<!-- Collection of code snippets by Arne Vajhøj -->
<!-- posted to eksperten.dk, usenet and other places (2002-now) -->
<?php
class Login {
}

class User extends Login {
    public $userid;
    public $idfield = 'userid';
    public function __construct($userid) {
        $this->userid = $userid;
    }
}

class Admin extends Login {
    public $adminid;
    public $idfield = 'adminid';
    public function __construct($adminid) {
        $this->adminid = $adminid;
    }
}

$q = array();
$q[] = new admin(1);
$q[] = new user(2);

foreach($q as $q1) {
    echo $q1->{$q1->idfield} . "\r\n";
}
?>