流程控制与模板语法 - PHP学习

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1.流程控制

1.1 分支判断

<?php
namespace _0809;
$a = 10;
$b = 20;
// 1.单分支
echo "1.单分支: ";
if ($a < $b) {
    echo " $b 大于  $a <hr>";
}
// 2.双分支
echo "2.双分支: ";
$b = 5;
if ($a < $b) {
    echo " $b 大于  $a <hr>";
} else {
    echo " $b 小于  $a <hr>";
}
// 3.双分支语法糖：三元运算符
echo "3.双分支语法糖: 三元运算符 : ";
echo $a < $b ? " $b 大于  $a <hr>" : "$b 小于  $a <hr>";
// 4.多分支
echo "4.多分支: ";
$b = 10;
if ($a < $b) {
    echo " $b 大于  $a <hr>";
} elseif ($a > $b) {
    echo " $b 小于  $a <hr>";
} else {
    echo " $b 等于  $a <hr>";
}
// 5.多分支语法糖：switch
echo "5.多分支语法糖: switch : ";
switch (true) {
    case $a < $b:
        echo " $b 大于  $a <hr>";
        break;
    case $a > $b:
        echo " $b 小于  $a <hr>";
        break;
    default:
        echo " $b 等于  $a <hr>";
}

1.2 循环

<?php
namespace _0809;
$arr = ["张三", "男", "zhangsan@qq.com", "贵州安顺", 18];
// 1.for循环
echo '1.for: <br>';
for ($i = 0; $i < count($arr); $i++) {
    //不输出索引为1的值
    if ($i === 1) {
        continue;
    }
    echo $arr[$i] . '<br>';
}
// 2.foreach
echo '<hr>2.foreach: <br>';
foreach ($arr as $k => $v) {
    printf('key: %s => value: %s <br>', $k, $v);
}
// 3.while
echo '<hr>2.while: <br>';
$i = 0;
while ($i < count($arr)) {
    echo $arr[$i] . '<br>';
    $i++;
}

2.模板语法

foreach渲染

<!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>模板渲染</title>
    <style>
        table {
            border-collapse: collapse;
            /* width: 360px; */
            text-align: center;
            margin: auto;
        }
        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>
    <div class="app">
        <table>
            <caption>学生信息表</caption>
            <thead>
                <tr>
                    <th><input type="checkbox" name="" id=""></th>
                    <th>ID</th>
                    <th>姓名</th>
                    <th>性别</th>
                    <th>年龄</th>
                    <th>入学时间</th>
                    <th>课程</th>
                    <th>班级</th>
                    <th>地址</th>
                    <th>邮箱</th>
                </tr>
            </thead>
            <tbody>
                <?php
                $stuInfo = [
                    ['id' => 1, 'name' => "赵大", 'sex' => 0, 'age' => 18, 'studyDate' => '2022.9', 'major' => 'PHP', 'class' => '2201', 'address' => '贵州贵阳', 'email' => 'zhaoda@qq.com'],
                    ['id' => 2, 'name' => "王二", 'sex' => 0, 'age' => 18, 'studyDate' => '2022.9', 'major' => 'PHP', 'class' => '2201', 'address' => '贵州遵义', 'email' => 'wanger@qq.com'],
                    ['id' => 3, 'name' => "张三", 'sex' => 1, 'age' => 18, 'studyDate' => '2022.9', 'major' => 'PHP', 'class' => '2201', 'address' => '贵州六盘水', 'email' => 'zhangsan@qq.com'],
                    ['id' => 4, 'name' => "李四", 'sex' => 0, 'age' => 19, 'studyDate' => '2021.9', 'major' => 'Java', 'class' => '2101', 'address' => '贵州安顺', 'email' => 'lisi@qq.com'],
                    ['id' => 5, 'name' => "钱五", 'sex' => 1, 'age' => 19, 'studyDate' => '2021.9', 'major' => 'Python', 'class' => '2102', 'address' => '贵州毕节', 'email' => 'qianwu@qq.com'],
                    ['id' => 6, 'name' => "吕六", 'sex' => 1, 'age' => 20, 'studyDate' => '2021.9', 'major' => 'Python', 'class' => '2102', 'address' => '贵州铜仁', 'email' => 'lvliu@qq.com'],
                ];
                ?>
                <?php foreach ($stuInfo as $stu) : ?>
                    <tr>
                        <td><input type="checkbox" name="" id=""></td>
                        <td><?= $stu['id'] ?></td>
                        <td><?= $stu['name'] ?></td>
                        <!-- 0:女 1:男 -->
                        <td><?= $stu['sex'] ? '男' : '女' ?></td>
                        <td><?= $stu['age'] ?></td>
                        <td><?= $stu['studyDate'] ?></td>
                        <td><?= $stu['major'] ?></td>
                        <td><?= $stu['class'] ?></td>
                        <td><?= $stu['address'] ?></td>
                        <td><?= $stu['email'] ?></td>
                    </tr>
                <?php endforeach ?>
            </tbody>
        </table>
    </div>
</body>
</html>

switch渲染

<body>
    <form action="" method="POST">
        <label>请输入您的年龄：</label>
        <input type="number" name="text" id="">
        <input type="submit" value="确定" .name='sub'>
        <br>
        <br>
    </form>
    <?php
    if (empty($_POST['sub'])) {
        $age = $_POST['text'];
        switch (true) {
            case $age > 7 && $age <= 12:
                echo " <span>你现在是 $age 岁,应该在读小学！</span>";
                break;
            case $age > 12 && $age <= 18:
                echo " <span>你现在是 $age 岁,应该在读中学！</span>";
                break;
            case $age > 18 && $age <= 28:
                echo " <span>你现在是 $age 岁,应该在读大学或者研究生！</span>";
                break;
            case $age > 28 && $age <= 38:
                echo " <span>你现在是 $age 岁,应该结婚了,同时应该在还房贷了！</span>";
                break;
            case $age > 38 && $age <= 58:
                echo " <span>你现在是 $age 岁,房贷还完了，应该要操心你儿子的彩礼钱了和房贷了！</span>";
                break;
            case $age > 58 && $age <= 98:
                echo " <span>你现在是 $age 岁,儿子孝顺，天天打麻将，不孝顺天天骂儿子</span>";
                break;
            case $age > 100 || $age <= 0:
                echo " <span>$age 岁 是一个非法年龄</span>";
                break;
            default:
                echo " <span>你现在是 $age 岁,还是个宝宝";
        }
    }
    ?>
</body>

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