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大乐透与分页边界处理
手机用户1580651468
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大乐透与分页边界处理

一. 大乐透的实战

一）选球代码

  1. <?php
  2. // 大乐透球类
  3. define('RED_BALLS', range(1, 35));
  4. define('BLUE_BALLS', range(1, 12));
  6. class DoubleColorBall
  7. {
  8.     // 红球
  9.     private static $redBalls = RED_BALLS;
  10.     // 蓝球
  11.     private static $blueBalls = BLUE_BALLS;
  12.     // 红球中奖号: 5/35
  13.     private static $electRedBalls = [];
  14.     // 蓝球中奖号: 2/12
  15.     private static $electBlueBalls = [];
  16.     // 保存试机号
  17.     public static $testNos = [];
  18.     // 从33个红球中取出5个红球
  19.     private static function createRedBalls()
  20.     {
  21.         // 1. 35选5
  22.         for ($i = 0; $i < 5; $i++) {
  23.             // 1. 随机取1个,返回一个key
  24.             $key = array_rand(self::$redBalls);
  25.             // 2. 将这个球添加到红球数组中
  26.             array_push(self::$electRedBalls, self::$redBalls[$key]);
  27.             // 3. 将选出的红球从原始的33个红球中删除,剩下的再次随机抽取
  28.             array_splice(self::$redBalls, $key, 1);
  29.         }
  30.         // 2. 排序输出
  31.         sort(self::$electRedBalls, SORT_NUMERIC);
  32.     }
  33.     // 从12个蓝球中取出2个蓝球
  34.     private static function createBlueBall()
  35.     { // 1. 35选5
  36.         for ($i = 0; $i < 2; $i++) {
  37.             // 1. 随机取1个,返回一个key
  38.             $key = array_rand(self::$blueBalls);
  39.             // 2. 将这个球添加到球数组中
  40.             array_push(self::$electBlueBalls, self::$blueBalls[$key]);
  41.             // 3. 将选出的红球从原始的12个红球中删除,剩下的再次随机抽取
  42.             array_splice(self::$blueBalls, $key, 1);
  43.         }
  44.         // 2. 排序输出
  45.         sort(self::$electBlueBalls, SORT_NUMERIC);
  46.     }
  47.     // 生成试机号
  48.     private  static function createTestNos($n = 5)
  49.     {
  50.         for ($i = 0; $i < $n; $i++) {
  51.             self::$redBalls = RED_BALLS;
  52.             self::$blueBalls = BLUE_BALLS;
  53.             self::$electRedBalls = [];
  54.             self::$electBlueBalls = [];
  55.             // 生成红球
  56.             self::createRedBalls();
  57.             // 生成蓝球
  58.             self::createBlueBall();
  59.             // 红蓝球合并生成一个中奖试机号
  60.             self::$testNos[] =  array_merge(self::$electRedBalls, self::$electBlueBalls);
  61.         }
  62.     }
  63.     // 获取试机号,供外部调用(外部只需要访问它,也就是只有它是公开的)
  64.     public static function getTestNos($n = 5)
  65.     {self::createTestNos($n);
  66.      return self::$testNos;
  67.     }
  68. }

二）展示html代码

  1. <?php
  2. require __DIR__ . '/Lotto.php';
  3. // 生成数量应该从当前URL中获取
  4. // $n = isset($_GET['n']) ? $_GET['n'] : 5;
  5. // null合并运算符
  6. $n = $_GET['n'] ?? 5;
  7. // print_r($n);
  8. $allBalls=DoubleColorBall::getTestNos($n);
  9. // print_r(DoubleColorBall::$testNos);
  10. ?>
  11. <!DOCTYPE html>
  12. <html lang="zh-CN">
  14. <head>
  15.     <meta charset="UTF-8" />
  16.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  17.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  18.     <title>生成大乐透中奖试机号</title>
  19.     <link rel="stylesheet" href="style.css" />
  20. </head>
  21. <body>
  22.     <div class="lottery">
  23.         <h2>大乐透试机号</h2>
  24.         <form>
  25.             <input type="number" name="n" min="1" value="<?=$_GET['n'] ?? 5?>" onchange="isVip(this)">
  26.             <button>生成试机号</button>
  27.         </form> <table><tbody>
  28.       <?php foreach ($allBalls as $key=> $balls): ?>
  29.                 <tr>
  30.       <!-- 第一列是序号: 默认从1开始 $key+1 -->
  31.                     <td><?=$key+1?></td>
  32.                     <?php foreach ($balls as $ball) : ?>
  33.                     <td><?=$ball?></td>
  34.                     <?php endforeach; ?>
  35.                 </tr>
  36.                 <?php endforeach ?>
  37.             </tbody>
  38.         </table>
  39.         <p>福利彩票大家买,众手托起幸福来</p>
  40.     </div>
  41.     <script>
  42.     function isVip(input) {
  43.         if (input.value > 10) {
  44.             alert('免费用户只能看10个,看更多升级到VIP,现在升级8折');
  45.             input.value = 10;
  46.             input.max = 10;
  47.             location.reload(true);
  48.             return false;
  49.         }
  50.     }
  51.     </script>
  52. </body>
  53. </html>

三）做好的效果图

二. 为分页添加”上一页”,”下一页”功能，边界处理

一）边界处理的关键代码

  1.     <p>
  2.    <?php
  3.     //上一页的小于0的判断
  4.  $pages1 = ($page - 1 > 0) ? ($page - 1) : 1;
  5. $pages2 = $_SERVER['PHP_SELF'] . '?page='.$pages1;
  6.    ?>
  7.    //
  8.   <a href="<?= $pages2  ?>">上一页</a>
  9.  //
  10. <?php for ($i = 1; $i <= $pages; $i++) : ?>
  11.  <?php $url =  $_SERVER['PHP_SELF'] . '?page='. $i;
  12.    $style = 'style="background:red"';
  13. // $i 是当前的页码, $_GET['page']相同时才是要高亮的页码
  14.  $active = ($i == @$_GET['page']) ? $style : null;
  15.    ?> <a href="<?= $url ?>" <?= $active ?>><?= $i ?></a> <?php endfor ?>
  16. //
  17. <!-- 下一页的超出页码的判断 -->
  18.  <?php
  19. $pages3=($page + 1 < $pages)?($page + 1):$pages;
  20. $pages4 = $_SERVER['PHP_SELF'] . '?page=' .$pages3;
  21.   ?>
  22.   <a href="<?= $pages4 ?>">下一页</a></p>

二）处理后的效果图

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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