Kuongeza Vipengele vya Safu katika PHP

Pia unaweza kutumia shughuli za nyongeza na upungufu:

php<?php
  $arr = [1, 2, 3, 4];
  
  $arr[0]++;
  ++$arr[1];
  $arr[2]--;
  --$arr[3];
  
  var_dump($arr); // itatoa [2, 3, 2, 3]
?>

Задание 1

Imetolewa kifuatacho cha kificho:

php<?php
  $arr = ['a' => 1, 'b' => 2, 'c' => 3];
  
  $arr['a']++;
  $arr['a']++;
  $arr['b']--;
  $arr['c']--;
  $arr['c']--;
  
  var_dump($arr);
?>

Bila kuendesha kificho, tueleze, kitakuwaje matokeo ya kitendakazi var_dump.