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composer的自动加载（0807）
丶久而旧之丶
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composer自动加载

1.传统加载

  1. <?php
  2. // 加载文件
  3. require 'app/controller/User.php';
  5. // 注册类别名(没有注册的话那么就需要写命名空间或者调用时使用命名空间调用)
  6. use app\controller\User;
  8. // 调用类成员
  9. echo User::get();

2.自动加载器

  1. <?php
  2. // 使用内置函数加载
  3. spl_autoload_register(function ($class) {
  4. // 把命名空间分隔符换成目录分隔符
  5. $path = str_replace('\\', DIRECTORY_SEPARATOR, $class);
  6. // 获取文件路径
  7.     $file = __DIR__ . '/' . $path . '.php';
  8.     require $file;
  9. });
  10. // 注册类别名
  11. use app\controller\User;
  13. // 调用类成员
  14. echo User::get();

3.composer加载

  1. <?php
  2. // 先创建一个composer.json文件并生成vendor
  3. require __DIR__ . '/vendor/autoload.php';
  5. // 注册类别名
  6. use app\controller\User;
  7. use php\Order;
  8. use php\Show;
  10. // 调用类成员
  11. echo User::get() . '<hr>' . Order::get() . '<hr>' . Show::get();

类映射加载

psr-4方式加载

使用组件

  1. <?php
  2. // 加载组件
  3. require_once __DIR__ . '/vendor/autoload.php';
  5. // 注册类别名
  6. use Gregwar\Captcha\CaptchaBuilder;
  8. // 创建类实例
  9. $captcha = new CaptchaBuilder;
  10. $captcha->build();
  11. // 获取验证码
  12. $a = $captcha->getPhrase();
  13. echo '验证码是：' . $a;
  14. ?>
  15. <!DOCTYPE html>
  16. <html lang="en">
  18. <head>
  19.     <meta charset="UTF-8">
  20.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  21.     <title>验证码演示</title>
  22. </head>
  24. <body>
  25.     <h3>用户登录</h3>
  26.     <div>
  27.         <label for="email">邮箱：</label>
  28.         <input type="email" id="email">
  29.     </div>
  30.     <div>
  31.         <label for="password">密码：</label>
  32.         <input type="password" id="password">
  33.     </div>
  34.     <div>
  35.         <label for="yan">验证：</label>
  36.         <input type="txt" id="yan">
  37.         <img src="<?php echo $captcha->inline(); ?>" width='80px' onclick="location.reload()">
  38.     </div>
  39.     <div>
  40.         <button>登录</button>
  41.     </div>
  42. </body>
  44. </html>

写一个小框架

安装相应组件

  • 模型类：composer require catfan/medoo
  • 视图类：composer require league/plates

1.创建自己框架的核心代码分别继承第三方的组件

  1. <?php
  3. namespace core;
  5. use Medoo\Medoo;
  7. // 模型类（继承medoo）
  8. class Model extends Medoo
  9. {
  11.     public function __construct()
  12.     {
  13.         $options = [
  14.             'database_type' => 'mysql',
  15.             'database_name' => 'User',
  16.             'server' => 'localhost',
  17.             'username' => 'root',
  18.             'password' => 'root'
  19.         ];
  20.         parent::__construct($options);
  21.     }
  22. }
  1. <?php
  3. namespace core;
  5. use League\Plates\Engine;
  7. // 视图类（继承plates）
  8. class View extends Engine
  9. {
  10.     public $templates;
  11.     public function __construct($path)
  12.     {
  13.         $this->templates = parent::__construct($path);
  14.     }
  15. }

2.创建自己的应用，创建属于这个应用的model，view，controller

  1. <?php
  3. namespace Models;
  5. use core\Model;
  7. // 自定义模型
  8. class AppleModel extends Model
  9. {
  10.     public function __construct()
  11.     {
  12.         parent::__construct();
  13.     }
  14. }
  1. // 自定义视图
  2. <!DOCTYPE html>
  3. <html lang="en">
  5. <head>
  6.     <meta charset="UTF-8">
  7.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  8.     <title>用户信息</title>
  9.     <style>
  10.         table {
  11.             border: 1px solid black;
  12.             border-collapse: collapse;
  13.             width: 40%;
  14.             margin: auto;
  15.             text-align: center;
  16.         }
  18.         caption {
  19.             font-size: 1.5rem;
  20.             margin-top: 10px;
  21.             margin-bottom: 20px;
  22.         }
  24.         th,
  25.         td {
  26.             border: 1px solid black;
  27.         }
  29.         tr:first-of-type {
  30.             background-color: lightblue;
  31.         }
  32.     </style>
  33. </head>
  35. <body>
  36.     <table>
  37.         <caption>用户信息</caption>
  38.         <tr>
  39.             <th>ID</th>
  40.             <th>用户名</th>
  41.             <th>性别</th>
  42.         </tr>
  43.         <?php foreach ($users as $user) : ?>
  44.             <tr>
  45.                 <td><?= $this->e($user['id']) ?></td>
  46.                 <td><?= $this->e($user['username']) ?></td>
  47.                 <td><?= $this->e($user['sex']) ?></td>
  48.             </tr>
  49.         <?php endforeach ?>
  50.     </table>
  51. </body>
  53. </html>
  1. <?php
  2. // 自定义控制器
  3. namespace Controller;
  5. class UserController
  6. {
  7.     public $model;
  8.     public $view;
  9.     public function __construct($model, $view)
  10.     {
  11.         $this->model = $model;
  12.         $this->view = $view;
  13.     }
  14.     // 用于测试
  15.     public function get()
  16.     {
  17.         return 'PHP中文网';
  18.     }
  19.     public function select()
  20.     {
  21.         // 获取数据
  22.         $users = $this->model->select('apple', ['id', 'username', 'sex'], ['id[>=]' => 10, 'LIMIT' => 10]);
  23.         // 渲染数据(数据到模板引擎中)
  24.         return $this->view->render('User/list', ['users' => $users]);
  25.     }
  26. }

3.更新composer.json文件中的类映射关系

  1. {
  2.     "require": {
  3.         "catfan/medoo": "^1.7",
  4.         "league/plates": "^3.3"
  5.     },
  6.     "autoload":{
  7.         "psr-4":{
  8.             "core\\":"core",
  9.             "Models\\":"app/Models",
  10.             "Views\\":"app/Views",
  11.             "Controller\\":"app/Controllers"
  12.         }
  13.     }
  14. }

4.创建入口文件，使用composer加载器

  1. <?php
  2. require __DIR__ . "/vendor/autoload.php";
  4. use Models\AppleModel;
  5. use core\View;
  6. use Controller\UserController;
  8. // 测试模型
  9. $model = new AppleModel();
  10. // var_dump($model);
  11. // echo '<hr>';
  12. // 测试视图
  13. $view = new View('app/Views');
  14. // var_dump($view);
  15. // echo '<hr>';
  16. // 测试控制器
  17. $controller = new UserController($model, $view);
  18. // var_dump($controller);
  19. echo $controller->select();

总结

1.了解了composer的自动加载
2.框架的书写大概了解了，对于各组件的使用还需多看手册了解其功能

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：非常好, 理解流程很重要
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