PHP: 'rotate' an array?

Question

is it possible to easily \'rotate\' an array in PHP ?

Like this: 1, 2, 3, 4 -> 2, 3 ,4 ,1

Is there some kind of built-in PHP function for this?

Answer 1

There's a task about array rotation on Hackerrank: https://www.hackerrank.com/challenges/array-left-rotation/problem.

And proposed solution with array_push and array_shift will work for all test cases except the last one, which fails due to timeout. So, array_push and array_shift will give you not the fastest solution.

Here's the faster approach:

function leftRotation(array $array, $n) {
   for ($i = 0; $i < $n; $i++) {
       $value = array[$i]; unset(array[$i]); array[] = $value;
   }
   return array;
}