MVC框架流程中服务容器和门面的应用-PHP培训十期线上班

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


<?php
//文件src\MVC\Model.php
namespace src\MVC;
class Model
{
    private $connect;
    public function __construct()
    {
        $this->connect = new \PDO('mysql:host=localhost;dbname=phpedu', 'root', 'root');
    }
    public function getData(): array
    {
        return $this->connect->query("SELECT * FROM `{$this->table}`")->fetchAll(\PDO::FETCH_ASSOC);
    }
    public function __set(string $name, $val)
    {
        $this->{$name} = $val;
    }
    //查看某个字段的属性
    public function getFildsInfo(\Closure $callback = NULL)
    {
        $stmt = $this->connect->query("SHOW full fields FROM `{$this->table}` " . (($this->fieldsnm) ? " where field='{$this->fieldsnm}';" : NULL));
        $fetch = $stmt->fetchAll(\PDO::FETCH_ASSOC);
        if (!isset($this->property)) {
            return $fetch[0];
        }
        $res = $fetch[0][$this->property];
        if (!$callback) {
            return $res;
        } else {
            return call_user_func_array($callback, [$res]);
        }
    }
    //将备注属性进行替换,备注用query_string的格式书写"性别?0=男&1=女"
    public function getProperty($name = NULL)
    {
        return $this->getFildsInfo(function ($str) use ($name) {
            $info = \parse_url($str);
            //如果没有query
            if ($name === NULL) return $info['path'];
            //如果有query
            if (isset($info['query'])) {
                \parse_str($info['query'], $params);
                return $params[$name];
            }
        });
    }
}

View类

<?php
//文件src\MVC\View.php
namespace src\MVC;
class View
{
    private $model;
    public function __construct(Model $model)
    {
        $this->model = $model;
    }
    public function __set(string $name, $val)
    {
        $this->{$name} = $val;
    }
    public function fetch()
    {
        //处理表头
        $replacestr = function ($fieldsnm, $property, $value = NULL) {
            $this->model->fieldsnm = $fieldsnm;
            $this->model->property = $property;
            $res = $this->model->getProperty($value);
            return (strlen(str_replace(' ', '', $res)) === 0) ? $fieldsnm : $res;
        };
        $fieldsPro = function ($fieldValue, $field) {
            //处理时间戳
            if (isset($this->model->timestamp) && in_array($field, $this->model->timestamp)) {
                return date('Y年m月d日', $fieldValue);
            };
            //处理元素备注
            if (isset($this->model->default) && in_array($field, $this->model->default)) {
                $this->model->fieldsnm = $field;
                $this->model->property = 'Comment';
                return $this->model->getProperty($fieldValue);
            };
            return $fieldValue;
        };
        //样式
        $css = <<<DOC
        <!DOCTYPE html>
        <html lang="en">
        <head>
        <meta charset="UTF-8">
        <link rel="stylesheet" href="{$this->css}" type="text/css"/>
        <title>Document</title>
        </head>
        <body>
        DOC;
        //数据
        $data = $this->model->getData();
        //字段
        $fields = array_keys($data[0]);
        //css样式表
        $table .= $css;
        $table .= '<table>';
        //标题
        $table .= '<caption>' . $this->title . '</caption>';
        //表头
        $table .= '<tr>';
        foreach ($fields as $value) {
            $table .= '<th>' . $replacestr($value, 'Comment') . '</th>';
        }
        $table .= '</tr>';
        //主体
        foreach ($data as $value) {
            $table .= '<tr>';
            foreach ($fields as $field) {
                $table .= '<td>' . $fieldsPro($value[$field], $field) . '</td>';
            }
            $table .= '</tr>';
        }
        //结束标志
        $table .= '</table>';
        $table .= '</body>';
        $table .= '</html>';
        return $table;
    }
}

View类用到的css文件

/*文件src\MVC\css.css*/
table {border-collapse: collapse; border: 1px solid;text-align: center;}
caption {font-size: 1.2rem; margin-bottom: 10px;}
tr:first-of-type { background-color:wheat;}
td,th {border: 1px solid; padding:5px}

Container对象容器

<?php
//文件 src\MVC\Container.php
namespace src\MVC;
//对象容器
class Container
{
    protected $container=[];
    public function bind(string $name, \Closure $closure)
    {
        $this->container[$name]=$closure;
    }
    public function make(string $name, $params=[])
    {
        return call_user_func_array($this->container[$name], $params);
    }
}

Facade门面类

<?php
//文件 src\MVC\Facade.php
namespace src\MVC;
//Facade门面类
class Facade
{
    protected static $container;
    protected static $model;
    public static function initialize(Container $container)
    {
        static::$container=$container;
    }
    public static function getData()
    {
        static::$model=static::$container->make('model');
        static::$model->getData();
    }
    public static function fetch()
    {
        return static::$container->make('view',[static::$model])->fetch();
    }
}

Controller 控制器

<?php
//文件src\MVC\Controller.php
namespace src\MVC;
//控制器
class Controller
{
    public function __construct(Container $container)
    {
        Facade::initialize($container);
    }
    public function index()
    {
        //model
        Facade::getData();
        //view
        return Facade::fetch();
    }
}

自动加载类

<?php
//文件src\MVC\AutoLoad.php
namespace src\MVC;
spl_autoload_register(function($class)
{
    $prefix=__DIR__;
    $arr=explode("\\",$class);
    $file=$prefix."\\". $arr[count($arr)-1] . '.php';
    $file = str_replace("\\", DIRECTORY_SEPARATOR, $file);
    file_exists($file) ? require $file : "文件不存在，加载失败";
});

调用类

<?php
//文件src\MVC\Main.php
namespace src\MVC;
//自动加载
require 'AutoLoad.php';
$container=new Container();
$container->bind('model',function(){
    $model= new Model();
    $model->table='staffs';
    //timestamp可添加时间字段集
    $model->timestamp=['register_time','hiredate'];
    //default可添加需解析备注Comment的字段集
    $model->default=['sex'];
    return $model;
});
$container->bind('view',function(Model $model){
    $view= new View($model);
    $view->title="人员信息表";
    $view->css='css.css';
    return $view;
});
$control=new Controller($container);
echo $control->index();