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Re:PHP 7's new hashtable implementation by Tegran on Tuesday December 23, 2014 @05:43AM (#8787605)
If you do a Google search for "PHP6 Book" you'll see why they had to rename it:

https://www.google.com/#q=php6+book

Basically a lot of authors thought they'd get 'ahead of the game' and publish PHP6 books very early. If a 'real' PHP6 was released now, there would be confusion.

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