# the =SID?> is necessary to preserve the session id
# in the case that the user has disabled cookies
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session_register可以隐式地激发session_start(如果用户之前没发session_
start调用),当前的session注册了一个变量count,每次用户点击click here
的时候,这个变量都会增一。你可以自己试一下。=SID?>的意义不多赘述。