How does negation affect logical operators in PHP?

Negation in PHP can be achieved using the `!` operator. When negation is applied to logical operators like `&&` (AND) or `||` (OR), it reverses the truth value of the expression. This means that if the original expression evaluates to true, negating it will make it false, and vice versa. 

// Example of using negation with logical operators in PHP
$var1 = true;
$var2 = false;

// Negating an AND expression
if (!$var1 && $var2) {
    echo "This will not be executed.";
}

// Negating an OR expression
if (!$var1 || $var2) {
    echo "This will be executed.";
}

Keywords

negation logical operators PHP boolean operators

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