If you are asking if you can use a snippet of code that was posted on PM in your own work, in most cases the answer is "yes".
This question has come up before, and while there has been much discussion I don't think there is a site policy posted somewhere. Some monks (such as xdg) have included a specific license statement in their signature, but this is the exception rather than the rule.
The following threads may be of interest (I found them using Super Search):
Update: added one link
In reply to Re: A Copyright/License question
by bobf
in thread A Copyright/License question
by AgedOne
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