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

[Daniel Schierbeck]

Frédéric 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 ?
Fred.
It seems that you are right. I've tried off this code:
        <?php
        class OO
        {
                private $elem = array("a" => 1);
        
                public function __get ($prop)
                {
                        if (isset($this->elem[$prop])) {
                                return $this->elem[$prop];
                        } else {
                                return NULL;
                        }
                }
        
                public function __set ($prop, $val)
                {
                        $this->elem[$prop] = $val;
                }
        }
        $o = new OO();
        echo isset($o->a) ? "yes\n" : "no\n";
        echo isset($o->b) ? "yes\n" : "no\n";
        echo is_null($o->a) ? "yes\n" : "no\n";
        echo is_null($o->b) ? "yes\n" : "no\n";
        ?>
I expected something like this:
        yes
        no
        no
        yes
But got this:
        no
        no
        no
        yes
It looks like isset() can't handle object properties correctly. I'll 
post the bug on php.net.

--
Daniel Schierbeck
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