what does $$ in php means

Posted by user295189 on Stack Overflow See other posts from Stack Overflow or by user295189
Published on 2010-05-06T05:55:38Z Indexed on 2010/05/06 5:58 UTC
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php5

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php

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php5.3

what does two back to back $ behind a variable means. Like this $$id

where can I find more information on that Thanks

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