<?php
abstract class Tile {abstract function getWealthFactor();
}
class Plains extends Tile {private $wealthfactor = 2;function getWealthFactor() {return $this->wealthfactor;}
}
abstract class TileDecorator extends Tile { // 装饰protected $tile;function __construct( Tile $tile ) {$this->tile = $tile;}
}
class DiamondDecorator extends TileDecorator { // 钻石装饰
  function getWealthFactor() {return $this->tile->getWealthFactor()+2;}
}
class PollutionDecorator extends TileDecorator { // 污染装饰
  function getWealthFactor() {return $this->tile->getWealthFactor()-4;}
}
$tile = new Plains();
print $tile->getWealthFactor(); // 2
$tile = new DiamondDecorator( new Plains());
print $tile->getWealthFactor(); // 4
$tile = new PollutionDecorator( new DiamondDecorator( new Plains()));
print $tile->getWealthFactor(); // 0
?>

<?php
abstract class Unit {abstract function bombardStrength();
}
class Archer extends Unit {function bombardStrength() {return 4;}
}
class LaserCannonUnit extends Unit {function bombardStrength() {return 44;}
}
class Army {private $units = array();private $armies= array();function addUnit( Unit $unit ) {array_push( $this->units, $unit );}function addArmy( Army $army ) {array_push( $this->armies, $army );}function bombardStrength() {$ret = 0;foreach( $this->units as $unit ) {$ret += $unit->bombardStrength();}foreach( $this->armies as $army ) {$ret += $army->bombardStrength();}return $ret;}
}
$unit1 = new Archer();
$unit2 = new LaserCannonUnit();
$army = new Army();
$army->addUnit( $unit1 );
$army->addUnit( $unit2 );
print $army->bombardStrength();
print "\n";
$army2 = clone $army; // 克隆军队
$army->addArmy( $army2 );
print $army->bombardStrength();
print "\n";
?>

 <?php/*** 操作类* 因为包含有抽象方法，所以类必须声明为抽象类*/abstract class Operation{//抽象方法不能包含函数体abstract public function getValue($num1,$num2);//强烈要求子类必须实现该功能函数
     }/*** 加法类*/class OperationAdd extends Operation {public function getValue($num1,$num2){return $num1+$num2;}}/*** 减法类*/class OperationSub extends Operation {public function getValue($num1,$num2){return $num1-$num2;}}/*** 乘法类*/class OperationMul extends Operation {public function getValue($num1,$num2){return $num1*$num2;}}/*** 除法类*/class OperationDiv extends Operation {public function getValue($num1,$num2){try {if ($num2==0){throw new Exception("除数不能为0");}else {return $num1/$num2;}}catch (Exception $e){echo "错误信息：".$e->getMessage();}}/*** 工厂类，主要用来创建对象* 功能：根据输入的运算符号，工厂就能实例化出合适的对象**/class Factory{public static function createObj($operate){switch ($operate){case '+':return new OperationAdd();break;case '-':return new OperationSub();break;case '*':return new OperationSub();break;case '/':return new OperationDiv();break;}}}$test=Factory::createObj('/');$result=$test->getValue(23,0);echo $result;
?>

<?php  /**
* Singleton of Database
*/
class Database
{  // We need a static private variable to store a Database instance.
  privatestatic $instance;  // Mark as private to prevent it from being instanced.  private function__construct()  {  // Do nothing.
  }  private function__clone()   {  // Do nothing.
  }  public static function getInstance()   {  if (!(self::$instanceinstanceofself)) {  self::$instance = newself();  }  returnself::$instance;  }
}  $a =Database::getInstance();
$b =Database::getInstance();  // true
var_dump($a === $b);  

<?php
interface FlyBehavior{public function fly();
}class FlyWithWings implements FlyBehavior{public function fly(){echo "Fly With Wings \n";}
}class FlyWithNo implements FlyBehavior{public function fly(){echo "Fly With No Wings \n";}
}
class Duck{private $_flyBehavior;public function performFly(){$this->_flyBehavior->fly();}public function setFlyBehavior(FlyBehavior $behavior){$this->_flyBehavior = $behavior;}
}class RubberDuck extends Duck{
}
// Test Case
$duck = new RubberDuck();/*  想让鸭子用翅膀飞行 */
$duck->setFlyBehavior(new FlyWithWings());
$duck->performFly();            /*  想让鸭子不用翅膀飞行 */
$duck->setFlyBehavior(new FlyWithNo());
$duck->performFly();?>

class User {      private $name;      function __construct($name) {      $this->name = $name;      }      public function getName() {      return $this->name;      }      }
//新代码，开放平台标准接口      interface UserInterface {      function getUserName();      }      class UserInfo implements UserInterface {      protected $user;      function __construct($user) {      $this->user = $user;      }      public function getUserName() {      return $this->user->getName();      }      }
$olduser = new User('张三');      echo $olduser->getName()."n";      $newuser = new UserInfo($olduser);      echo $newuser->getUserName()."n";