如何检查PHP对象是否是MongoDate对象？

Question

是否有类似MongoId :: isValid（$ id）的函数？如何确定对象是否是MongoDate对象？检查$ mongoDateObject-＆gt; sec isset（）？

Answer 1

1. if (is_a($mongoDateObject, 'MongoDate')) {...}
2. if (get_class($mongoDateObject) == 'MongoDate')) {...}

Answer 2

if ($mongoDateObject instanceof MongoDate) {...}