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MVC框架流程中服务容器和门面的应用-PHP培训十期线上班
手机用户1576673622
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在php程序设计中，应避免类严重依赖外部对象,降低”代码耦合”, 同时要”共享”依赖的外部对象，不仅如此，还应该降低程序的复杂性,使程序更加容易被访问。通过”注入依赖”、”对象共享”、”服务容器”、”Facade门面技术”等方法的使用,可以实现上述的要求。下面通过一个功能相对完整的MVC的操作来演示。

Model类
  2. <?php
  3. //文件src\MVC\Model.php
  5. namespace src\MVC;
  7. class Model
  8. {
  10.     private $connect;
  12.     public function __construct()
  13.     {
  14.         $this->connect = new \PDO('mysql:host=localhost;dbname=phpedu', 'root', 'root');
  15.     }
  17.     public function getData(): array
  18.     {
  19.         return $this->connect->query("SELECT * FROM `{$this->table}`")->fetchAll(\PDO::FETCH_ASSOC);
  20.     }
  22.     public function __set(string $name, $val)
  23.     {
  24.         $this->{$name} = $val;
  25.     }
  27.     //查看某个字段的属性
  28.     public function getFildsInfo(\Closure $callback = NULL)
  29.     {
  31.         $stmt = $this->connect->query("SHOW full fields FROM `{$this->table}` " . (($this->fieldsnm) ? " where field='{$this->fieldsnm}';" : NULL));
  32.         $fetch = $stmt->fetchAll(\PDO::FETCH_ASSOC);
  34.         if (!isset($this->property)) {
  35.             return $fetch[0];
  36.         }
  38.         $res = $fetch[0][$this->property];
  40.         if (!$callback) {
  41.             return $res;
  42.         } else {
  43.             return call_user_func_array($callback, [$res]);
  44.         }
  45.     }
  47.     //将备注属性进行替换,备注用query_string的格式书写"性别?0=男&1=女"
  48.     public function getProperty($name = NULL)
  49.     {
  50.         return $this->getFildsInfo(function ($str) use ($name) {
  52.             $info = \parse_url($str);
  54.             //如果没有query
  55.             if ($name === NULL) return $info['path'];
  57.             //如果有query
  58.             if (isset($info['query'])) {
  59.                 \parse_str($info['query'], $params);
  60.                 return $params[$name];
  61.             }
  62.         });
  63.     }
  64. }
View类
  1. <?php
  2. //文件src\MVC\View.php
  4. namespace src\MVC;
  6. class View
  7. {
  8.     private $model;
  10.     public function __construct(Model $model)
  11.     {
  12.         $this->model = $model;
  13.     }
  15.     public function __set(string $name, $val)
  16.     {
  17.         $this->{$name} = $val;
  18.     }
  20.     public function fetch()
  21.     {
  22.         //处理表头
  23.         $replacestr = function ($fieldsnm, $property, $value = NULL) {
  24.             $this->model->fieldsnm = $fieldsnm;
  25.             $this->model->property = $property;
  26.             $res = $this->model->getProperty($value);
  27.             return (strlen(str_replace(' ', '', $res)) === 0) ? $fieldsnm : $res;
  28.         };
  30.         $fieldsPro = function ($fieldValue, $field) {
  31.             //处理时间戳
  32.             if (isset($this->model->timestamp) && in_array($field, $this->model->timestamp)) {
  33.                 return date('Y年m月d日', $fieldValue);
  34.             };
  35.             //处理元素备注
  36.             if (isset($this->model->default) && in_array($field, $this->model->default)) {
  37.                 $this->model->fieldsnm = $field;
  38.                 $this->model->property = 'Comment';
  39.                 return $this->model->getProperty($fieldValue);
  40.             };
  41.             return $fieldValue;
  42.         };
  43.         //样式
  44.         $css = <<<DOC
  45.         <!DOCTYPE html>
  46.         <html lang="en">
  47.         <head>
  48.         <meta charset="UTF-8">
  49.         <link rel="stylesheet" href="{$this->css}" type="text/css"/>
  50.         <title>Document</title>
  51.         </head>
  52.         <body>
  53.         DOC;
  54.         //数据
  55.         $data = $this->model->getData();
  56.         //字段
  57.         $fields = array_keys($data[0]);
  58.         //css样式表
  59.         $table .= $css;
  60.         $table .= '<table>';
  61.         //标题
  62.         $table .= '<caption>' . $this->title . '</caption>';
  63.         //表头
  64.         $table .= '<tr>';
  65.         foreach ($fields as $value) {
  66.             $table .= '<th>' . $replacestr($value, 'Comment') . '</th>';
  67.         }
  68.         $table .= '</tr>';
  69.         //主体
  70.         foreach ($data as $value) {
  71.             $table .= '<tr>';
  72.             foreach ($fields as $field) {
  73.                 $table .= '<td>' . $fieldsPro($value[$field], $field) . '</td>';
  74.             }
  75.             $table .= '</tr>';
  76.         }
  77.         //结束标志
  78.         $table .= '</table>';
  79.         $table .= '</body>';
  80.         $table .= '</html>';
  81.         return $table;
  82.     }
  83. }
View类用到的css文件
  1. /*文件src\MVC\css.css*/
  3. table {border-collapse: collapse; border: 1px solid;text-align: center;}
  4. caption {font-size: 1.2rem; margin-bottom: 10px;}
  5. tr:first-of-type { background-color:wheat;}
  6. td,th {border: 1px solid; padding:5px}
Container对象容器
  1. <?php
  2. //文件 src\MVC\Container.php
  4. namespace src\MVC;
  6. //对象容器
  7. class Container
  8. {
  9.     protected $container=[];
  10.     public function bind(string $name, \Closure $closure)
  11.     {
  12.         $this->container[$name]=$closure;
  13.     }
  15.     public function make(string $name, $params=[])
  16.     {
  17.         return call_user_func_array($this->container[$name], $params);
  18.     }
  19. }
Facade门面类
  1. <?php
  2. //文件 src\MVC\Facade.php
  4. namespace src\MVC;
  6. //Facade门面类
  7. class Facade
  8. {
  10.     protected static $container;
  11.     protected static $model;
  13.     public static function initialize(Container $container)
  14.     {
  15.         static::$container=$container;
  16.     }
  18.     public static function getData()
  19.     {
  20.         static::$model=static::$container->make('model');
  21.         static::$model->getData();
  22.     }
  24.     public static function fetch()
  25.     {
  26.         return static::$container->make('view',[static::$model])->fetch();
  27.     }
  28. }
Controller 控制器
  1. <?php
  2. //文件src\MVC\Controller.php
  4. namespace src\MVC;
  6. //控制器
  7. class Controller
  8. {
  9.     public function __construct(Container $container)
  10.     {
  11.         Facade::initialize($container);
  12.     }
  14.     public function index()
  15.     {
  16.         //model
  17.         Facade::getData();
  19.         //view
  20.         return Facade::fetch();
  21.     }
  22. }
自动加载类
  1. <?php
  2. //文件src\MVC\AutoLoad.php
  4. namespace src\MVC;
  6. spl_autoload_register(function($class)
  7. {
  8.     $prefix=__DIR__;
  9.     $arr=explode("\\",$class);
  10.     $file=$prefix."\\". $arr[count($arr)-1] . '.php';
  11.     $file = str_replace("\\", DIRECTORY_SEPARATOR, $file);
  12.     file_exists($file) ? require $file : "文件不存在，加载失败";
  13. });
调用类
  1. <?php
  2. //文件src\MVC\Main.php
  4. namespace src\MVC;
  6. //自动加载
  7. require 'AutoLoad.php';
  9. $container=new Container();
  11. $container->bind('model',function(){
  12.     $model= new Model();
  13.     $model->table='staffs';
  14.     //timestamp可添加时间字段集
  15.     $model->timestamp=['register_time','hiredate'];
  16.     //default可添加需解析备注Comment的字段集
  17.     $model->default=['sex'];
  18.     return $model;
  19. });
  21. $container->bind('view',function(Model $model){
  22.     $view= new View($model);
  23.     $view->title="人员信息表";
  24.     $view->css='css.css';
  25.     return $view;
  26. });
  28. $control=new Controller($container);
  29. echo $control->index();
结果
1. 使用的数据表staffs、users结构和内容




2. 运行结果




总结

Facade门面：是一种通过为多个复杂的子系统提供一个一致的接口，而使这些子系统更加容易被访问的模式。该模式对外有一个统一接口，外部应用程序不用关心内部子系统的具体的细节，这样会大大降低应用程序的复杂度，提高了程序的可维护性。

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：理解流程与原理, 目标, 远比能写代码要强, 因为代码你会很快忘记, 思维方式一直都会影响着你
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