Querying the metadata of a PDF file produces too few results

[Calvinstefan]

Hello,
I try to read the metadata of a PDF file with the following code:

$data = $pdf->getData();
$txt  = (string) $data;

I expect a result as mentioned in the source example src/InfoFile.php, like:

array (
'Title',
'Author',
'Subject',
'Keywords',
'Creator',
'Producer',
'CreationDate',
'ModDate',
'Trapped',
);

First and foremost I need the values ​​of the fields Creator and Producer.
But I only get:

Warning: no info dictionary found
PdfID0: a4ca5463835c33c75b290e9a523c9bcb
PdfID1: a4ca5463835c33c75b290e9a523c9bcb
NumberOfPages: 1
PageMediaBegin
PageMediaNumber: 1
PageMediaRotation: 0
PageMediaRect: 0 0 595.2 841.6
PageMediaDimensions: 595.2 841.6

Please, tell me how I can read the two mentioned fields of a PDF file using your PHP library.
Thank you!

Greetings,
Stefan

[mikehaertl]

This library will only forward whatever information it receives from pdftk. In this case it seems that the PDF does not contain more information, as this warning indicates:

Warning: no info dictionary found

So you should find out, how to add this information to the PDF. It's beyond the scope of this library.

[Calvinstefan]

Many thanks for your response! But I'm sure the PDF containes the informations I want to read via pdftk (please see the screenshot).

How can I read the marked information using PDFTK?
Thank you.

[mikehaertl]

The lib does pdftk some.pdf dump_data_utf8 internally.