裝飾模式：

<?php
abstract class Tile {
  abstract function getWealthFactor();
}
class Plains extends Tile {
  private $wealthfactor = 2;
  function getWealthFactor() {
    return $this->wealthfactor;
  }
}
abstract class TileDecorator extends Tile { // 裝飾
  protected $tile;
  function __construct( Tile $tile ) {
    $
 
this->tile = $tile;
  }
}
class DiamondDecorator extends TileDecorator { // 鉆石裝飾
  function getWealthFactor() {
    return $this->tile->getWealthFactor()+2;
  }
}
class PollutionDecorator extends TileDecorator { // 汙染裝飾
  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
?>

組合模式：

<?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; // 克隆軍隊
$army->addArmy( $army2 );
print $army->bombardStrength();
print "\n";
?>

工廠模式

 <?php
     /**
      * 操作類
      * 因為包含有抽象方法，所以類必須聲明為抽象類
      */
     abstract class Operation{
         //抽象方法不能包含函數體
         abstract public function getValue($num1,$num2);//強烈要求子類必須實現該功能函數
     }
     /**
      * 加法類
      */
     class OperationAdd extends Operation {
         public function getValue($num1,$num2){
             return $num1+$num2;
         }
     }
     /**
      * 減法類
      */
     class OperationSub extends Operation {
         public function getValue($num1,$num2){
             return $num1-$num2;
         }
     }
     /**
      * 乘法類
      */
     class OperationMul extends Operation {
         public function getValue($num1,$num2){
             return $num1*$num2;
         }
     }
     /**
      * 除法類
      */
     class OperationDiv extends Operation {
         public function getValue($num1,$num2){
             try {
                 if ($num2==0){
                     throw new Exception("除數不能為0");
                 }else {
                     return $num1/$num2;
                 }
             }catch (Exception $e){
                 echo "錯誤信息：".$e->getMessage();
             }
         }


    /**
     * 工廠類，主要用來創建對象
     * 功能：根據輸入的運算符號，工廠就能實例化出合適的對象
     *
     */
    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常用設計模式匯總