What is the function of by a !! in an if for example? I know that ! by itself reverses the value of a boolean result, but I tested !! and nothing changed in the result, eg:
$teste = true;
if(!!$teste) {
echo "é verdade!";
} else {
echo "é mentira!";
}
and resulted in true that if
The ! operator negates. If I put another ! before, I'll be denying the first negation.
That is:
If i == verdade and !i == falsa , then !!i == verdade
I could have more denial operators before.
That is, I could have this:
$teste = true;
if(!!!!$teste) {
echo "é verdade!";
} else {
echo "é mentira!";
}
... that works fine. I would be denying a denial.