关于session的垃圾回收机制有关问题
关于session的垃圾回收机制问题！
seession.gc_maxlifetime=1440;
seesion.gc_probalility=1;
session.gc_divisor=1000;
上述我的理解是千分之1的用户才可能用到session；但是如果是千分之1的几率
，那就不对了，session怎么进行啊？？求一个满意的解释。。
------解决方案--------------------
引用的一段解释：
PHP处理session的原理也不例外，但是在具体的实现方式上，却与众不同。这是因为，由于PHP的工作机制，它并没有一个后台线程，来定时地扫描session信息并判断其是否失效。它的解决之道是，当一个有效请求发生时，PHP会根据某个概率，来决定是否调用一个GC（Garbage Collector）。GC的工作，就是扫描所有的session信息，用当前时间减去session的最后修改时间（modified date），同配置参数（configuration option）session.gc_maxlifetime的值进行比较，如果生存时间已经超过gc_maxlifetime，就把该session删除。这是很容易理解的，因为如果每次请求都要调用GC代码，那么PHP的效率就会低得令人吃不消了。这个概率取决于配置参数 session.gc_probability/session.gc_divisor的值（可以通过php.ini或者ini_set()函数来修改）。默认情况下，session.gc_probability = 1，session.gc_divisor=100，也就是说有1%的可能性会启动GC。
这三个参数，session.gc_maxlifetime/session.gc_probability /session.gc_divisor都可以通过php.ini或者ini_set()函数来修改。但要记得，如果使用ini_set()函数的话，必须在每一个页面的开始处都调用ini_set()。
阅读全文：http://koda.iteye.com/blog/319605
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