/**
* Returns the pdftk singleton.
* @return Pdftk the Pdftk singleton.
*/
public static function getInstance()
{
if (empty(self::$_instance)) {
self::$_instance = new Pdftk();
}
return self::$_instance;
}
/**
* Fill the PDF form
* @param boolean $runValidation whether to perform validation before filling the form.
* If the validation fails, the data will not be filled in.
* @param array $attributes list of attributes that need to be saved. Defaults to null,
* meaning all attributes that are loaded from PDF meta data will be filled.
* @return PdfString instance of filled form on sucess false on failure
*/
public function fill($runValidation = true, $attributes = null)
{
if (!$runValidation || $this->validate($attributes)) {
$pdftk = Pdftk::getInstance();
if (false !== ($result = $pdftk->fillForm($this, $this->getFdf($attributes)))) {
return new PdfString($result);
}
}
return false;
}
/**
* Constructor.
* @param PdfFile $pdf the PDF file instance
*/
public function __construct(PdfFile $pdf)
{
$this->_pdf = $pdf;
$pdftk = Pdftk::getInstance();
$result = $pdftk->dumpDataFields($pdf);
for ($i = 0, $count = count($result); $i < $count; $i++) {
$column = array();
while ($i < $count && '---' !== $result[$i]) {
list($name, $value) = explode(':', $result[$i], 2);
$column[trim($name)] = trim($value);
$i++;
}
if (isset($column['FieldName'])) {
$this->fields[$column['FieldName']] = $column;
}
}
}
/**
* Apply another PDF as background for each page of current PDF
* @param PdfFile $back an instance of PdfFile which will be used as a background
* @return PdfString an instance of PdfString with applied background
* on success, false on failure
*/
function applyBackground(PdfFile $back)
{
$pdftk = Pdftk::getInstance();
$result = $pdftk->background($this, $back);
return $result ? new PdfString($result) : false;
}
