php中设置多级目录session的问题
php默认会把session保存在 /tmp 下，但是当session文件过多时会对性能造成很大影响，设置分级目录是个好办法
在 php.ini 中找到 session.save_path 将值设置为 session.save_path = '3;/tmp/session'; 即可开启三级目录保存session。但是php不会自动生成目录结构，这时可以借助源码包 ext/session 目录下的 mod_files.sh 来生成目录
$ bash mod_files.sh /tmp/session 3
生成完成后发现仍然不能生成session，纠结了半天，打开mod_files.bat才发现玄机，原来后面还需要带一个参数，对应于 php.ini 中的 session.hash_bits_per_character ，这个值默认是4，development和production版本的默认配置里是5，于是用下面的命令从新生成目录
$ bash mod_files.sh /tmp/session 3 5
终于可以登录了。
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