PHP-de massiw salgylary

PHP-de, beýleki programmirleme dillerinden tapawutlylykda, massiwler salgylar üsti bilen geçirilmeýär, eýsem göçürilýär.

Muny görmek üçin:

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

Indi massiw salgylar üsti bilen geçirilýän etmeli:

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

Задание 1

Aşakdaky kodyň nähili netije berjekdigini aýdyň:

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

Задание 2

Aşakdaky kodyň nähili netije berjekdigini aýdyň:

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

Задание 3

Aşakdaky kodyň nähili netije berjekdigini aýdyň:

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