Generating GUID tags with php



Does anyone have any suggestions on generating GUID (Globally Unique
Identifier) tags with php?
They would need to be in the format
4402bd8a-cd51-40ea-99d7-b510e89e344b

Specifically this is for adding accessibility for the PicLens browser
add-on (which uses an .rss file) to some of our photo gallery pages. It
seems to require each thumbnail have an identical GUID tag in both the
html and the rss file.
.



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