Shuffling Arrays in PHP

shuffle

Задание 1

Given an array:

php<?php
  $arr = [1, 2, 3, 4, 5];
?>

Shuffle its elements in random order.

Задание 2

Fill an array with numbers from 1 to 25 using range, and then shuffle its elements in random order.

Задание 3

Create an array filled with letters from 'a' to 'z' so that the letters are in random order and do not repeat.