国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

<form action="" method="get">
    <label for="score">請(qǐng)輸入成績(jī)：</label><input type="number" id="score" name="score" max="100" value="">
    <button>提交</button>
</form>

$init = $_GET['score'];
switch($init){
    case $init >=90 :
    echo '<p>厲害了，我的學(xué)霸！</p>';
    break;
    case $init >=80 :
    echo '<p>再接再厲，努力吧！</p>';
    break;
    case $init >=70 :
    echo '<p>差太多啦！得加油趕上了?。?lt;/p>';
    break;
    case $init >=60 :
    echo '<p>建議你留級(jí)吧?。?lt;/p>';
    break;
    default:
        break;
}

Obviously no parameters have been passed to the form yet, so how come the first case is output? At this time, the $init variable is empty. How can it be judged successful? ? What's going on? ?