What is the purpose of the crc function in php

I have a variable\[code\] $offset = abs(crc32($_SERVER["SERVER_NAME"]) % 500);\[/code\]and I do not understand it's place in the script. All it seems to do is generate a random number based on the server name (e.g. www.example.com). Is that a correct interpretation of this variable? Thanks
 
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