[veewee]

php-soap/encoding wants to stop writing xsi:nil for optional elements whose property was never set (php-soap/encoding#71). After optional_property() reads null, the encoder has to tell a property that holds null apart from one that is missing or uninitialised. The answer follows the same PHP lookup rules the lens already handles, so I put it here instead of in the encoder.

Reflect\property_is_initialized(object $object, string $name): bool resolves the property in the same order as optional_property(): the class itself, then a dynamic property, then private properties on parent classes. It keeps no cache, returns no ReflectionProperty and never calls __get. When PHP throws while checking, for example in a lazy object whose initializer fails, it reports the property as present, so a caller keeps writing the value it read.

I gave the function its own body instead of pulling a shared resolver out of optional_property(), so the lens read path stays as it is. A parity test runs both over the same fixtures to catch drift.

On PHP 8.4, ReflectionProperty::isInitialized() initialises a lazy ghost or proxy, so calling this on a lazy object that nobody touched yet has that side effect.

Cost per call next to optional_property() (ns, PHP 8.4, xdebug off, median of 3 phpbench rounds):

case	optional_property	property_is_initialized
typed, initialised	160	117
typed, uninitialised	165	115
stdClass, present	94	71
stdClass, missing	100	82
private property on a parent	200	154