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分支，循环，流程控制
P粉036614676
Original
271 people have browsed it
  1. 实例演示分支与循环, 不要抄源码 2. 实例演示流程控制之模板语法, 自己测试switch

    1.分支

    1.1分支

    1. if($count > 0)
    2. {
    3.  if($count == 1)
    4.  {
    5.      echo '1' . PHP_EOL;
    6.  }
    7.  elseif ($count == 2)
    8.  {
    9.      echo '2' . PHP_EOL;
    10.  }
    11.  else
    12.  {
    13.      echo '3' . PHP_EOL;
    14.  }
    15. }

    1.2语法糖

    目标：判断大人小孩
    1. $age = 20;
    2. $person = $age > 18 ? '大人' : '小孩';
    3. echo $person . PHP_EOL;

2.循环

2.1switch循环

目标：判断是否及格

  1. $m = 100;
  2. switch ($m)
  3. {
  4.     case $m<60:
  5.         echo '不及格';
  6.         break;
  7.     default:
  8.         echo '及格';
  9. }

2.2 while循环

目标：输出0-9

  1. $y = 10;
  2. do{
  3.     echo $GLOBALS['y'];
  4.     static $count = 0;
  5.     echo $count . " ";
  6.     $count++;
  7. }while($count < 10);

2.3 for循环

目标：屏幕上输出颜色

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

2.4 foreach循环

目标：遍历数组

  1. $person = ['name' => 'yk','wight' => 60];
  2. echo $person;
  4. foreach ($person as $key => $value)
  5. {
  6.     echo $key . ' ' . $value;
  7. }

3.模板语法

3.1普通写法

  1. <?php
  2. $users = [
  3.     ['1','吴昊','0',22],
  4.     ['2','吴啊','1',23],
  5.     ['3','爱昊','0',25],
  6. ]
  7. ?>
  8. <!DOCTYPE html>
  9. <html lang="en">
  10. <head>
  11.     <meta charset="UTF-8">
  12. </head>
  13. <style>
  14.     th,td{
  15.         border: 1px solid gray;
  16.         margin: 0;
  17.     }
  18. </style>
  19. <body>
  20. <table style="border: 1px solid green;">
  21.     <caption>学生体检表</caption>
  22.     <thead>
  23.     <tr>
  24.         <th>ID</th>
  25.         <th>姓名</th>
  26.         <th>性别</th>
  27.         <th>年龄</th>
  28.     </tr>
  29.     </thead>
  30.     <tbody>
  31.     <?php
  32.     foreach ($users as $user)
  33.     {
  34.         echo '<tr>';
  35.         echo "<td>$user[0]</td>";
  36.         echo "<td>$user[1]</td>";
  37.         $sex = $user[2] ? '男' : '女';
  38.         echo '<td>'. $sex .'</td>';
  39.         echo "<td>$user[3]</td>";
  40.         echo '</tr>';
  41.     }
  42.     ?>
  43.     </tbody>
  44. </table>
  45. </body>
  46. </html>

3.2模板写法

  1. <?php
  2. $users = [
  3.     ['1','吴昊','0',22],
  4.     ['2','吴啊','1',23],
  5.     ['3','爱昊','0',25],
  6. ]
  7. ?>
  8. <!DOCTYPE html>
  9. <html lang="en">
  10. <head>
  11.     <meta charset="UTF-8">
  12. </head>
  13. <style>
  14.     th,td{
  15.         border: 1px solid gray;
  16.         margin: 0;
  17.     }
  18. </style>
  19. <body>
  20. <table style="border: 1px solid green;">
  21.     <caption>学生体检表</caption>
  22.     <thead>
  23.     <tr>
  24.         <th>ID</th>
  25.         <th>姓名</th>
  26.         <th>性别</th>
  27.         <th>年龄</th>
  28.     </tr>
  29.     </thead>
  30.     <tbody>
  31.     <?php
  32.     foreach ($users as $user):
  33.      ?>
  34.          <tr>
  35.          <td><?=$user[0]?></td>
  36.          <td><?=$user[1]?></td>
  37.         <?php
  38.         $sex = $user[2] ? '男' : '女';
  39.         ?>
  40.          <td><?=$sex?></td>
  41.          <td><?=$user[3]?></td>
  42.          </tr> 
  43.     <?php
  44.     endforeach;
  45.     ?>
  46.     </tbody>
  47. </table>
  48. </body>
  49. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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