Аннотация
Many PHP applications are still running on PHP 5.x, not ready to take full advantage of the awesome features that PHP 7 offers. A lot of developers have not made the switch because of certain fears of compatibility issues, migration challenges and the strange awkward feeling that migrating their apps will take away a big chunk of their time.
![The Art of Computer Programming: Volume 3: Sorting and Searching [2nd Edition]](https://www.rulit.me/data/programs/images/the-art-of-computer-programming-volume-3-sorting-and-searchi_568628.jpg "The bible of all fundamental algorithms and the work that taught many of today")
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