Exponentiation Precedence in PHP

The exponentiation operation has precedence over multiplication and division. In the following example, exponentiation will be performed first, and then multiplication:

<?php
	echo 2 * 2 ** 3;
?>

Without running the code, determine what will be displayed on the screen:

<?php
	$a = 3 * 2 ** 3;
	echo $a;
?>

Without running the code, determine what will be displayed on the screen:

<?php
	$a = (3 * 2) ** 3;
	echo $a;
?>

Without running the code, determine what will be displayed on the screen:

<?php
	$a = 3 * 2 ** (3 + 1);
	echo $a;
?>

Without running the code, determine what will be displayed on the screen:

<?php
	$a = 2 ** 3 * 3;
	echo $a;
?>

Without running the code, determine what will be displayed on the screen:

<?php
	$a = 3 * 2 ** 3 * 3;
	echo $a;
?>