分支与循环

// 单分支
$age = 19;
if($age >= 18){
    echo '满18岁,已成年'. '<br>';
}
// 双分支
$age = 12;
if($age >= 18){
    echo '满18岁,你已成年<br>';
} else{
    echo '你未成年,请家长陪同<br>';
}
// 双分支语法糖: 三元运算符
echo $age >=18 ? "满18岁,你已成年" : "你未成年,请家长陪同";
echo '<br>';
// 多分支
$age = 49;
if ($age < 18){
    echo '你还是努力上学吧<br>';
} elseif ($age = 18){
    echo '买房的钱存够了吗<br>';
} elseif ($age > 50){
    echo '房贷供完了吗';
}
// 多分支语法糖 switch
$age = 61;
switch(true){
    case $age > 12 && $age <=24;
        echo '还在上学奋斗中';
    break;
    case $age > 25 && $age <=40;
        echo '还在苦逼打工';
    break;
    case $age > 41 && $age <=65;
        echo '在公司养老中';
    break;
    case $age > 66 && $age <=80;
        echo '退休中';
    break;
}

模板语法

namespace _0809;
// 用二维数组来模拟数据表查询结果
$stus = [
    ['id' => 1, 'name' => '张三', 'gender' => '男', 'score' => 83],
    ['id' => 2, 'name' => '李四', 'gender' => '女', 'score' => 66],
    ['id' => 3, 'name' => '刘五', 'gender' => '男', 'score' => 42],
    ['id' => 4, 'name' => '钱六', 'gender' => '女', 'score' => 90],
    ['id' => 5, 'name' => '陈七', 'gender' => '男', 'score' => 55],
    ['id' => 6, 'name' => '赵八', 'gender' => '女', 'score' => 45],
    ['id' => 7, 'name' => '马九', 'gender' => '男', 'score' => 75],
    ['id' => 8, 'name' => '陆十', 'gender' => '男', 'score' => 88],
]
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>学生信息表</title>
    <style>
        table {
            border-collapse: collapse;
            width: 360px;
            text-align: center;
        }
        table th,
        table td {
            border: 1px solid #000;
            padding: 5px;
        }
        table caption {
            font-size: 1.3em;
        }
        table thead {
            background-color: lightcyan;
        }
        .active {
            color: red;
        }
    </style>
</head>
<body>
    <table>
        <thead>
            <tr>
                <th>ID</th>
                <th>姓名</th>
                <th>性别</th>
                <th>成绩</th>
            </tr>
        </thead>
    <tbody>
        <?php foreach($stus as $stu): ?>
        <tr>
            <td><?=$stu['id']?></td>
            <td><?=$stu['name']?></td>
            <td><?=$stu['gender']?></td>
            <td><?=$stu['score']?></td>
        </tr>
        <?php endforeach ?>
    </tbody>
    </table>
</body>
</html>

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：

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分支与循环

模板语法