PHP Bitmasks

phpbitmask.php

<?php
//Define our bitmask
define("allowEverythingBitmask",1); //In binary 0001
//Our user
class User {
	private $permissionBitmask = 1; //In binary 0001

	public function setPermissionBitmask($bitmask)
	{
		$this->permissionBitmask = $bitmask;
	}

	public function getPermissionBitmask()
	{
		return $this->permissionBitmask;
	}

}

$user = new User;
//Test if user can do everything

if((allowEverythingBitmask & $user->getPermissionBitmask()))
{
	echo "I can do everything!";
}



define("allowViewBitMask",1);        //In binary 0001
define("allowEditBitMask",2);         //In binary 0010
define("allowCreateBitMask",4);     //In binary 0100
define("allowDeleteBitMask",8);     //In binary 1000

$user2 = new User();
$user2->setPermissionBitmask(allowViewBitMask | allowEditBitMask);


if((allowViewBitMask & $user2->getPermissionBitmask()))
{
	echo "I can view!";
}
if((allowEditBitMask & $user2->getPermissionBitmask()))
{
	echo "I can edit!";
}
else
{
	echo "I can't edit :( ";
}



$user3 = new User();
$user3->setPermissionBitmask(allowViewBitMask);


if((allowViewBitMask & $user3->getPermissionBitmask()))
{
	echo "I can view!";
}
if((allowEditBitMask & $user3->getPermissionBitmask()))
{
	echo "I can edit!";
}
else
{
	echo "I can't edit :( ";
}

if((allowCreateBitMask & $user->getPermissionBitmask()))
{
	echo "I can create!";
}
else
{
	echo "I can't create :( ";
}

$userPermissions = $user->getPermissionBitMask();
$userPermissions |= allowCreateBitMask;
$user->setPermissionBitMask($userPermissions);

if((allowCreateBitMask & $user->getPermissionBitmask()))
{
	echo "I can create!";
}

$userPermissions |= allowCreateBitMask;


$user ->setPermissionBitMask(allowViewBitMask | allowEditBitMask | allowCreateBitMask | allowDeleteBitMask  );
checkPermissions($user);

$userPermissions = $user->getPermissionBitMask();
$userPermissions ^= allowCreateBitMask;
$user->setPermissionBitMask($userPermissions);
checkPermissions($user);

function checkPermissions($user) {

	if((allowViewBitMask & $user->getPermissionBitmask()))
	{
		echo "I can view!";
	}
	else
	{
		echo "I can't view :( ";
	}
	if((allowEditBitMask & $user->getPermissionBitmask()))
	{
		echo "I can edit!";
	}
	else
	{
		echo "I can't edit :( ";
	}
	if((allowCreateBitMask & $user->getPermissionBitmask()))
	{
		echo "I can create!";
	}
	else
	{
		echo "I can't create :( ";
	}
}

?>