PHP 使用抽象 class 还是接口？

Question

在这段代码中，使用抽象类代替接口更好，还是像现在这样好？如果是，为什么？

/** contract for all flyable vehicles **/
interface iFlyable {
    public function fly();
}

/* concrete implementations of iFlyable interface */
class JumboJet implements iFlyable {
    public function fly() {
        return "Flying 747!";
    }
}

class FighterJet implements iFlyable {
    public function fly() {
        return "Flying an F22!";
    }
}

class PrivateJet implements iFlyable {
    public function fly() {
        return "Flying a Lear Jet!";
    }
}

/** contract for conrete Factory **/
/**
* "Define an interface for creating an object, but let the classes that implement the interface
* decide which class to instantiate. The Factory method lets a class defer instantiation to
* subclasses."
**/
interface iFlyableFactory {
    public static function create( $flyableVehicle );
}

/** concrete factory **/
class JetFactory implements iFlyableFactory {
    /* list of available products that this specific factory makes */
    private  static $products = array( 'JumboJet', 'FighterJet', 'PrivateJet' );

    public  static function create( $flyableVehicle ) {
        if( in_array( $flyableVehicle, JetFactory::$products ) ) {
            return new $flyableVehicle;
        } else {
            throw new Exception( 'Jet not found' );
        }
    }
}

$militaryJet = JetFactory::create( 'FighterJet' );
$privateJet = JetFactory::create( 'PrivateJet' );
$commercialJet = JetFactory::create( 'JumboJet' );

Answer 1

界面更加灵活。这样，并不是所有会飞的东西都被迫从同一个基础继承class（php不支持多重继承）

所以

class bird extends animal implements flyable
class plane extends machine implements flyable
class cloud implements flyable

有时不需要灵活性。

抽象 classes 还可以提供函数定义，如果多个飞行 classes 需要相同的 fly() 方法，这将减少代码重复

希望能帮助您理解您的选择

PHP 使用抽象 class 还是接口？

PHP use abstract class or interface?

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