PHP Taskbook Level 3.9

Задание 1

Given a string, check that this string consists only of numbers.

Задание 2

Given a string, check that this string consists of only even digits.

Задание 3

Given an array of numbers, remove from it numbers that have two or more zeros.

Задание 4

Find all numbers from 1 to 1000 whose sum of digits is 13.

Задание 5

Create the following array using loops:

php[
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9],
]