Description:
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The sample php.ini files included with PHP, in the section 
about implementing your own garbage collection if using 
session subdirectories, advocate running the following 
command in a crontab:

cd /path/to/sessions; find -cmin +24 | xargs rm

This doesn't work on Mac OS X; its BSD implementation of 
find requires that the first argument be the directory to 
search.

It seems to me that there is no need to cd to the directory, 
nor to pipe to xargs, to accomplish the goal; couldn't it be 
rewritten:

find /path/to/sessions -cmin +24 -delete