What version of PHP was ReflectionClass introduced

问题:

What version of PHP was ReflectionClass introduced in?

for example:

$objMetaData = new ReflectionClass('Direction');
$arrValidDirections = $objMetaData->getConstants();

回答1:

According to the changes log for PHP5, the reflection API was introduced in the second beta of PHP 5.0.0. i suppose that ReflectionClass was introduced in the same time, but I'm not sure.