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I haven't touched PHP in a long time, but the later releases makes me want to try it for a couple of small projects.

Is there any good introduction for people how "know" PHP4 and want to get started with PHP7, using best practises?

http://www.phptherightway.com might be of some help

I don't know PHP 7 yet, but I'd say there's plenty to learn just in PHP 5 if you haven't kept up since PHP 4. Perhaps a piecewise approach would be best, starting with the 'proper' C++/Java-esque version of OOP that I'd say is the biggest feature of PHP 5...

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