<?php
class DBM {
    private $members;
    private $file;

    function __construct($file) {
        $this->file = $file;
        $this->members = @unserialize(
            file_get_contents($file)
        );
    }

    function __get($name) {
        return $this->members[$name];
    }

    function __set($name, $value) {
        $this->members[$name] = $value;
    }

    function __destruct() {
        $f = fopen($this->file,'w');
        fwrite($f,serialize($this->members));
        fclose($f);
    }
}

$dbm = new DBM(
    './presentations/slides/php5intro/db'
);

echo "Hello {$dbm->name}!\n";
$dbm->name = 'Sterling';
?>