Array operator overloading

ArrayAccess interface is an excellent offer from PHP. Though I do not personally like the idea of operator overloading, this interface can be a great tool for developing application faster and neatly by overloading the array access.

The interface is to be implemented by a class and override the accessors methods.

I am giving a simple code that demonstrate its usage.

 class MyArray implements ArrayAccess {       
    private $arr = array();

    function offsetExists($name) {              
        return isset($name);
    }

    function offsetGet($name) {       
        return $arr[$name];
    }

    function offsetSet($key, $val) {       
        $arr[$key]=$val;
    }

    function offsetUnset($name) {       
        unset($arr[$name]);
    }
}
$arr = new MyArray();
$userMap["Hello"]="Worlds";
echo $userMap["Hello"];

This class can use a database for its model. The interface facilitates coding array style with similar __get() __set() functionalities for classes.

Btw, anybody knows how I can show codes like code in an editor with line number ?