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分支与循环，PHP与HTML混编
新手1314
Original
541 people have browsed it

单分支

  1. $age = 18;
  2. if($age >=18){
  3.   echo '恭喜，你已成年，游戏时长不受限制';
  4. }
  5. //输出结果：恭喜。你已成年，游戏时长不受限制

双分支

  1. $age = 15;
  2. if($age >= 18){
  3.   echo '恭喜，你已成年，游戏时长不受限制';
  4. }else{
  5.    echo '你未成年，游戏时长为2小时';
  6. }
  7. //输出结果：你未成年，游戏时长为2小时

多分支

  1. $age = 20;
  2. if($age >= 18 && $age <30){
  3.  echo $age.'岁,游戏时长没限制';
  4. }else if( $age >= 30 && $age < 45){
  5.  echo $age.'岁，少玩点游戏';
  6. }else if($age>=45){
  7.  echo $age.'岁，别玩游戏了，出去走走吧';
  8. }else{
  9.  echo $age.'岁，别玩游戏，多陪陪家人';
  10. }
  11. //输出结果：20岁，游戏不受限制

多分支语法糖：switch

  1. $age = 15;
  2. switch(true){
  3.    case $age >= 18 && $age <30:
  4.      echo $age.'岁,游戏时长没限制';
  5.      break;
  6.    case $age >= 30 && $age < 45:
  7.      echo $age.'岁，少玩点游戏';
  8.      break;
  9.    case $age>=45:
  10.      echo  $age.'岁，别玩游戏了，出去走走吧';
  11.      break;
  12.    default:
  13.      echo $age.'岁，别玩游戏，多陪陪家人';
  14. }
  15. //输出结果：15岁，别玩游戏，陪陪家人

循环：while，将数组输出成列表

  1. $colors = ['red','green','blue'];
  2. $list = '<ul style="border:1px solid;background:lightcyan">';
  3. $i = 0;
  4. while($i<count($colors)){
  5.   $list .= '<li>{$colors[$i]}</li>';
  6.   $i =$i + 1;
  7. }
  8. $list .= </ul>;
  9. echo $list;

循环：do while

  1. $colors = ['red','green','blue'];
  2. $list = '<ul style="border:1px solid;background:lightcyan">';
  3. $i = 0;
  4. do{
  5.   $list .= '<li>{$colors[$i]}</li>';
  6.   $i =$i + 1;
  7. }while($i<count($colors));
  8. $list .= </ul>;
  9. echo $list;

循环：for

  1. $colors = ['red','green','blue'];
  2. $list = '<ul style="border:1px solid;background:violet">';
  3. for($i = 0 ; $i< count($colors);$i++){
  4.  $list .= "<li>{$colors[$i]}</li>";
  5. }
  6. $list .= </ul>;
  7. echo $list;

PHP与HTML混编

  1. <?php
  2. $stus = [
  3.     ['id' => 1, 'name' => '刘备', 'course' => 'js', 'score' => 83],
  4.     ['id' => 2, 'name' => '关羽', 'course' => 'php', 'score' => 75],
  5.     ['id' => 3, 'name' => '张飞', 'course' => 'js', 'score' => 52],
  6.     ['id' => 4, 'name' => '孙权', 'course' => 'php', 'score' => 88],
  7.     ['id' => 5, 'name' => '周瑜', 'course' => 'js', 'score' => 65],
  8.     ['id' => 6, 'name' => '孔明', 'course' => 'php', 'score' => 53],
  9.     ['id' => 7, 'name' => '赵云', 'course' => 'js', 'score' => 63],
  10.     ['id' => 8, 'name' => '马超', 'course' => 'js', 'score' => 77],
  11.     ['id' => 9, 'name' => '姜维', 'course' => 'php', 'score' => 93],
  12.     ['id' => 10, 'name' => '黄忠', 'course' => 'js', 'score' => 81],
  13. ]
  14. ?>
  16. <!DOCTYPE html>
  17. <html lang="en">
  18. <head>
  19.     <meta charset="UTF-8">
  20.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  21.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  22.     <title>PHP与HTML混编</title>
  23.     <style>
  24.         table {
  25.             border-collapse: collapse;
  26.             width: 360px;
  27.             text-align: center;
  28.         }
  30.         table th,
  31.         table td {
  32.             border: 1px solid #000;
  33.             padding: 5px;
  34.         }
  36.         table caption {
  37.             font-size: 1.3em;
  38.         }
  40.         table thead {
  41.             background-color: lightcyan;
  42.         }
  44.         .active {
  45.             color: red;
  46.         }
  47.     </style>
  48. </head>
  49. <body>
  50.     <table>
  51.         <caption>学生成绩表</caption>
  52.         <thead>
  53.             <tr>
  54.                 <th>ID</th>
  55.                 <th>姓名</th>
  56.                 <th>课程</th>
  57.                 <th>成绩</th>
  58.             </tr>
  59.         </thead>
  60.         <tbody>
  61.             <?php
  62.             foreach($stus as $stu){
  63.                 // echo "<tr>";
  64.                 // echo "<td>{$stu['id']}</td>";
  65.                 // echo "<td>{$stu['name']}</td>";
  66.                 // echo "<td>{$stu['course']}</td>";
  67.                 // echo "<td>{$stu['score']}</td>";
  68.                 // heredoc, 写模板, 可以解析内部变量
  69.                 echo <<< STU
  70.                    <tr>
  71.                       <td>{$stu['id']}</td>
  72.                       <td>{$stu['name']}</td>
  73.                       <td>{$stu['course']}</td>
  74.                       <td>{$stu['score']}</td>
  75.                    </tr>
  76.                 STU;
  77.                 //!只查某种元素
  78.                 // if($stu['course']==='php'){
  79.                 //     echo <<< STU
  80.                 //     <tr>
  81.                 //         <td>{$stu['id']}</td>
  82.                 //         <td>{$stu['name']}</td>
  83.                 //         <td>{$stu['course']}</td>
  84.                 //         <td>{$stu['score']}</td>
  85.                 //     </tr>
  86.                 //     STU;
  87.                 // }
  89.             }
  90.             ?>
  91.         </tbody>
  92.     </table>
  93. </body>
  94. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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