您可以在会话中存储任意数量的数据.所有会话都存储在服务器上.您可以达到的唯一限制是脚本一次可以消耗的最大内存，默认情况下为128MB.

You can store as much data as you like within in sessions. All sessions are stored on the server. The only limits you can reach is the maximum memory a script can consume at one time, which by default is 128MB.

(类似的答案:理想的PHP会话大小?-一些有用的注释)

(Similar answers: Ideal PHP Session Size? - some useful comments)