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Especially programming, such as PHP, C#, etc. With a print version, I learn at rocket speed but with PDF (or even online such as W3Schools), I'm never past table of contents! Am I alone? Is it a disease or the vertical screen that is the problem?
You may download PHP manual from http://pk1.php.net/download-docs.php.
It's not in PDF but you may download it in HTML or CHM format to read it offline.