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I recently read about quicksort and was wondering whether it would be smart to build my own function to sort things with quicksort or if it would be inefficent. What do you think is the built in sort function better than a selfbuilt quicksort function?
From http://php.net/sort
The core PHP functions will be implemented in c, rather than PHP, so they should generally be significantly faster than anything you can write yourself in PHP. There will be cases where it is faster to write your own, but I guess these would be when you have a very specific case and you can make your own specific optimisations for that. I think that is unlikely to be the case here.