HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div>
<form action="./page6-data.php" method="POST">
学号： <input type="text" name="code"><br>
<input type="submit" value="查询">
</form>
</div>
</body>
</html>
PHP
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div>
<?php
$code = $_POST['code'];
// $arr 所有的学号
$arr = array();
$arr['123'] = array("username" => "张三", "chinaese" => "140", "math" => "149", "english" => "120");
$arr['124'] = array("username" => "李四", "chinaese" => "40", "math" => "142", "english" => "10");
$arr['125'] = array("username" => "王五", "chinaese" => "120", "math" => "12", "english" => "20");
$arr['126'] = array("username" => "赵六", "chinaese" => "110", "math" => "119", "english" => "50");
// 如果是管理员，则遍历所有成绩
if ($code == 'admin') {
foreach ($arr as $key => $value) {
echo "<ul>
<li>姓名：$value[username]</li>
<li>语文：$value[chinaese]</li>
<li>数学：$value[math]</li>
<li>英语：$value[english]</li>
</ul>";
}
} else {
// 所输入学号的成绩
$score = $arr[$code];
echo "<ul>
<li>姓名：$score[username]</li>
<li>语文：$score[chinaese]</li>
<li>数学：$score[math]</li>
<li>英语：$score[english]</li>
</ul>";
}
?>
</div>
</body>
</html>
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