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博客列表 >流程控制与模板语法

流程控制与模板语法

吴长清
吴长清原创
2022年08月10日 10:52:31372浏览

1.流程控制

1.1 分支判断

  1. <?php
  3. namespace _0809;
  5. $a = 10;
  6. $b = 20;
  8. // 1.单分支
  9. echo "1.单分支: ";
  10. if ($a < $b) {
  11.     echo " $b 大于  $a <hr>";
  12. }
  14. // 2.双分支
  15. echo "2.双分支: ";
  16. $b = 5;
  17. if ($a < $b) {
  18.     echo " $b 大于  $a <hr>";
  19. } else {
  20.     echo " $b 小于  $a <hr>";
  21. }
  23. // 3.双分支语法糖：三元运算符
  24. echo "3.双分支语法糖: 三元运算符 : ";
  25. echo $a < $b ? " $b 大于  $a <hr>" : "$b 小于  $a <hr>";
  27. // 4.多分支
  28. echo "4.多分支: ";
  29. $b = 10;
  30. if ($a < $b) {
  31.     echo " $b 大于  $a <hr>";
  32. } elseif ($a > $b) {
  33.     echo " $b 小于  $a <hr>";
  34. } else {
  35.     echo " $b 等于  $a <hr>";
  36. }
  38. // 5.多分支语法糖：switch
  39. echo "5.多分支语法糖: switch : ";
  40. switch (true) {
  41.     case $a < $b:
  42.         echo " $b 大于  $a <hr>";
  43.         break;
  44.     case $a > $b:
  45.         echo " $b 小于  $a <hr>";
  46.         break;
  47.     default:
  48.         echo " $b 等于  $a <hr>";
  49. }

1.2 循环

  1. <?php
  3. namespace _0809;
  5. $arr = ["张三", "男", "zhangsan@qq.com", "贵州安顺", 18];
  7. // 1.for循环
  8. echo '1.for: <br>';
  9. for ($i = 0; $i < count($arr); $i++) {
  10.     //不输出索引为1的值
  11.     if ($i === 1) {
  12.         continue;
  13.     }
  14.     echo $arr[$i] . '<br>';
  15. }
  16. // 2.foreach
  17. echo '<hr>2.foreach: <br>';
  18. foreach ($arr as $k => $v) {
  19.     printf('key: %s => value: %s <br>', $k, $v);
  20. }
  22. // 3.while
  23. echo '<hr>2.while: <br>';
  24. $i = 0;
  25. while ($i < count($arr)) {
  27.     echo $arr[$i] . '<br>';
  28.     $i++;
  29. }

2.模板语法

foreach渲染

  1. <!DOCTYPE html>
  2. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  7.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  8.     <title>模板渲染</title>
  9.     <style>
  10.         table {
  11.             border-collapse: collapse;
  12.             /* width: 360px; */
  13.             text-align: center;
  14.             margin: auto;
  15.         }
  17.         table th,
  18.         table td {
  19.             border: 1px solid #000;
  20.             padding: 5px;
  21.         }
  23.         table caption {
  24.             font-size: 1.3em;
  25.         }
  27.         table thead {
  28.             background-color: lightcyan;
  29.         }
  31.         .active {
  32.             color: red;
  33.         }
  34.     </style>
  35. </head>
  37. <body>
  38.     <div class="app">
  39.         <table>
  40.             <caption>学生信息表</caption>
  41.             <thead>
  42.                 <tr>
  43.                     <th><input type="checkbox" name="" id=""></th>
  44.                     <th>ID</th>
  45.                     <th>姓名</th>
  46.                     <th>性别</th>
  47.                     <th>年龄</th>
  48.                     <th>入学时间</th>
  49.                     <th>课程</th>
  50.                     <th>班级</th>
  51.                     <th>地址</th>
  52.                     <th>邮箱</th>
  53.                 </tr>
  54.             </thead>
  56.             <tbody>
  57.                 <?php
  58.                 $stuInfo = [
  59.                     ['id' => 1, 'name' => "赵大", 'sex' => 0, 'age' => 18, 'studyDate' => '2022.9', 'major' => 'PHP', 'class' => '2201', 'address' => '贵州贵阳', 'email' => 'zhaoda@qq.com'],
  60.                     ['id' => 2, 'name' => "王二", 'sex' => 0, 'age' => 18, 'studyDate' => '2022.9', 'major' => 'PHP', 'class' => '2201', 'address' => '贵州遵义', 'email' => 'wanger@qq.com'],
  61.                     ['id' => 3, 'name' => "张三", 'sex' => 1, 'age' => 18, 'studyDate' => '2022.9', 'major' => 'PHP', 'class' => '2201', 'address' => '贵州六盘水', 'email' => 'zhangsan@qq.com'],
  62.                     ['id' => 4, 'name' => "李四", 'sex' => 0, 'age' => 19, 'studyDate' => '2021.9', 'major' => 'Java', 'class' => '2101', 'address' => '贵州安顺', 'email' => 'lisi@qq.com'],
  63.                     ['id' => 5, 'name' => "钱五", 'sex' => 1, 'age' => 19, 'studyDate' => '2021.9', 'major' => 'Python', 'class' => '2102', 'address' => '贵州毕节', 'email' => 'qianwu@qq.com'],
  64.                     ['id' => 6, 'name' => "吕六", 'sex' => 1, 'age' => 20, 'studyDate' => '2021.9', 'major' => 'Python', 'class' => '2102', 'address' => '贵州铜仁', 'email' => 'lvliu@qq.com'],
  65.                 ];
  66.                 ?>
  67.                 <?php foreach ($stuInfo as $stu) : ?>
  68.                     <tr>
  69.                         <td><input type="checkbox" name="" id=""></td>
  70.                         <td><?= $stu['id'] ?></td>
  71.                         <td><?= $stu['name'] ?></td>
  72.                         <!-- 0:女 1:男 -->
  73.                         <td><?= $stu['sex'] ? '男' : '女' ?></td>
  74.                         <td><?= $stu['age'] ?></td>
  75.                         <td><?= $stu['studyDate'] ?></td>
  76.                         <td><?= $stu['major'] ?></td>
  77.                         <td><?= $stu['class'] ?></td>
  78.                         <td><?= $stu['address'] ?></td>
  79.                         <td><?= $stu['email'] ?></td>
  80.                     </tr>
  81.                 <?php endforeach ?>
  82.             </tbody>
  83.         </table>
  84.     </div>
  85. </body>
  87. </html>

switch渲染

  1. <body>
  2.     <form action="" method="POST">
  3.         <label>请输入您的年龄：</label>
  4.         <input type="number" name="text" id="">
  5.         <input type="submit" value="确定" .name='sub'>
  6.         <br>
  7.         <br>
  8.     </form>
  9.     <?php
  10.     if (empty($_POST['sub'])) {
  11.         $age = $_POST['text'];
  12.         switch (true) {
  13.             case $age > 7 && $age <= 12:
  14.                 echo " <span>你现在是 $age 岁,应该在读小学！</span>";
  15.                 break;
  16.             case $age > 12 && $age <= 18:
  17.                 echo " <span>你现在是 $age 岁,应该在读中学！</span>";
  18.                 break;
  19.             case $age > 18 && $age <= 28:
  20.                 echo " <span>你现在是 $age 岁,应该在读大学或者研究生！</span>";
  21.                 break;
  22.             case $age > 28 && $age <= 38:
  23.                 echo " <span>你现在是 $age 岁,应该结婚了,同时应该在还房贷了！</span>";
  24.                 break;
  25.             case $age > 38 && $age <= 58:
  26.                 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>";
  27.                 break;
  28.             case $age > 58 && $age <= 98:
  29.                 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>";
  30.                 break;
  31.             case $age > 100 || $age <= 0:
  32.                 echo " <span>$age 岁 是一个非法年龄</span>";
  33.                 break;
  34.             default:
  35.                 echo " <span>你现在是 $age 岁,还是个宝宝";
  36.         }
  37.     }
  38.     ?>
  39. </body>

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