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I know there is an official document for Java (JLS), I'd like to know if it's also the case of PHP language. I found the "Language Reference" section on the PHP manual, but it doesn't look as detailed as the JLS.
The thing is I have a good practical knowledge of PHP but I'm miserably clueless about what really happens under the hood.
If there isn't any official document, could you recommend me some good books to read?
In this post, the HHVM Community announced a specification for PHP: http://hhvm.com/blog/5723/announcing-a-specification-for-php
It's now located in the following Github repo: https://github.com/php/php-langspec