Bitmask Settings

<?php
//Bit class for settings
abstract class BitField {

    private $value;

    public function __construct($value=0) {
        $this->value = $value;
    }

    public function getValue() {
        return $this->value;
    }

    public function get($n) {
        return ($this->value & $n) == $n;
    }

    //turns a setting Bit to ON/TRUE
    public function set($n) {
        $this->value |= $n;
    }

    //turns a setting Bit to OFF/FALSE
    public function clear($n) {
        $this->value &= ~$n;
    }
}

//User settings using bits and the BitField class... super cool
class UserPrivacySettings extends BitField
{
    const PRIVACY_EMAIL = 1;
    const PRIVACY_NAME = 2;
    const PRIVACY_ADDRESS = 4;
    const PRIVACY_PHONE = 8;
    const PRIVACY_ALL = 15;
}


$bf = new UserPrivacySettings();

//Turning PRIVACY_EMAIL Setting to ON/TRUE using Bits
$bf->set(UserPrivacySettings::PRIVACY_EMAIL);

// Get PRIVACY_EMAIL Setting Bit value
if ($bf->get(UserPrivacySettings::PRIVACY_EMAIL))
{
    echo '<br><font color="green">PRIVACY_EMAIL Setting is ON/TRUE</font><br>';
}else{
    echo '<br><font color="red">PRIVACY_EMAIL Setting is OFF/FALSE</font><br>';
}


// Turning PRIVACY_EMAIL Setting Bit ZOFF/FALSE
$bf->clear(UserPrivacySettings::PRIVACY_EMAIL);

// Get PRIVACY_EMAIL Setting Bit value
if ($bf->get(UserPrivacySettings::PRIVACY_EMAIL))
{
    echo '<br><font color="green">PRIVACY_EMAIL Setting is ON/TRUE</font><br>';
}else{
    echo '<br><font color="red">PRIVACY_EMAIL Setting is OFF/FALSE</font><br>';
}

// The Bits value, this is the number that we will store in the users settings database or anywhere else, all the settings a user has on or off are determined from this number alone. this is the cool part and I have not seen anyone else use bit fields and stuff in PHP like my class here does, I like it.
echo $bf->getValue();

?>