Homonymous Function Variables in PHP

Changes to internal function variables do not affect external variables with the same name:

php<?php
  $num = 1;
  
  function func()
  {
    $num = 2;
  }
  
  func();
  echo $num; // 1
?>

Задание 1

Explain what the result of executing the code will be:

php<?php
  $aaa = 111;
  
  function func()
  {
    $aaa = 222;
  }
  
  func();
  echo $aaa;
?>

Задание 2

Explain what the result of executing the code will be:

php<?php
  $aaa = 111;
  
  function func()
  {
    $aaa++;
  }
  
  func();
  echo $aaa;
?>

Задание 3

Explain what the result of executing the code will be:

php<?php
  $aaa = 111;
  
  function func()
  {
    $aaa = 222;
    return $aaa;
  }
  
  echo func();
?>