엄격한 불일치(!==) 및 정수 덧셈 비교 시각화

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>비교 연산자</title>
    </head>
    <body>
        <?php
        $a = 99.9 + 0.1;
        $b = 99 + 1;

        echo "100 === 99.9 + 0.1 : ";
        var_dump(100 === $a);
        echo "<br>";

        echo "100 !== 99.9 + 0.1 : ";
        var_dump(100 !== $a);
        echo "<br>";

        echo "100 === 99 + 1 : ";
        var_dump(100 === $b);
        echo "<br>";

        echo "100 !== 99 + 1 : ";
        var_dump(100 !== $b);
        echo "<br>";
        ?>
    </body>
</html>