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<?php $r = new \ReflectionClass(\DateTime::class); $p = $r->getConstructor()->getParameters(); foreach($p as $arg){ var_dump($arg->getName()); var_dump($arg->isDefaultValueAvailable()); }
Output for git.master, git.master_jit, rfc.property-hooks
string(8) "datetime" bool(true) string(8) "timezone" bool(true)

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