PHPda Massiv Havolaları

PHPda, boshqa dasturlash tillaridan farqli o'laroq, massivlar ham havola orqali emas, balki nusxalanish orqali uzatiladi.

Keling, bunga ishonch hosil qilaylik:

php<?php
  $arr1 = [1, 2, 3, 4, 5];
  $arr2 = $arr1;
  $arr2[0] = '!';
  
  var_dump($arr1); // o'zgarmaydi
?>

Keling, endi massivni havola orqali uzatishga majbur qilaylik:

php<?php
  $arr1 = [1, 2, 3, 4, 5];
  $arr2 = &$arr1;
  $arr2[0] = '!';
  
  var_dump($arr1); // o'zgaradi
?>

Задание 1

Kod natijasi qanday bo'lishini tushuntiring:

php<?php
  $arr1 = [1, 2, 3, 4, 5];
  
  $arr2 = $arr1;
  $arr2[0] = '!';
  
  echo $arr1[0];
  echo $arr2[0];
?>

Задание 2

Kod natijasi qanday bo'lishini tushuntiring:

php<?php
  $arr1 = [1, 2, 3, 4, 5];
  
  $arr2 = &$arr1;
  $arr1[0]++;
  
  echo $arr1[0];
  echo $arr2[0];
?>

Задание 3

Kod natijasi qanday bo'lishini tushuntiring:

php<?php
  $arr1 = [1, 2, 3, 4, 5];
  
  $arr2 = &$arr1;
  
  $arr1[0]++;
  $arr2[0]++;
  
  echo $arr1[0];
  echo $arr2[0];
?>