BitField.php

<?php

/**
 * based on the BitField described in http://stackoverflow.com/questions/5319475/bitmask-in-php-for-settings
 */
class EtuDev_Util_BitField
{
    const DEFAULT_VALUE = 0;

    private $value;

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

    public function load($value = null)
    {
        $this->value = (int) (is_numeric($value) ? $value : static::DEFAULT_VALUE);
    }

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

    public function get($n)
    {
        return ($this->value & (1 << $n)) != 0;
    }

    public function set($n, $new = true)
    {
        $this->value = ($this->value & ~(1 << $n)) | ($new << $n);
    }

    public function clear($n)
    {
        $this->set($n, false);
    }

    public function applyMask($mask)
    {
        $this->value = $this->value & (int) $mask;
    }
}