PHP Taskbook Level 8.10

Задание 1

Given a form with two inputs. Numbers are entered into the inputs. After submitting the form, check whether these numbers are friendly or not.

Задание 2

Given some array:

php<?php
  $arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
?>

Given a variable:

php<?php
  $n = 3;
?>

Turn this array into a two-dimensional one, with $n elements per subarray.

Задание 3

Given an array:

php[
  [1, 2, 3, 4, 5],
  [1, 2, 3],
  [1, 2],
]

Add enough empty strings to each subarray so that the number of elements in each subarray is equal to the number of elements in the longest subarray.

Задание 4

Given a list of some data for certain dates, stored in the following structure:

php<?php
  $data = [
    [
      'year' =>  2019,
      'month' => 11,
      'day' => 20,
      'data' => ['array with data']
    ],
    [
      'year' =>  2019,
      'month' => 11,
      'day' => 21,
      'data' => ['array with data']
    ],
    [
      'year' =>  2019,
      'month' => 12,
      'day' => 25,
      'data' => ['array with data']
    ],
    [
      'year' =>  2019,
      'month' => 12,
      'day' => 26,
      'data' => ['array with data']
    ],
    [
      'year' =>  2020,
      'month' => 10,
      'day' => 29,
      'data' => ['array with data']
    ],
    [
      'year' =>  2020,
      'month' => 10,
      'day' => 30,
      'data' => ['array with data']
    ],
    [
      'year' =>  2020,
      'month' => 11,
      'day' => 19,
      'data' => ['array with data']
    ],
    [
      'year' =>  2020,
      'month' => 11,
      'day' => 20,
      'data' => ['array with data']
    ],
  ]
?>

Write code that will convert the data structure into a structure like this:

php[
  year1: [
    month1: [
      Day 1: [data array],
      Day 2: [data array],
      Day 3: [data array],
    ],
    month2: [
      Day 1: [data array],
      Day 2: [data array],
      Day 3: [data array],
    ]
  ]
  year2: [
    month1: [
      Day 1: [data array],
      Day 2: [data array],
      Day 3: [data array],
    ],
    month2: [
      Day 1: [data array],
      Day 2: [data array],
      Day 3: [data array],
    ]
  ]
]