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zhouqiang
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git init
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‎.gitignore

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/example/

‎Adapter.class.php

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<?php
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/**
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* 适配器模式
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* 解决问题：在转换一个对象的接口用于另一个对象时，实现Adapter对象不仅是最佳做法，而且也能减少很多麻烦
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*/
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class errorObject
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{
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private $__error;
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public function __construct($error)
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{
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$this->__error = $error;
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}
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public function getError()
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{
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return $this->__error;
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}
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}
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//原需求
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class logToConsole
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{
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private $__errorObject;
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public function __construct($errorObject)
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{
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$this->__errorObject = $errorObject;
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}
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public function write()
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{
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fwrite(STDERR, $this->__errorObject->getError());
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}
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}
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//新需求改变了
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class logToCSV
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{
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const CSV_LOCATION = "log.csv";
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private $__errorObject;
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public function __construct($errorObject)
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{
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$this->__errorObject = $errorObject;
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}
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public function write()
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{
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$line = $this->__errorObject->getErrorNumber();
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$line .= ",";
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$line .= $this->__errorObject->getErrorText();
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$Line .= "\n";
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file_put_contents(self::CSV_LOCATION, $line, FILE_APPEND);
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}
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}
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//增加适配器，保持公共接口的标准性
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class logToCsvAdapter extends errorObject
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{
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private $__errorNumber, $__errorText;
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public function __construct($error)
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{
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parent::__construct($error);
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$parts = explode(":", $this->getError());
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$this->__errorNumber = $parts[0];
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$this->__errorText = $parts[1];
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}
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public function getErrorNumber()
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{
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return $this->__errorNumber;
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}
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public function getErrorText()
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{
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return $this->__errorText;
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}
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}
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//$error = new errorObject("404:Not Found");
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//$log = new logToConsole($error);
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//使用适配器来更新接口
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$error = new logToCsvAdapter("404:Not Found");
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$log = logToCSV($error);
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$log->write();
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?>

‎Build.class.php

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<?php
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/**
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* 建造者模式
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* 解决问题：消除其他对象的复杂创建过程，这是最佳做法，而且在对象的构造和配置方法改变时，可以尽可能的减少重复更改代码。
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*/
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class product
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{
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protected $_type = "";
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protected $_size = "";
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protected $_color = "";
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//假设有三个复杂的创建过程
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public function setType($type)
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{
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$this->_type = $type;
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}
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public function setSize($size)
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{
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$this->_size = $size;
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}
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public function setColor($color)
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{
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$this->_color = $color;
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}
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}
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$productConfigs = array('type'=>'shirt','size'=>'XL','color'=>'red');
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$product = new product();
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//创建对象时分别调用每个方法不是最佳做法，扩展和可适应性低
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$product->setType($productConfigs['type']);
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$product->setSize($productConfigs['size']);
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$product->setColor($productConfigs['color']);
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//复杂的创建过程中使用构造函数来实现更不可取。
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//建造者模式
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class productBuilder
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{
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protected $_product = null;
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protected $_configs = array();
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public function __construct($configs)
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{
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$this->_product = new product();
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$this->_configs = $configs;
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}
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public function build()
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{
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$this->_product->setSize($this->_configs['size']);
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$this->_product->setType($this->_configs['type']);
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$this->_product->setColor($this->_configs['color']);
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}
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public function getProduct()
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{
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return $this->_product;
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}
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}
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$builder = new productBuilder($productConfigs);
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$builder->build();
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$product = $builder->getProduct();
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‎Dao.class.php

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<?php
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/**
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* 数据访问对象模式
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* 解决问题：如何创建透明访问任何数据源的对象(重复和数据源抽象化)
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*/
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abstract class baseDAO
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{
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private $__connection;
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public function __construct()
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{
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$this->__connectToDB(DB_USER, DB_PASS, DB_HOST, DB_DATABASE);
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}
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private function __connectToDB($user, $pass, $host, $database)
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{
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$this->__connection = mysql_connect($host, $user, $pass);
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mysql_select_db($database, $this->__connection);
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}
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public function fetch($value, $key = NULL)
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{
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if(is_null($key))
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{
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$key = $this->_primaryKey;
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}
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$sql = "select * from {$this->_tableName} where {$key}='{$value}'";
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$results = mysql_query($sql, $this->__connection);
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$rows = array();
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while ($result = mysql_fetch_array($results))
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{
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$rows[] = $result;
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}
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return $rows;
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}
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public function update($keyedArray)
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{
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$sql = "update {$this->_tableName} set ";
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foreach ($keyedArray as $column=>$value)
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{
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$updates[] = "{$column} = '{$value}' ";
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}
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$sql .= implode(",",$updates);
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$sql .= "where {$this->_primaryKey}='{$keyedArray[$this->_primaryKey]}'";
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mysql_query($sql, $this->__connection);
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}
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}
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class userDAO extends baseDAO
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{
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protected $_tableName = "userTable";
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protected $_primaryKey = "id";
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public function getUserByFirstName($name)
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{
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$result = $this->fetch($name, 'firstName');
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return $result;
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}
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}
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$user = new userDAO();
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$id = 1;
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$userInfo = $user->fetch($id);
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$updates = array('id'=>1, 'firstName'=>'arlon');
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$user->update($updates);
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$all = $user->getUserByFirstName('arlon');

‎Decorator.class.php

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<?php
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/**
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*
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* 装饰器设计模式适用于下列工作场合： 需求变化是快速和细小的，而且几乎不影响应用程序的其他部分
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* 使用装饰器设计模式设计类的目标是： 不必重写任何已有的功能性代码，而是对某个基于对象应用增量变化。
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* 装饰器设计模式采用这样的构建方式： 在主代码流中应该能够直接插入一个或多个更改或“装饰”目标对象的装饰器，同时不影响其他代码流。
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*
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*/
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class CD {
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public $trackList;
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public function __construct() {
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$this->trackList = array();
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}
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public function addTrack($track) {
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$this->trackList[] = $track;
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}
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public function getTrackList() {
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$output = '';
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foreach ($this->trackList as $num => $track) {
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$output .= ($num + 1) . ") {$track}.";
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}
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return $output;
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}
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}
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$tracksFroExternalSource = array("What It Means", "Brr", "Goodbye");
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$myCD = new CD();
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foreach ($tracksFroExternalSource as $track) {
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$myCD->addTrack($track);
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}
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print "The CD contains:{$myCD->getTrackList()}\n";
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/**
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* 需求发生小变化： 要求每个输出的参数都采用大写形式. 对于这么小的变化而言， 最佳的做法并非修改基类或创建父 - 子关系，
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* 而是创建一个基于装饰器设计模式的对象。
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*
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*/
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class CDTrackListDecoratorCaps {
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private $_cd;
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public function __construct(CD $cd) {
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$this->_cd = $cd;
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}
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public function makeCaps() {
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foreach ($this->_cd->trackList as & $track) {
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$track = strtoupper($track);
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}
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}
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}
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$myCD = new CD();
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foreach ($tracksFroExternalSource as $track) {
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$myCD->addTrack($track);
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}
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//新增以下代码实现输出参数采用大写形式
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$myCDCaps = new CDTrackListDecoratorCaps($myCD);
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$myCDCaps->makeCaps();
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print "The CD contains:{$myCD->getTrackList()}\n";

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