[PHP] Re: [PHP5]__get, __set and isset()

[Greg Beaver]

Fr�d�ric hardy wrote:
Is it possible to do something like this :
class foo
{
    private $array = array();
    function __construct()
    {
        ...
    }
    function __get($key)
    {
        return (isset($this->array[$key]) == false ? null : 
$this->array[$key]);
    }

    function __set($key, $value)
    {
        $this->array[$key] = $value;
    }
}
$foo = new foo();
if (isset($foo->bar) == false)
    $foo->bar = 'bar';
else
    echo $foo->bar;
It seems that isset($foo->bar) return ALWAYS false.
Bug ?
Not a bug, __get() and __set() are called only if !isset($foo->var).
The purpose of __get and __set is to implement transparent getters and 
setters without forcing users to do

function setVal($val)
{
    $this->val = $val;
}
function getVal()
{
    return $this->val;
}
If you are not sure which properties even exist, you probably shouldn't 
be using __get()/__set(), or should refactor so that you can rely upon 
certain values existing.  If absolutely necessary, you can always provide

function ifexists($name)
{
    return isset($this->array[$name]);
}
and then you can if ($o->ifexists('a')) instead of if (isset($o->a))
Greg
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php