PHP面向对象和面向过程的区别详解

// 定义一个函数来计算圆形的面积
function calculateCircleArea($radius) {
    return 3.14 * $radius * $radius;
}
// 定义一个函数来计算矩形的面积
function calculateRectangleArea($length, $width) {
    return $length * $width;
}
// 计算圆形的面积
$radius = 5;
$circleArea = calculateCircleArea($radius);
echo "圆形的面积：" . $circleArea . "\n";
// 计算矩形的面积
$length = 4;
$width = 6;
$rectangleArea = calculateRectangleArea($length, $width);
echo "矩形的面积：" . $rectangleArea . "\n";

// 定义一个图形的抽象类
abstract class Shape {
    protected $name;
    
    public function __construct($name) {
        $this->name = $name;
    }
    
    abstract public function calculateArea();
    
    public function getName() {
        return $this->name;
    }
}
// 定义一个圆形类
class Circle extends Shape {
    private $radius;
    
    public function __construct($name, $radius) {
        parent::__construct($name);
        $this->radius = $radius;
    }
    
    public function calculateArea() {
        return 3.14 * $this->radius * $this->radius;
    }
}
// 定义一个矩形类
class Rectangle extends Shape {
    private $length;
    private $width;
    
    public function __construct($name, $length, $width) {
        parent::__construct($name);
        $this->length = $length;
        $this->width = $width;
    }
    
    public function calculateArea() {
        return $this->length * $this->width;
    }
}
// 创建一个圆形对象
$circle = new Circle("圆形", 5);
echo $circle->getName() . "的面积：" . $circle->calculateArea() . "\n";
// 创建一个矩形对象
$rectangle = new Rectangle("矩形", 4, 6);
echo $rectangle->getName() . "的面积：" . $rectangle->calculateArea() . "\n";