How does the logical operator "Not" (!) work in PHP?

The logical operator "Not" (!) in PHP is used to negate the boolean value of an expression. It essentially flips the boolean value from true to false or vice versa. This operator is useful when you want to check if a condition is not true before executing a certain block of code. Example: 

$isLoggedIn = false;

if (!$isLoggedIn) {
    echo "User is not logged in.";
}

Keywords

logical operator Not ! PHP programming

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