What caution should be taken when comparing boolean values in PHP?

When comparing boolean values in PHP, it's important to use the strict comparison operator (===) instead of the loose comparison operator (==). This is because the loose comparison operator can lead to unexpected results due to PHP's type juggling. Using the strict comparison operator ensures that both the value and type of the variables are compared accurately.

$value1 = true;
$value2 = 1;

// Incorrect comparison using loose comparison operator
if ($value1 == $value2) {
    echo "Values are equal";
} else {
    echo "Values are not equal";
}

// Correct comparison using strict comparison operator
if ($value1 === $value2) {
    echo "Values are equal";
} else {
    echo "Values are not equal";
}