PHPda satrlarni tekshirish

Задание 1

Satr berilgan:

php<?php
  $str = 'document.pdf';
?>

Satr '.pdf' bilan tugaydimi tekshiring.

Задание 2

Satr berilgan:

php<?php
  $str = 'https://example.com';
?>

Satr 'https://' bilan boshlanadimi tekshiring.

Задание 3

Satr berilgan:

php<?php
  $str = 'The quick brown fox';
?>

Satr 'fox' qismini o‘z ichiga oladimi tekshiring.

Задание 4

Satr berilgan:

php<?php
  $str = 'image.png';
?>

Satr '.png' yoki '.jpg' bilan tugaydimi tekshiring.

Задание 5

Satr berilgan:

php<?php
  $str = 'admin@example.com';
?>

Satr '@' belgisini o‘z ichiga oladimi va '.com' bilan tugaydimi tekshiring.