GeometricShape

<?php
declare(strict_types=1);

interface GeometricShape
{
    public function getArea(): float;
    public function getPerimeter(): float;
}


class Rectangle implements GeometricShape
{
    public function __construct(public float $length, public float $width)
    {
        ($length > 0 && $width > 0)
        or throw new ValueError('Length/width invalid');
    }


    public function getArea(): float
    {
        $result = $this->length * $this->width;

        is_finite($result)
        or throw new ValueError('Result is infinite');

        return $result;
    }


    public function getPerimeter(): float
    {
        $result = ($this->length + $this->width) * 2;

        is_finite($result)
        or throw new ValueError('Result is infinite');

        return $result;
    }
}


class Circle implements GeometricShape
{
    public function __construct(public float $radius)
    {
        $radius > 0
        or throw new ValueError('Radius invalid');
    }


    public function getArea(): float
    {
        $result = ($this->radius * $this->radius) * pi();

        is_finite($result)
        or throw new ValueError('Result is infinite');

        return $result;
    }


    public function getPerimeter(): float
    {
        $result = ($this->radius * 2) * pi();

        is_finite($result)
        or throw new ValueError('Result is infinite');

        return $result;
    }
}


$eol = empty($argc) ? '<br>' : PHP_EOL;  // determine end of line


/* create shapes */
$circle = new Circle(radius: 6);
$rectangle = new Rectangle(width: 3.5, length: 12.7);


/* output details about each shape */
foreach ([$rectangle, $circle] as $shape) {
    $argsList = '';
    foreach (get_object_vars($shape) as $name => $value) {
        $argsList .= "$name: $value ";
    }

    printf('%s - %s' . $eol .
           ' Area: %s' . $eol .
           ' Perimeter: %s' . $eol . $eol,
           get_class($shape), $argsList,
           round($shape->getArea(), 3),
           round($shape->getPerimeter(), 3));
}