Notes on php

1, method when session passes object.
Under normal circumstances, the session only needs to save some basic types of data, such as strings.
But if it is a custom class, you need to use serialization and deserialization

<code>1.1，$UserData = new ......;//创建对象

1.2， $_SESSION['UserData'] = serialize($UserData );//序列化类传递

1.3，$UserData = unserialize($_SESSION["UserData"]);//反序列化类接受
</code>

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