH: fdftk.dll
Configurações em execução
Esta extensão não define nenhum parâmetro de configuração no php.ini.
Tipos Resource
fdf
Most fdf functions require a fdf resource as their first parameter. A fdf resource is a handle to an opened fdf file. fdf resources may be obtained using fdf_create(), fdf_open() and fdf_open_string().
Constantes pré-definidas
As contantes abaixo são definidas por esta extensão e somente estarão disponíveis quando a extensão foi compilada com o PHP ou carregada dinamicamente durante a execução.
- FDFValue (integer)
- FDFStatus (integer)
- FDFFile (integer)
- FDFID (integer)
- FDFFf (integer)
- FDFSetFf (integer)
- FDFClearFf (integer)
- FDFFlags (integer)
- FDFSetF (integer)
- FDFClrF (integer)
- FDFAP (integer)
- FDFAS (integer)
- FDFAction (integer)
- FDFAA (integer)
- FDFAPRef (integer)
- FDFIF (integer)
- FDFEnter (integer)
- FDFExit (integer)
- FDFDown (integer)
- FDFUp (integer)
- FDFFormat (integer)
- FDFValidate (integer)
- FDFKeystroke (integer)
- FDFCalculate (integer)
- FDFNormalAP (integer)
- FDFRolloverAP (integer)
- FDFDownAP (integer)
Exemplos
The following examples shows just the evaluation of form data.
Example#1 Evaluating a FDF document
<?php
// Open fdf from input string provided by the extension
// The pdf form contained several input text fields with the names
// volume, date, comment, publisher, preparer, and two checkboxes
// show_publisher and show_preparer.
$fdf = fdf_open_string($HTTP_FDF_DATA);
$volume = fdf_get_value($fdf, "volume");
echo "The volume field has the value '<b>$volume</b>'<br />";
$date = fdf_get_value($fdf, "date");
echo "The date field has the value '<b>$date</b>'<br />";
$comment = fdf_get_value($fdf, "comment");
echo "The comment field has the value '<b>$comment</b>'<br />";
if (fdf_get_value($fdf, "show_publisher") == "On") {
$publisher = fdf_get_value($fdf, "publisher");
echo "The publisher field has the value '<b>$publisher</b>'<br />";
} else
echo "Publisher shall not be shown.<br />";
if (fdf_get_value($fdf, "show_preparer") == "On") {
$preparer = fdf_get_value($fdf, "preparer");
echo "The preparer field has the value '<b>$preparer</b>'<br />";
} else
echo "Preparer shall not be shown.<br />";
fdf_close($fdf);
?>
Índice
- fdf_add_doc_javascript — Adds javascript code to the FDF document
- fdf_add_template — Adds a template into the FDF document
- fdf_close — Close an FDF document
- fdf_create — Create a new FDF document
- fdf_enum_values — Call a user defined function for each document value
- fdf_errno — Return error code for last fdf operation
- fdf_error — Return error description for FDF error code
- fdf_get_ap — Get the appearance of a field
- fdf_get_attachment — Extracts uploaded file embedded in the FDF
- fdf_get_encoding — Get the value of the /Encoding key
- fdf_get_file — Get the value of the /F key
- fdf_get_flags — Gets the flags of a field
- fdf_get_opt — Gets a value from the opt array of a field
- fdf_get_status — Get the value of the /STATUS key
- fdf_get_value — Get the value of a field
- fdf_get_version — Gets version number for FDF API or file
- fdf_header — Sets FDF-specific output headers
- fdf_next_field_name — Get the next field name
- fdf_open_string — Read a FDF document from a string
- fdf_open — Open a FDF document
- fdf_remove_item — Sets target frame for form
- fdf_save_string — Returns the FDF document as a string
- fdf_save — Save a FDF document
- fdf_set_ap — Set the appearance of a field
- fdf_set_encoding — Sets FDF character encoding
- fdf_set_file — Set PDF document to display FDF data in
- fdf_set_flags — Sets a flag of a field
- fdf_set_javascript_action — Sets an javascript action of a field
- fdf_set_on_import_javascript — Adds javascript code to be executed when Acrobat opens the FDF
- fdf_set_opt — Sets an option of a field
- fdf_set_status — Set the value of the /STATUS key
- fdf_set_submit_form_action — Sets a submit form action of a field
- fdf_set_target_frame — Set target frame for form display
- fdf_set_value — Set the value of a field
- fdf_set_version — Sets version number for a FDF file