<body> <?php //设计模式：工厂模式 /* class YunSuan { public $a; public $b; function Jia() { return ($this->a+$this->b); } function Jian() { return ($this->a-$this->b); } function Cheng() { return ($this->a*$this->b); } function Chu() { return ($this->a/$this->b); } function Yu() { return ($this->a%$this->b); } } $y = new YunSuan(); $y->a = 10; $y->b = 5; echo $y->Jia();*/ //造父类，用子类继承 class YunSuan { public $a; public $b; function YunSuan() { } } //加法的子类 class Jia extends YunSuan { function YunSuan() { return ($this->a+$this->b); } } //减法的子类 class Jian extends YunSuan { function YunSuan() { return ($this->a-$this->b); } } $y = new Jian(); $y->a = 10; $y->b = 5; //echo $y->YunSuan(); //再优化，工厂类 class GongChang { static function DuiXiang($f) { switch($f) { case "+": return new Jia(); break; case "-": return new Jian(); break; case "*": return new Cheng(); break; } } } $r = GongChang::DuiXiang("-"); $r->a=10; $r->b = 5; echo $r->YunSuan(); /* class Suan { public $total; function Jia($a) { $this->total = $this->total+$a; return $this->total; } function Jian($a) { $this->total = $this->total-$a; } }*/ ?> </body> </html>