How to read the contents of a PDF file in a pdflib library

How to read the contents of a PDF file in a pdflib library
I downloaded a tarball from the official website of http://www.pdflib.com and then extracted the Libpdf_php.dll into the PHP ext folder and enabled the extension of the DLL. How to use Pdflib library to read the data in PDF file???

Note: The PDF file is not generated.

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http://www.pdflib.com/en/pdflib-cookbook/pdf-on-the-web-server/starter-webform/php-starter-webform/

Here is an example, I do not know the LZ saw no

The cook Book download is also available on his website

You can see what's written in Cook's book.
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Just looked.
http://www.pdflib.com/download/pdflib-family/pdflib-8/Download the version you need
I'm under the Win32 version.
There is a Doc folder inside, which are all tutorials and instructions.

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