<?php
class Enum {
    protected $self = array();
    public function __construct( /*...*/ ) {
        $args = func_get_args();
        for( $i=0, $n=count($args); $i<$n; $i++ )
            $this->add($args[$i]);
    }
   
    public function __get( /*string*/ $name = null ) {
        return $this->self[$name];
    }
   
    public function add( /*string*/ $name = null, /*int*/ $enum = null ) {
        if( isset($enum) )
            $this->self[$name] = $enum;
        else
            $this->self[$name] = end($this->self) + 1;
    }
}

class DefinedEnum extends Enum {
    public function __construct( /*array*/ $itms ) {
        foreach( $itms as $name => $enum )
            $this->add($name, $enum);
    }
}

class FlagsEnum extends Enum {
    public function __construct( /*...*/ ) {
        $args = func_get_args();
        for( $i=0, $n=count($args), $f=0x1; $i<$n; $i++, $f *= 0x2 )
            $this->add($args[$i], $f);
    }
}
?>