Question

This does work:

$test = new Test();
$test->blah();

class Test // extends DateInterval
{
    private $foo = 0;

    public function __construct() {}

    public function blah()
    {
        echo $this->foo;
        echo $this->bar;
    }

    public function __get($n) { echo $n; }
}

The output is, as expected, 0bar.

But as soon as I uncomment the extends DateInterval part, I get an error:

Fatal error: Test::blah(): Unknown property (foo)

This happens with PHP 5.3.2 on Linux and it does not happen with PHP 5.3.8 on Windows.

Answer 1

Apparently it’s a bug that got fixed in version 5.3.6 according to this and this page.

Fixed bug #52738 (Can't use new properties in class extended from DateInterval). (Stas)

Seems your only option is to switch to another PHP version.