Posted by M. Sokolewicz on 03/02/05 14:06

! is a logical NOT operator. It simply turns true => false, and false =>
true.

So, what you have is:
$a = true;
if($a) {
echo 'true';
} else {
echo 'false';
}

if(!$a) {
echo 'false!';
} else {
echo 'true!';
}

In these 2 cases, it will echo
true and true!

More info can be found here:
http://www.php.net/manual/en/language.operators.logical.php

William Stokes wrote:
> Hello
>
> Can someone explain this to me. I don't know how to read this.
>
> if (!$variable = mysql_query("select id,sessid from users where ...
>
> What is this "if(!"
>
> I mean the ! sign.
>
> Thanks
>
> -Will

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