双色球
1 原理
- 红球: 33 选 6
- 蓝球: 16 选 1
- 取红球: 每取出一个后都要随机打乱,并且排序
- 取蓝球: 随机取出一个即可
- 中奖号: 6 个红球+1 个蓝球 = 7 个号球
- 页面: 用户只需要输入试机号数量即可
- 免费用户只能看 10 组, 更多得升级 VIP
2 数组函数
array_rand(): 随机取值,返回值的键名array_push(): 尾部追加成员array_splice(): 删除或替换成员sort(): 排序array_flip(): 键值交换array_merge(): 数组合并
3 代码示例:后端
<?php// 双色球类define('RED_BALLS', range(1, 33));define('BLUE_BALLS', range(1, 16));class DoubleColorBall{ //红球 private static $redBalls = RED_BALLS; //篮球 private static $blueBalls = BLUE_BALLS; //选中红球 private static $electRedBalls = []; //选中篮球 private static $electBlueBalls = []; //保存试机号 private static $testNos = []; //从33个红球中选中6个红球 private static function createRedBalls() { //循环拿红球 for ($i = 0; $i < 6; $i++) { //1.随机取一个数，返回一个key $key = array_rand(self::$redBalls); //2.将这个球放入红球数组中 array_push(self::$electRedBalls, self::$redBalls[$key]); //3.将选中的红球从33个红球中剔除 array_splice(self::$redBalls, $key, 1); } //排序输出 sort(self::$electRedBalls, SORT_NUMERIC); } //从16个篮球中选中1个篮球 private static function createBlueBalls() { self::$electBlueBalls = array_rand(array_flip(self::$blueBalls)); // print_r(self::$electBlueBalls); } //生成试机号 private static function createTestNos($n=5) { for ($i = 0; $i < $n; $i++) { self::$redBalls = RED_BALLS; self::$blueBalls = BLUE_BALLS; self::$electRedBalls = []; self::$electBlueBalls = null; //生成红球 self::createRedBalls(); //生成篮球 self::createBlueBalls(); //合并红蓝球成为一个中奖机号 self::$testNos[] = array_merge(self::$electRedBalls, [self::$electBlueBalls]); } } //获取试机号,供外部调用 public static function getTestNos($n) { self::createTestNos($n); return self::$testNos; }}// DoubleColorBall::createRedBalls();// DoubleColorBall::createBlueBalls();// print_r(DoubleColorBall::getTestNos(2));// print_r(DoubleColorBall::$testNos);$result = DoubleColorBall::getTestNos(5);echo json_encode($result);
代码示例：前端
<?phprequire __DIR__ . '/demo1.php';// $n = isset($_GET['n']) ? $_GET['n'] : 5;//null 合并运算符$n = $_GET['n'] ?? 5;$allBalls = DoubleColorBall::getTestNos($n);?><!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>生成双色球中奖试机号</title> <link rel="stylesheet" href="style.css"></head><body> <div class="lottery"> <h2>双色球试机号</h2> <form action=""> <input type="number" name="n" value="<?= $n ?>" onchange="isVip(this)"> <button>生成试机号</button> </form> <table> <tbody> <?php foreach ($allBalls as $key => $balls) : ?> <tr> <td><?= $key + 1 ?></td> <?php foreach ($balls as $ball) : ?> <td><?= $ball ?></td> <?php endforeach ?> </tr> <?php endforeach ?> </tbody> </table> </div> <script> function isVip(input){ if(input.value > 10){ alert('免费用户只能看10个,更多请升级VIP!'); input.max = 10; input.value = 10; location.reload(true); return false; } } </script></body></html>
代码示例：异步接口
<!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>Document</title></head><body> <button onclick="getData()">获取数据</button> <script> async function getData(){ const response = await fetch('demo1.php') const data = await response.json() console.log(data) } </script></body></html>
