What does this function definition mean in perl?

Posted by Neeraj on Stack Overflow See other posts from Stack Overflow or by Neeraj
Published on 2010-03-20T22:44:24Z Indexed on 2010/03/20 22:51 UTC
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I have been doing perl from some time but today i came across this code:

sub function1($$)
{
   //snip
}

what does this mean in perl?

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