Description:
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From manual page: http://www.php.net/session.configuration
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The description of session.save_path gives an infeasible suggestion for the depth of the session directory tree: 

"There is an optional N argument to this directive that determines the number of directory levels your session files will be spread around in. For example, setting to '5;/tmp' may end up creating a session file and location like /tmp/4/b/1/e/3/sess_4b1e384ad74619bd212e236e52a5a174If ."

People may try to use this kind of figure without thinking about what they're doing. They probably won't be *able* to create 64^5 directories, but once they find that out, they may be tempted to split the difference - even 64^3 is over 1Gb and 256k inodes on most systems, just for the structure.

Something like "If you're considering a value beyond 1 or 2, you may want to look into a different session.save_handler." would be helpful.

Also, the dir_indexes option for ext2/3/4 can help with large session directories, though I don't know if PHP gives such specific advice.