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多態(tài)是面向?qū)ο缶幊讨械闹匾拍?,它允許不同的對(duì)象對(duì)同一個(gè)方法做出不同的響應(yīng)。在PHP中,多態(tài)可以通過繼承和接口來實(shí)現(xiàn)。
以下是一些PHP多態(tài)面向?qū)ο缶幊痰母呒?jí)實(shí)踐:
interface Shape {
public function area();
}
class Circle implements Shape {
private $radius;
public function __construct($radius) {
$this->radius = $radius;
}
public function area() {
return pi() * pow($this->radius, 2);
}
}
class Rectangle implements Shape {
private $width;
private $height;
public function __construct($width, $height) {
$this->width = $width;
$this->height = $height;
}
public function area() {
return $this->width * $this->height;
}
}
class Animal {
public function speak() {
echo "Animal speaks";
}
}
class Dog extends Animal {
public function speak() {
echo "Dog barks";
}
}
class Cat extends Animal {
public function speak() {
echo "Cat meows";
}
}
$animals = [new Dog(), new Cat()];
foreach ($animals as $animal) {
$animal->speak();
}
function calculateArea(Shape $shape) {
return $shape->area();
}
$circle = new Circle(5);
$rectangle = new Rectangle(3, 4);
echo calculateArea($circle) . "\n";
echo calculateArea($rectangle) . "\n";
通過以上高級(jí)實(shí)踐,可以更好地利用PHP的面向?qū)ο缶幊烫匦?,?shí)現(xiàn)更靈活和可擴(kuò)展的代碼結(jié)構(gòu)。
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