BITWISE HANDLER : GESTION DES BITS POUR GÉRER LES DROITS

<?php

	/**
	 * Classe de gestion des bits
	 */	 	
	abstract class byte {
		private $value;
		private $const;
		public function __construct($value = 0) {
			$this->value = $value;
		}
		public function set($flag, $value) {
			if ($value) {
				// SET BIT 1
				$this->value = $this->value | $flag;
			} else {
				// SET BIT 0
				$this->value = $this->value & ~$flag;
			}
		}
		public function get($flag) {
			return (($this->value & $flag) == $flag);
		}
		public function get_enum() {
			if (!$this->const) {
			    $reflect = new ReflectionClass(get_class($this));
		    	$this->const = $reflect->getConstants();
			}
		    return $this->const;
		}
		public function __get($key) {
			$c = $this->get_enum();
			if (isset($c[$key])) {
				return $this->get($c[$key]);
			} else throw new Exception('Definition not found');
		}
		public function __set($key, $value) {
			if (!is_bool($value)) throw new Exception('Boolean value expected !');
			$c = $this->get_enum();
			if (isset($c[$key])) {
				return $this->set($c[$key], $value);
			} else throw new Exception('Definition not found for '.$key);
		}
		public function __call($func, $args) {
			$action = substr($func, 0, 3);
			$key = strtolower(substr($func, 3));
			$c = $this->get_enum();
			if ($action == 'can') {
				if (isset($c[$key])) {
					return $this->get($c[$key]);
				} else throw new Exception('Definition not found for '.$key);				
			} else if($action == 'set') {
				if (isset($c[$key])) {
					if (isset($args[0])) {
						if (is_bool($args[0])) {
							return $this->set($c[$key], $args[0]);
						} else {
							throw new Exception('Boolean value expected !');
						}
					} else {
						return $this->set($c[$key], true);
					}
				} else throw new Exception('Definition not found for '.$key);								
			} else throw new Exception('Undefined function '.$func);
		}
	}

	/**
	 * Un exemple de classe
	 */	 	
	class userRights extends byte {
		const read		= 1; // 001
		const write		= 2; // 010
		const delete		= 4; // 100
		const admin		= 7; // 111
	}

	/**
	 * Instanciation avec valeurs par défaul
	 */	 	
	$foo = new userRights(
		userRights::read |
		userRights::write | 
		userRights::delete
	);
	
	// MANIPULATION
	$foo->write = false;
	$foo->setRead(false);
	$foo->setRead();
	
	// AFFICHAGE
	echo 'Read : '.$foo->read.'<hr />';
	echo 'Write : '.$foo->write.'<hr />';
	echo 'Delete : '.$foo->canDelete();
?>