Homonymous Function Variables in PHP

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

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

Explain what the result of executing the code will be:

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

Explain what the result of executing the code will be:

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

Explain what the result of executing the code will be:

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