外观模式

在 2015年7月15日上张贴由 BestLove

<?php 
//外观模式，为子系统中的一组接口提供一个一致的界面，定义一个高层接口，这个接口使得这一子系统更加容易使用。－－引自百度百科
//组装电脑 客户端给出指定规则的配置，调用安装方法即可
class Board {
    public $name = '主板';
    public function __set($name, $value) {
        $this->$name = $value;
    }
    public function __get($name) {
        if (isset($this->$name)) {
            return $this->$name;
        } else {
            return null;
        }
    }
}

class CPU {
    private $name = 'CPU';
    public function __set($name, $value) {
        $this->$name = $value;
    }
    public function __get($name) {
        if (isset($this->$name)) {
            return $this->$name;
        } else {
            return null;
        }
    }
}

class Memory {
    public $name = '内存';
    public function __set($name, $value) {
        $this->$name = $value;
    }
    public function __get($name) {
        if (isset($this->$name)) {
            return $this->$name;
        } else {
            return null;
        }
    }
}

class HardDisk {
    public $name = '硬盘';
    public function __set($name, $value) {
        $this->$name = $value;
    }
    public function __get($name) {
        if (isset($this->$name)) {
            return $this->$name;
        } else {
            return null;
        }
    }
}

class Graphics {
    public $name = '显卡';
    public function __set($name, $value) {
        $this->$name = $value;
    }
    public function __get($name) {
        if (isset($this->$name)) {
            return $this->$name;
        } else {
            return null;
        }
    }
}

//...

class Computer {
    public function install(array $info) {
        foreach ($info as $class => $params) {
            $this->$class($params);
        }
    }
    public function __call($className, $params) {
        if (class_exists($className)) {
            $class = new $className();
            $class->name = $params[0];
            echo '安装 ' . $class->name . '<br>';
        } else {
            echo '没有' . $params[0] . '<br>';
        }
    }
}

//client
$info = array(
    'Board' => '华硕主板',
    'CPU' => 'intel cpu',
    'Memory' => '金士顿内存',
    'HardDisk' => '西部数据硬盘',
    'Graphics' => '七彩虹显卡',
    'test' => '三星显示屏'
);
echo '我要装一台电脑，配置如下：<br>';
echo '<pre>';
print_r($info);
echo '<br>好的，这就帮你装<br><br>';
$computer = new Computer();
$computer->install($info);
echo '<br>装好了<br>';

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<?php

//外观模式，为子系统中的一组接口提供一个一致的界面，定义一个高层接口，这个接口使得这一子系统更加容易使用。－－引自百度百科

//组装电脑客户端给出指定规则的配置，调用安装方法即可

class Board {

public $name = '主板';

public function __set($name, $value) {

$this->$name = $value;

}

public function __get($name) {

if (isset($this->$name)) {

return $this->$name;

} else {

return null;

}

class CPU {

private $name = 'CPU';

public function __set($name, $value) {

$this->$name = $value;

}

public function __get($name) {

if (isset($this->$name)) {

return $this->$name;

} else {

return null;

}

class Memory {

public $name = '内存';

public function __set($name, $value) {

$this->$name = $value;

}

public function __get($name) {

if (isset($this->$name)) {

return $this->$name;

} else {

return null;

}

class HardDisk {

public $name = '硬盘';

public function __set($name, $value) {

$this->$name = $value;

}

public function __get($name) {

if (isset($this->$name)) {

return $this->$name;

} else {

return null;

}

class Graphics {

public $name = '显卡';

public function __set($name, $value) {

$this->$name = $value;

}

public function __get($name) {

if (isset($this->$name)) {

return $this->$name;

} else {

return null;

}

//...

class Computer {

public function install(array $info) {

foreach ($info as $class => $params) {

$this->$class($params);

}

public function __call($className, $params) {

if (class_exists($className)) {

$class = new $className();

$class->name = $params[0];

echo '安装 ' . $class->name . ' ';

} else {

echo '没有' . $params[0] . ' ';

}

//client

$info = array(

'Board' => '华硕主板',

'CPU' => 'intel cpu',

'Memory' => '金士顿内存',

'HardDisk' => '西部数据硬盘',

'Graphics' => '七彩虹显卡',

'test' => '三星显示屏'

);

echo '我要装一台电脑，配置如下： ';

echo '<pre>';

print_r($info);

echo ' 好的，这就帮你装 ';

$computer = new Computer();

$computer->install($info);

echo ' 装好了 ';

解释器模式

在 2015年7月15日上张贴由 BestLove

<?php
//解释器模式，把一段有规律的经常用到的内容解释成预期的内容，常用的MVC模式中的模板替换就使用了解释器模式
//一个简单的计算+-*/的计算器，代码比较臃肿。
class Calculator {   
    public function interpreter($str) {
        $str = str_replace(' ', '', $str);
        $str = str_replace(array('+','-','*','/'), array(' + ',' - ',' * ',' / '), $str);
        $arr = explode(' ', $str);
        unset($str);
        $count = count($arr)-1;
        $offset = 1000;
        for($i = 0; $i < $count; ++$i) {
            if ($arr[$i] == '*' || $arr[$i] == '/') {
                $arr[$i-$offset] = $arr[$i];
                if (!isset($arr[$i-1])) {
                    $arr[$i-1] = $tmp;
                }
                $arr[$i-1-$offset] = $arr[$i-1];
                $arr[$i+1-$offset] = $arr[$i+1];
                unset($arr[$i-1]);
                unset($arr[$i]);
                $tmp = $arr[$i+1];
                unset($arr[$i+1]);
                ++$i;
            }
        }
        $left = array();
        $right = array();
        ksort($arr);
        array_walk($arr, function($v, $k) use(&$left, &$right){
            if ($k < 0) {
                $left[]= $v;
            } else {
                $right[]= $v;
            }
        });
        unset($arr);
        $countLeft = count($left) - 1;
        $countRight = count($right) - 1;
        $tmp = array();
        for ($i=0; $i < $countLeft; ++$i) {
            if ($left[$i] == '*' || $left[$i] == '/') {
                if (!isset($left[$i-1])) {
                    $tmpNum = $tmp[count($tmp)-1] = $this->compute($tmpNum, $left[$i+1], $left[$i]);
                    unset($left[$i+1]); 
                } else {
                    $tmpNum = $this->compute($left[$i-1], $left[$i+1], $left[$i]);
                    $tmp[] = $tmpNum;
                    unset($left[$i+1]);
                }
                ++$i;
            }
        }
        unset($left);
        for ($i=0; $i < $countRight; ++$i) {
            if ($right[$i] == '+' || $right[$i] == '-') {
                if ($i == 0) {
                    $input = array(array_shift($tmp));
                    array_splice($right, $i, 0, $input);
                    ++$countRight;
                    continue;
                }
                if ($right[$i+1] == '+' || $right[$i+1] == '-') {
                    $input = array(array_shift($tmp));
                    array_splice($right, $i+1, 0, $input);
                    ++$countRight;
                }
            }
        }
        if (!empty($tmp)) {
            array_push($right, current($tmp));
        }
        $rs = array_shift($right);
        $countRight = count($right);
        for ($i=0; $i < $countRight; ++$i) {
            if ($right[$i] == '+' || $right[$i] == '-') {
                $rs = $this->compute($rs, $right[$i+1], $right[$i]);
            }
        }
        return $rs;
    }

    private function compute($num1, $num2, $expression) {
        switch ($expression) {
            case '+':
                return $num1 + $num2;
            case '-':
                return $num1 - $num2;  
            case '*':
                return $num1 * $num2;
            case '/':
                if ($num2 == 0) {
                    exit('can not divide 0');
                }
                return round($num1 / $num2, 4);
            default:exit('param error');
        }
    }
}

$str = '1-1-2*3*2*3+1+1+2*2*2*2/3-2+3*7*2/2-1+9/3';
$calculator = new Calculator();
$rs = $calculator->interpreter($str);
echo $rs;

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<?php

//解释器模式，把一段有规律的经常用到的内容解释成预期的内容，常用的MVC模式中的模板替换就使用了解释器模式

//一个简单的计算+-*/的计算器，代码比较臃肿。

class Calculator {

public function interpreter($str) {

$str = str_replace(' ', '', $str);

$str = str_replace(array('+','-','*','/'), array(' + ',' - ',' * ',' / '), $str);

$arr = explode(' ', $str);

unset($str);

$count = count($arr)-1;

$offset = 1000;

for($i = 0; $i < $count; ++$i) {

if ($arr[$i] == '*' || $arr[$i] == '/') {

$arr[$i-$offset] = $arr[$i];

if (!isset($arr[$i-1])) {

$arr[$i-1] = $tmp;

}

$arr[$i-1-$offset] = $arr[$i-1];

$arr[$i+1-$offset] = $arr[$i+1];

unset($arr[$i-1]);

unset($arr[$i]);

$tmp = $arr[$i+1];

unset($arr[$i+1]);

++$i;

}

$left = array();

$right = array();

ksort($arr);

array_walk($arr, function($v, $k) use(&$left, &$right){

if ($k < 0) {

$left[]= $v;

} else {

$right[]= $v;

}

});

unset($arr);

$countLeft = count($left) - 1;

$countRight = count($right) - 1;

$tmp = array();

for ($i=0; $i < $countLeft; ++$i) {

if ($left[$i] == '*' || $left[$i] == '/') {

if (!isset($left[$i-1])) {

$tmpNum = $tmp[count($tmp)-1] = $this->compute($tmpNum, $left[$i+1], $left[$i]);

unset($left[$i+1]);

} else {

$tmpNum = $this->compute($left[$i-1], $left[$i+1], $left[$i]);

$tmp[] = $tmpNum;

unset($left[$i+1]);

}

++$i;

}

unset($left);

for ($i=0; $i < $countRight; ++$i) {

if ($right[$i] == '+' || $right[$i] == '-') {

if ($i == 0) {

$input = array(array_shift($tmp));

array_splice($right, $i, 0, $input);

++$countRight;

continue;

}

if ($right[$i+1] == '+' || $right[$i+1] == '-') {

$input = array(array_shift($tmp));

array_splice($right, $i+1, 0, $input);

++$countRight;

}

if (!empty($tmp)) {

array_push($right, current($tmp));

}

$rs = array_shift($right);

$countRight = count($right);

for ($i=0; $i < $countRight; ++$i) {

if ($right[$i] == '+' || $right[$i] == '-') {

$rs = $this->compute($rs, $right[$i+1], $right[$i]);

}

return $rs;

}

private function compute($num1, $num2, $expression) {

switch ($expression) {

case '+':

return $num1 + $num2;

case '-':

return $num1 - $num2;

case '*':

return $num1 * $num2;

case '/':

if ($num2 == 0) {

exit('can not divide 0');

}

return round($num1 / $num2, 4);

default:exit('param error');

}

$str = '1-1-2*3*2*3+1+1+2*2*2*2/3-2+3*7*2/2-1+9/3';

$calculator = new Calculator();

$rs = $calculator->interpreter($str);

echo $rs;

中介者模式

在 2015年7月13日2015年12月30日上张贴由 BestLove

<?php
interface Mediator {
    public function setUser(User $user);
    public function send($message, User $sendUser, User $receiveUser=null);
}

abstract class User {
    protected $mediator = null;
    public function setMediator(Mediator $mediator) {
        $mediator->setUser($this);
        $this->mediator = $mediator;
    }
    abstract public function send($message, User $receiveUser=null);
}

class QQMediator implements Mediator {
    private $users = array();
    public function setUser(User $user) {
        $this->users[]=$user;
    }
    public function send($message, User $sendUser, User $receiveUser=null) {
        foreach ($this->users as $user) {
            if ($user === $sendUser) {
                continue;
            }
            if ($receiveUser !== null && $receiveUser !== $user) {
                continue;
            }
            echo $user->name . '接收到了来自' . $sendUser->name . '的信息：' . $message . '<br>';
        }

    }
}

class User1 extends User {
    public $name = '用户1';
    public function send($message, User $receiveUser=null) {
        $this->mediator->send($message, $this, $receiveUser);
    }
}

class User2 extends User {
    public $name = '用户2';
    public function send($message, User $receiveUser=null) {
        $this->mediator->send($message, $this, $receiveUser);
    }
}

class User3 extends User {
    public $name = '用户3';
    public function send($message, User $receiveUser=null) {
        $this->mediator->send($message, $this, $receiveUser);
    }
}

$mediator = new QQMediator();
$user1 = new User1();
$user1->setMediator($mediator);
$user2 = new User2();
$user2->setMediator($mediator);
$user3 = new User3();
$user3->setMediator($mediator);

echo '群发：<br>';
$user1->send('你们好啊');
echo '<br>单发：<br>';
$user2->send('你好用户3', $user3);

<?php

interface Mediator {

public function setUser(User $user);

public function send($message, User $sendUser, User $receiveUser=null);

}

abstract class User {

protected $mediator = null;

public function setMediator(Mediator $mediator) {

$mediator->setUser($this);

$this->mediator = $mediator;

}

abstract public function send($message, User $receiveUser=null);

}

class QQMediator implements Mediator {

private $users = array();

public function setUser(User $user) {

$this->users[]=$user;

}

public function send($message, User $sendUser, User $receiveUser=null) {

foreach ($this->users as $user) {

if ($user === $sendUser) {

continue;

}

if ($receiveUser !== null && $receiveUser !== $user) {

continue;

}

echo $user->name . '接收到了来自' . $sendUser->name . '的信息：' . $message . ' ';

}

class User1 extends User {

public $name = '用户1';

public function send($message, User $receiveUser=null) {

$this->mediator->send($message, $this, $receiveUser);

}

class User2 extends User {

public $name = '用户2';

public function send($message, User $receiveUser=null) {

$this->mediator->send($message, $this, $receiveUser);

}

class User3 extends User {

public $name = '用户3';

public function send($message, User $receiveUser=null) {

$this->mediator->send($message, $this, $receiveUser);

}

$mediator = new QQMediator();

$user1 = new User1();

$user1->setMediator($mediator);

$user2 = new User2();

$user2->setMediator($mediator);

$user3 = new User3();

$user3->setMediator($mediator);

echo '群发： ';

$user1->send('你们好啊');

echo ' 单发： ';

$user2->send('你好用户3', $user3);

原型模式

在 2015年7月10日2015年7月10日上张贴由 BestLove

<?php 
//原型模式：当需要创建的类消耗比较大时可以使用，感觉直接用显示clone也是可以的
class Prototype {
    private $name = '';
    public function setName($name) {
        $this->name = $name;
    }
    public function getName() {
        return $this->name;
    }
    public function copy() {
        return clone $this;   //浅拷贝
    }
    public function __clone() {
        //被拷贝时，可以定制一些改变
        $this->name = $this->name . '(备份)';
    }
}

$test1 = new Prototype();
$test1->setName('张三');
$test2 = $test1->copy();
echo $test1->getName();
echo '<br>';
echo $test2->getName();

//test1输出张三 test2输出张三(备份) 感觉是不是跟$test2 = clone $test1;一样的。。。

//当然被clone的对象里面还有引用的话，浅拷贝是无法完全clone的，需要再次使用clone，如果被clone的对象里面还有引用的话需要层层往上clone。。此时，就不太适合使用原型模式了，可以使用直接序列化和反序列化

//浅复制
class Obj1 {
    private $name = '我是你的对象';
    public function getName() {
        return $this->name;
    }
}

class Obj2 {
    private $obj = null;
    public function __construct($obj) {
        $this->obj = $obj;
    }
    public function getObj() {
        return $this->obj;
    }
}

$obj1 = new Obj1();
$obj2 = new Obj2($obj1);
$obj3 = clone $obj2;

//输出结果为true，说明$obj对象是一个引用，并没有完全clone
var_dump(spl_object_hash($obj2->getObj()) === spl_object_hash($obj3->getObj()));

//深复制
class Obj4 {
    private $obj = null;
    public function __construct($obj) {
        $this->obj = $obj;
    }
    public function getObj() {
        return $this->obj;
    }
    public function __clone() {
        $this->obj = clone $this->obj;  //当对象被clone的时候，再次clone内部对象
    }
}

$obj4 = new Obj4($obj1);
$obj5 = clone $obj4;

//输出结果为false，因为$obj对象被再次clone了
var_dump(spl_object_hash($obj4->getObj()) === spl_object_hash($obj5->getObj()));

//序列化
$obj6 = unserialize(serialize($obj2));
//输出结果为false
var_dump(spl_object_hash($obj2->getObj()) === spl_object_hash($obj6->getObj()));

<?php

//原型模式：当需要创建的类消耗比较大时可以使用，感觉直接用显示clone也是可以的

class Prototype {

private $name = '';

public function setName($name) {

$this->name = $name;

}

public function getName() {

return $this->name;

}

public function copy() {

return clone $this; //浅拷贝

}

public function __clone() {

//被拷贝时，可以定制一些改变

$this->name = $this->name . '(备份)';

}

$test1 = new Prototype();

$test1->setName('张三');

$test2 = $test1->copy();

echo $test1->getName();

echo ' ';

echo $test2->getName();

//test1输出张三 test2输出张三(备份) 感觉是不是跟$test2 = clone $test1;一样的。。。

//当然被clone的对象里面还有引用的话，浅拷贝是无法完全clone的，需要再次使用clone，如果被clone的对象里面还有引用的话需要层层往上clone。。此时，就不太适合使用原型模式了，可以使用直接序列化和反序列化

//浅复制

class Obj1 {

private $name = '我是你的对象';

public function getName() {

return $this->name;

}

class Obj2 {

private $obj = null;

public function __construct($obj) {

$this->obj = $obj;

}

public function getObj() {

return $this->obj;

}

$obj1 = new Obj1();

$obj2 = new Obj2($obj1);

$obj3 = clone $obj2;

//输出结果为true，说明$obj对象是一个引用，并没有完全clone

var_dump(spl_object_hash($obj2->getObj()) === spl_object_hash($obj3->getObj()));

//深复制

class Obj4 {

private $obj = null;

public function __construct($obj) {

$this->obj = $obj;

}

public function getObj() {

return $this->obj;

}

public function __clone() {

$this->obj = clone $this->obj; //当对象被clone的时候，再次clone内部对象

}

$obj4 = new Obj4($obj1);

$obj5 = clone $obj4;

//输出结果为false，因为$obj对象被再次clone了

var_dump(spl_object_hash($obj4->getObj()) === spl_object_hash($obj5->getObj()));

//序列化

$obj6 = unserialize(serialize($obj2));

//输出结果为false

var_dump(spl_object_hash($obj2->getObj()) === spl_object_hash($obj6->getObj()));

装饰模式

在 2015年7月9日2015年7月9日上张贴由 BestLove

<?php 
    class MilkTea {
        private $name = '奶茶';
        private $price = 3;
        public function setName($prefix) {
            $this->name = $prefix . $this->name;
        }
        public function setPrice($price) {
            $this->price += $price;
        }
        public function info() {
            echo $this->name . '售价' . $this->price . '元';
            echo '<br>';
        }
    }

    abstract class Decoration {
        abstract public function addDecoration(MilkTea $milkTea);
    }

    class PearlDecoration extends Decoration {
        public function addDecoration(MilkTea $milkTea) {
            $milkTea->setName('珍珠');
            $milkTea->setPrice(2);
        }
    }

    class RedBeanDecoration extends Decoration {
        public function addDecoration(MilkTea $milkTea) {
            $milkTea->setName('红豆');
            $milkTea->setPrice(2);
        }
    }

    $milkTea = new MilkTea();
    $milkTea->info();
    $pearlDecoration = new PearlDecoration();
    $pearlDecoration->addDecoration($milkTea);
    $milkTea->info();
    $redBeanDecoration = new RedBeanDecoration();
    $redBeanDecoration->addDecoration($milkTea);
    $milkTea->info();
    //第一次输出：奶茶售价3元，加了珍珠（装饰）后输出：珍珠奶茶售价5元，加了红豆（装饰）后输出：红豆珍珠奶茶售价7元

<?php

class MilkTea {

private $name = '奶茶';

private $price = 3;

public function setName($prefix) {

$this->name = $prefix . $this->name;

}

public function setPrice($price) {

$this->price += $price;

}

public function info() {

echo $this->name . '售价' . $this->price . '元';

echo ' ';

}

abstract class Decoration {

abstract public function addDecoration(MilkTea $milkTea);

}

class PearlDecoration extends Decoration {

public function addDecoration(MilkTea $milkTea) {

$milkTea->setName('珍珠');

$milkTea->setPrice(2);

}

class RedBeanDecoration extends Decoration {

public function addDecoration(MilkTea $milkTea) {

$milkTea->setName('红豆');

$milkTea->setPrice(2);

}

$milkTea = new MilkTea();

$milkTea->info();

$pearlDecoration = new PearlDecoration();

$pearlDecoration->addDecoration($milkTea);

$milkTea->info();

$redBeanDecoration = new RedBeanDecoration();

$redBeanDecoration->addDecoration($milkTea);

$milkTea->info();

//第一次输出：奶茶售价3元，加了珍珠（装饰）后输出：珍珠奶茶售价5元，加了红豆（装饰）后输出：红豆珍珠奶茶售价7元

迭代器模式

在 2015年5月11日2015年5月12日上张贴由 BestLove

<?php 
class CD{
    public $singer = '';
    public $title = '';
    public $songList = array();

    public function __construct($singer, $title) {
        $this->singer = $singer;
        $this->title = $title;
    }

    public function addSong($song) {
        $this->songList[]= $song;
    }
}

class CDSearchBySingerIterator implements \Iterator {
    private $_cds = array();
    private $_valid = false;

    public function __construct($singer) {
        $rs = $this->search($singer);
        $this->init($rs);
    }

    private function search($singer) {
        //不走mysql，直接构造假数据
        //select c.id,c.singer,c.title,s.song from cd c left join songs s on c.id=s.cd_id where c.singer='$singer'
        $arr = array(
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美1'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美2'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美7'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美8'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美9'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美10'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香1'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香2'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香3'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香4'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香5'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香6'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香7'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香8'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香9'),
            array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香10'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美3'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美4'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美5'),
            array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美6')
        );
        return $arr;
    }

    private function init($data) {
        foreach ($data as $v) {
           if (!isset($this->_cds[$v['id']])) {
               $this->_cds[$v['id']] = new CD($v['singer'], $v['title']);
           }
           $this->_cds[$v['id']]->addSong($v['song']);
        }
    }

    public function next() {
        return next($this->_cds);
    }

    public function rewind() {
        return reset($this->_cds);
    }

    public function valid() {
        return $this->_valid;
    }

    public function current() {
        return current($this->_cds);
    }

    public function key() {
        return key($this->_cds);
    }
}

$cds = new CDSearchBySingerIterator('Jay');

foreach ($cds as $v) {
    echo '专辑信息如下：<br>';
    echo '标题：' . $v->title . '<br>';
    echo '歌手：' . $v->singer . '<br>';
    foreach ($v->songList as $key => $song) {
        echo '曲目' . ($key+1) . '：' . $song . '<br>';
    }
    echo '<br>';
}

<?php

class CD{

public $singer = '';

public $title = '';

public $songList = array();

public function __construct($singer, $title) {

$this->singer = $singer;

$this->title = $title;

}

public function addSong($song) {

$this->songList[]= $song;

}

class CDSearchBySingerIterator implements \Iterator {

private $_cds = array();

private $_valid = false;

public function __construct($singer) {

$rs = $this->search($singer);

$this->init($rs);

}

private function search($singer) {

//不走mysql，直接构造假数据

//select c.id,c.singer,c.title,s.song from cd c left join songs s on c.id=s.cd_id where c.singer='$singer'

$arr = array(

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美1'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美2'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美7'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美8'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美9'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美10'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香1'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香2'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香3'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香4'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香5'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香6'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香7'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香8'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香9'),

array('id' => 2, 'singer' => $singer, 'title' => '七里香', 'song' => '七里香10'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美3'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美4'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美5'),

array('id' => 1, 'singer' => $singer, 'title' => '叶惠美', 'song' => '叶惠美6')

);

return $arr;

}

private function init($data) {

foreach ($data as $v) {

if (!isset($this->_cds[$v['id']])) {

$this->_cds[$v['id']] = new CD($v['singer'], $v['title']);

}

$this->_cds[$v['id']]->addSong($v['song']);

}

public function next() {

return next($this->_cds);

}

public function rewind() {

return reset($this->_cds);

}

public function valid() {

return $this->_valid;

}

public function current() {

return current($this->_cds);

}

public function key() {

return key($this->_cds);

}

$cds = new CDSearchBySingerIterator('Jay');

foreach ($cds as $v) {

echo '专辑信息如下： ';

echo '标题：' . $v->title . ' ';

echo '歌手：' . $v->singer . ' ';

foreach ($v->songList as $key => $song) {

echo '曲目' . ($key+1) . '：' . $song . ' ';

}

echo ' ';

}

唐晓锋–BLOG

This is just a personal note.

分类：设计模式

外观模式

解释器模式

中介者模式

原型模式

装饰模式

迭代器模式