初探PHP设计模式

namespace \SPL\DataBase;
//接口
interface IDataBase {
    public function conn($host, $user, $pwd, $dbname);
    public function query($query);
    public function close();
}

//mysql
class Mysql implements IDataBase {
    protected $conn;
    public function conn($host, $user, $pwd, $dbname)
    {
        $this->conn = mysql_connect($host, $user, $pwd);
        mysql_select_db($dbname, $this->conn);
    }
    public function query($query)
    {
        return mysql_query($query);
    }
    public function close()
    {
        mysql_close($this->conn);
    }
}

//mysqli
namespace SPL\DataBase;
class Mysqli implements IDataBase {
    protected $conn;
    public function conn($host,$user,$pwd,$dbname)
    {
        $this->conn=mysqli_connect($host,$user,$pwd,$dbname);
    }
    public function query($query)
    {
        return mysqli_query($this->conn,$query);
    }
    public function close()
    {
        mysqli_close($this->conn);
    }
}

//PDO
namespace SPL\DataBase;
class PDO implements IDataBase {
    protected $conn;
    public function conn($host, $user, $pwd, $dbname)
    {
        $this->conn = new \PDO("mysql:host=$host;dbname=$dbname", $user, $pwd);
    }
    public function query($query)
    {
        $this->conn->query($query);
    }
    public function close()
    {
        unset($this->conn);
    }
}

require(‘SPL\DataBase\IDataBase.php‘);
$db=new \SPL\DataBase\Mysqli();
$res=$db->conn(‘localhost‘,‘root‘,‘root‘,‘mrmf‘);
$result=$db->query(‘show columns from user‘);
$rows = $result->fetch_array();
print_r($rows);
$db->close();

//接口
namespace SPL\Strategy;
interface UserStrategy {
    function showAd();
    function showCategory();
}
//女士用户
class FemaleUser implements UserStrategy {
    public function showAd()
    {
        echo "2022长袖连衣裙<br>";
    }

    public function showCategory()
    {
        echo "女装";
    }
}
//男士用户
class MaleUser implements UserStrategy {
    public function showAd()
    {
        echo "2019清商务休闲裤<br>";
    }

    public function showCategory()
    {
        echo "男装";
    }
}

class Page {
    private $strategy;

    public function index()
    {
        echo "name:", $this->strategy->showAd();
        echo "category:", $this->strategy->showCategory();
    }

    public function setStrategy(SPL\Strategy\UserStrategy $strategy)
    {
        $this->strategy = $strategy;
    }
}

//创建一个验证码表
CREATE TABLE `verify` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT ‘主键‘,
  `sort` smallint(6) NOT NULL COMMENT ‘验证码类型‘,
  `phone` varchar(20) NOT NULL COMMENT ‘手机号‘,
  `code` varchar(6) NOT NULL COMMENT ‘验证码‘,
  `ctime` varchar(19) NOT NULL COMMENT ‘发送时间‘,
  `num` smallint(6) NOT NULL DEFAULT ‘1‘ COMMENT ‘每日发送次数‘,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT=‘验证码表‘;

DataObject.php :
//创建一个与验证码表对应的类DataObject，添加一些方法。
namespace SPL;
class DataObject {
    //声明类属性和数据表中的字段映射
    public $db;
    public $id;
    public $sort;
    public $phone;
    public $code;
    public $ctime;
    public $num;
    //构造方法实现数据表的查询功能
    public function __construct($id)
    {
        $this->db = new DataBase\Mysqli();
        $this->db->conn(‘localhost‘, ‘root‘, ‘root‘, ‘mrmf‘);
        $res = $this->db->query("select * from verify where id=‘{$id}‘ limit 1");
        $data = $res->fetch_assoc();
        $this->id = $data[‘id‘];
        $this->sort = $data[‘sort‘];
        $this->phone = $data[‘phone‘];
        $this->code = $data[‘code‘];
        $this->ctime = $data[‘ctime‘];
        $this->num = $data[‘num‘];
    }
    //单独修改sort为默认值
    public function setDefSort($id,$value)
    {
        $this->db = Factory::createDataObject($id);
        $this->sort =$value;
    }

    public function setDefPhone($id,$value)
    {
        $this->db = Factory::createDataObject($id);
        $this->sort = $value;
    }
    //析构方法为数据表的修改功能
        public function __destruct()
    {
        $this->db->query("update verify set sort={$this->sort},phone={$this->phone},code={$this->code},ctime={$this->ctime},num={$this->num} where id={$this->id}");
    }
}
Factory :
//添加关于DataObject类的工厂方法
    static function createDataObject($id)
    {
        $key = ‘Db‘ . $id;
        $db = Register::get($key);
        if (!$db) {
            $db = new DataBase\Mysqli();
            $db->conn(‘localhost‘, ‘root‘, ‘root‘, ‘mrmf‘);
            Register::set(‘Db‘ . $id, $db);
        }
        return $db;
    }

Observer.php
//定义一个观察者接口
interface Observer {
    public function update($id);
}

YnVip.php
//定义两个具体的观察者类
class YnVip implements Observer {
    public function update($id=‘‘)
    {
        echo empty($id)?‘no vip‘:‘yes vip‘,‘<br>‘;
    }
}
YnNewUser.php

class YnNewUser implements Observer {
    public function update($id=‘‘)
    {
        echo empty($id) ? ‘no new user‘ : ‘yes new user‘,‘<br>‘;
    }
}

commom.php
//定义一个基类作为事件触发类
class Common {
    private $observer;
    public $id;
    //新增观察者
    function addObserver(Observer $observer){
        $this->observer[]=$observer;
    }
    //通知各个观察者(执行观察者中的方法)
    function notify(){
        foreach ($this->observer as $observer) {
            $observer->update($this->id);
    }
    }
}

//定义一个继承了Common类的子类
class Login extends Common {
    public function login($id=‘‘){
        echo "执行登录",‘<br>‘;
        $this->id=$id;
    }
}

class Prototype {
    private $data;
    function __construct()
    {
        echo "调用class Prototype类<br>";
    }
    function init($width = 20, $height = 10)
    {
        $data = array();
        for ($i = 0; $i < $height; $i++) {
            for ($j = 0; $j < $width; $j++) {
                $data[$i][$j] = ‘*‘;
            }
        }
        $this->data = $data;
    }
    function rect($x1, $y1, $x2, $y2)
    {
        foreach ($this->data as $k1 => $line) {
            if ($x1 > $k1 or $x2 < $k1) continue;
            foreach ($line as $k2 => $char) {
                if ($y1 > $k2 or $y2 < $k2) continue;
                $this->data[$k1][$k2] = ‘&#8194‘;
            }
        }
    }
    function draw()
    {
        foreach ($this->data as $line) {
            foreach ($line as $char) {
                echo $char;
            }
            echo "<br>";
        }
    }
}