php 组件编程

1.利用组件编程模式，防止冗余

<?phpclass Action {  private $name;  public function __construct($name) {    $this->name = $name;  }  public function eat($food) {    echo $this->name . " eat ". $food . ".\n";  }}class Gender {  private $gender;  public function __construct($gender) {    $this->gender= $gender;  }  public function getGender() {    return $this->gender;  }}class BullWhale {  private $action;  private $gender;  public function __construct() {    $this->action = new Action("Bull Whale");    $this->gender = new Gender("Male");  }  public function eatFood($food) {    $this->action->eat($food);  }  public function getGender() {    return $this->gender->getGender();  }}$bullWhale = new BullWhale();$bullWhale->eatFood("fish");echo $bullWhale->getGender() . "\n";

结果

Bull Whale eat fish. Male

BullWhale由Action和Gender组件构成，不同的类可以选择不同的组件组合，这样就不会造成类冗余了。