bit field

BitField.php

<?php
/**
 * Manages variable as bitfield
 */
class BitField {
  private $value;


	/**
	 * @param int $value initial value
	 */
	public function __construct($value = 0) {
		$this->value = $value;
	}


	/**
	 * @return int result value
	 */
	public function getValue() {
		return $this->value;
	}


	/**
	 * @param $n
	 *
	 * @return bool
	 */
	public function get($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);
	}
}