PHP-da pastki satrlarni hisoblash

Задание 1

Satr berilgan:

php<?php
  $str = 'aaa bbb ccc';
?>

Ushbu satrdagi so‘zlar sonini hisoblang.

Задание 2

Satr berilgan:

php<?php
  $str = 'hello hello world hello';
?>

'hello' pastki satri satrda necha marta uchrashini hisoblang.

Задание 3

Satr berilgan:

php<?php
  $str = '※※※';
?>

'※' pastki satri satrda necha marta uchrashini hisoblang.

Задание 4

Satr berilgan:

php<?php
  $str = 'abracadabra';
?>

Satrda har bir belgi necha marta uchrashini hisoblang.

Задание 5

Satr berilgan:

php<?php
  $str = 'The quick brown fox jumps over the lazy dog';
?>

Uch belgidan uzun so‘zlar sonini hisoblang.