PHP八大設(shè)計(jì)模式案例詳解

Test1.php
?php
namespace Test1;//命名空間Test1
function test(){
    echo __FILE__;
}
Test2.php
?php
namespace Test2; //命名空間Test2
function test(){
    echo __FILE__;//打印當(dāng)前文件所在的絕對(duì)路徑。
}
Test.php
?php
require 'Test1.php';
require 'Test2.php';
Test1\test();//通過這種方式，使用命名空間下的方法或者類。Test1表示命名空間，test()表示該命名空間下的一個(gè)方法。
echo "br>";
Test2\test();

Test1.php
?php
class Test1{
    static function test(){
        echo __FILE__;
    }
}
Test2.php
?php
class Test2
{
    static function test(){
        echo __FILE__;
    }
}
Test.php
?php
Test1::test();
Test2::test();

function __autoload($class){
    $dir  = __DIR__;
    $requireFile = $dir."\\".$class.".php";
    require $requireFile;
}

?php
spl_autoload_register('autoload1');
spl_autoload_register('autoload2');
//將實(shí)現(xiàn)自動(dòng)導(dǎo)入的函數(shù)，以字符串的形式傳入該函數(shù)中，即可解決重復(fù)導(dǎo)入文件導(dǎo)致的錯(cuò)誤問題。
Test1::test();
Test2::test();

function autoload1($class){
    $dir  = __DIR__;
    $requireFile = $dir."\\".$class.".php";
    require $requireFile;
}
function autoload2($class){
    $dir  = __DIR__;
    $requireFile = $dir."\\".$class.".php";
    require $requireFile;
}

Test1.php
?php
class Test1{
    static function test(){
        echo __FILE__;
    }
}

Factory.php
?php
class Factory{
    /*
     * 如果某個(gè)類在很多的文件中都new ClassName()，那么萬一這個(gè)類的名字
     * 發(fā)生變更或者參數(shù)發(fā)生變化，如果不使用工廠模式，就需要修改每一個(gè)PHP
     * 代碼，使用了工廠模式之后，只需要修改工廠類或者方法就可以了。
     */
    static function createDatabase(){
        $test = new Test1();
        return $test;
    }
}

Test.php
?php
spl_autoload_register('autoload1');

$test = Factory::createDatabase();
$test->test();
function autoload1($class){
    $dir  = __DIR__;
    $requireFile = $dir."\\".$class.".php";
    require $requireFile;
}

Test1.php
?php
class Test1{
    protected static  $tt;
    private function __construct(){}
    static function getInstance(){
        if(self::$tt){
            echo "對(duì)象已經(jīng)創(chuàng)建br>";
            return self::$tt;
        }else {
            self::$tt = new Test1();
            echo "創(chuàng)建對(duì)象br>";
            return self::$tt;
        }
    }
     function echoHello(){
        echo "Hellobr>";
    }
}
Test.php
?php
spl_autoload_register('autoload1');

$test = Test1::getInstance();
$test->echoHello();
$test = Test1::getInstance();
$test->echoHello();
$test = Test1::getInstance();
$test->echoHello();
$test = Test1::getInstance();
$test->echoHello();
function autoload1($class){
    $dir  = __DIR__;
    $requireFile = $dir."\\".$class.".php";
    require $requireFile;
}

?php

class Register
{
    protected static  $objects;
    function set($alias,$object)//將對(duì)象注冊(cè)到全局的樹上
    {
        self::$objects[$alias]=$object;//將對(duì)象放到樹上
    }
    static function get($name){
        return self::$objects[$name];//獲取某個(gè)注冊(cè)到樹上的對(duì)象
    }
    function _unset($alias)
    {
        unset(self::$objects[$alias]);//移除某個(gè)注冊(cè)到樹上的對(duì)象。
    }
}

接口 IDatabase
?php
namespace IMooc;
interface IDatabase
{
    function connect($host, $user, $passwd, $dbname);
    function query($sql);
    function close();
}

MySQL
?php
namespace IMooc\Database;
use IMooc\IDatabase;
class MySQL implements IDatabase
{
    protected $conn;
    function connect($host, $user, $passwd, $dbname)
    {
        $conn = mysql_connect($host, $user, $passwd);
        mysql_select_db($dbname, $conn);
        $this->conn = $conn;
    }

    function query($sql)
    {
        $res = mysql_query($sql, $this->conn);
        return $res;
    }

    function close()
    {
        mysql_close($this->conn);
    }
}

MySQLi
?php
namespace IMooc\Database;
use IMooc\IDatabase;
class MySQLi implements IDatabase
{
    protected $conn;

    function connect($host, $user, $passwd, $dbname)
    {
        $conn = mysqli_connect($host, $user, $passwd, $dbname);
        $this->conn = $conn;
    }

    function query($sql)
    {
        return mysqli_query($this->conn, $sql);
    }

    function close()
    {
        mysqli_close($this->conn);
    }
}

PDO
?php
namespace IMooc\Database;
use IMooc\IDatabase;
class PDO implements IDatabase
{
    protected $conn;
    function connect($host, $user, $passwd, $dbname)
    {
        $conn = new \PDO("mysql:host=$host;dbname=$dbname", $user, $passwd);
        $this->conn = $conn;
    }
function query($sql)
    {
        return $this->conn->query($sql);
    }

    function close()
    {
        unset($this->conn);
    }
}

UserStrategy.php
?php
/*
 * 聲明策略文件的接口，約定策略包含的行為。
 */
interface UserStrategy
{
    function showAd();
    function showCategory();
}

FemaleUser.php
?php
require_once 'Loader.php';
class FemaleUser implements UserStrategy
{
    function showAd(){
        echo "2016冬季女裝";
    }
    function showCategory(){
        echo "女裝";
    }
}

MaleUser.php
?php
require_once 'Loader.php';
class MaleUser implements UserStrategy
{
    function showAd(){
        echo "IPhone6s";
    }
    function showCategory(){
        echo "電子產(chǎn)品";
    }
}

Page.php//執(zhí)行文件
?php
require_once 'Loader.php';
class Page
{
    protected $strategy;
    function index(){
        echo "AD";
        $this->strategy->showAd();
        echo "br>";
        echo "Category";
        $this->strategy->showCategory();
        echo "br>";
    }
    function setStrategy(UserStrategy $strategy){
        $this->strategy=$strategy;
    }
}

$page = new Page();
if(isset($_GET['male'])){
    $strategy = new MaleUser();
}else {
    $strategy = new FemaleUser();
}
$page->setStrategy($strategy);
$page->index();

EventGenerator.php
?php
require_once 'Loader.php';
abstract class EventGenerator{
    private $observers = array();
    function addObserver(Observer $observer){
        $this->observers[]=$observer;
    }
    function notify(){
        foreach ($this->observers as $observer){
            $observer->update();
        }
    }
}

Observer.php
?php
require_once 'Loader.php';
interface Observer{
    function update();//這里就是在事件發(fā)生后要執(zhí)行的邏輯
}

?php
//一個(gè)實(shí)現(xiàn)了EventGenerator抽象類的類，用于具體定義某個(gè)發(fā)生的事件
require 'Loader.php';
class Event extends EventGenerator{
    function triger(){
        echo "Eventbr>";
    }
}
class Observer1 implements Observer{
    function update(){
        echo "邏輯1br>";
    }
}
class Observer2 implements Observer{
    function update(){
        echo "邏輯2br>";
    }
}
$event = new Event();
$event->addObserver(new Observer1());
$event->addObserver(new Observer2());
$event->triger();
$event->notify();

Canvas.php
?php
require_once 'Loader.php';
class Canvas{
private $data;
function init($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] = '#';
            }
        }
    }

    function draw(){
        foreach ($this->data as $line){
            foreach ($line as $char){
                echo $char;
            }
            echo "br>;";
        }
    }
}

Index.php
?php
require 'Loader.php';
$c = new Canvas();
$c->init();
/ $canvas1 = new Canvas();
// $canvas1->init();
$canvas1 = clone $c;//通過克隆，可以省去init()方法，這個(gè)方法循環(huán)兩百次
//去產(chǎn)生一個(gè)數(shù)組。當(dāng)項(xiàng)目中需要產(chǎn)生很多的這樣的對(duì)象時(shí)，就會(huì)new很多的對(duì)象，那樣
//是非常消耗性能的。
$canvas1->rect(2, 2, 8, 8);
$canvas1->draw();
echo "-----------------------------------------br>";
// $canvas2 = new Canvas();
// $canvas2->init();
$canvas2 = clone $c;
$canvas2->rect(1, 4, 8, 8);
$canvas2->draw();