FormItPDF

FormItPDF.php

<?php
$fileIn = $hook->formit->config['fileIn'];
$fileOut = $hook->formit->config['fileOut'];

$fileInPath = $modx->config['base_path'].$fileIn;
$fileOutPath = $modx->config['base_path'].$fileOut;

$formData = $hook->getValues();

// FDF header section
$fdf .= '%FDF-1.2
1 0 obj<</FDF<< /Fields[';

foreach ($formData as $key => $value) {
    $fdf .= '<</T(' . $key . ')/V(' . $value . ')>>';
}

// FDF footer section
$fdf .= '] >> >>
endobj
trailer
<</Root 1 0 R>>
%%EOF';

// Creating a temporary file for our FDF file.
$FDFfile = tempnam(sys_get_temp_dir(), gethostname());

file_put_contents($FDFfile, $fdf);

// Merging the FDF file with the raw PDF form
exec("pdftk $fileInPath fill_form $FDFfile output $fileOutPath flatten");

// Removing the FDF file as we don't need it anymore
unlink($FDFfile);

$modx->setPlaceholder('download', $fileOut);
return true;