一般来说php面向象的取值用->符号，即先new了一个对象，再用这个箭头工具获取类中的方法和属性。但发现下图中竟然没有new也能用这个箭头取值，这如何理解呢？难道php还有潜规则吗，即没有明说的规则吗
回复讨论(解决方案)
$mysql->query() 返回的是一个 对象，已经实例化。
$mysql->query() 返回的是一个 对象，已经实例化。
看来真如我所料，php中确实有不为人知的秘密，这也是为啥初学者看不懂的原因。其实这里告诉 游戏规则就行了，但是不告诉，不知为啥，可能有人会说，这个不是明摆着吗，试想学习一个技术最难的是第一次接触时，因为你不知道它的规则，你接触后出现了一些问题，然后就知道了，这是另一回事。
看来php还有很多不想告诉初学者的秘密，真让人发指！
初学习php的人们一定要有一个思想意识：php有很多不可告人的秘密，而这些就是那些所谓老手炫耀的所谓技术，这听起来真让人恶心。估计这种人的心态可能因为当初也是初php虐待过，所以留有后遗病，至今到此耿耿于怀，所以看到别的初学php的人也产生了嫉妒心态，心想当初我学的时候都那么难，到你这也要更难，这是一种多么小人的心态哈，并且这种人动不动嘴里就来一句口头语，查手册，我真想操你妈！
正告那些所谓的老手，你妈逼，查手册不用你提，需要你教如何查，难道就你知道查手册不成，你妈逼，你遇到问题后难道一查手册就解决了吗？我真想操你妈！
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