How to change form field contents in existing PDF using PHP?

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                (Probably old issue but I didn't find a posting)

Simple case:
1. I have a PDF file I made with Acrobat PRO. It contains a form with
two fields, "Name" and "TestScore".
2. From my PHP file on linux server I just want to open this PDF file
and change the content of the Name and Testscore form fields.

Could someone show me a simple code example on this?

And what do I need of addons? PDFlib and licences?

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