ThinkPHP的模版中调用session数据的方法
ThinkPHP框架的模板中调用session数据的方法有很多，可以很据情况灵活运用，常见的有以下几类：
1.在模板中直接调用{$Think.session}获取session；
2.在
3.在模板中写,然后在里面直接编写php代码来调用$_SESSION；
4.在Action中将$_SESSION变量通过assign()方法赋值给模板；
5.在自定义函数库中，新建一个函数用来返回$_SESSION变量，然后在模板文件中使用{$变量命 | 函数名}来将函数返回的$_SESSION赋给模板中的一个变量
除了以上5种方法外，读者也可以按照自己的喜好开发新的调用方法。
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