RE: "!" in front of a variable?

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[snip]
I've got some code from someone else I've inherited and need to sort out
some problems with.  The programmer that wrote it originally was much
better than I and programmed a little over my head to say the least.

One function that I've come across that has 5 variables as input:

function($var1,$var2,!$var2,$var3->cc,$var3->bcc);

The question I have is on the 3rd input variable, what does the "!" in
front of $var2 do to that variable?
[/snip]

Hmmm. Looks like a weird mistake, to be sure. If $var2 is boolean it should
pass the opposite of its current state. Is $var2 a boolean? It is being
passed twice here, once AS and once AS NOT.

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