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@ 2022-12-14T12:30:57Z

<?php

trait CalculatesArea
{
    private $pi = 3.1416;
    
    private function rectangularArea(): float
    {
       return $this->a * $this->b;
    }
    
    private function ellipticArea(): float
    {
       return $this->a * $this->b * $this->pi;
    }
}

abstract class Shape
{
    use CalculatesArea;
    
    public function __construct(protected float $a, protected float $b) {}

    public function area(): ?float
    {
        if ($this instanceof Rectangle) {
            return $this->rectangularArea();
        }
        
        if ($this instanceof Ellipse) {
            return $this->ellipticArea();
        }
        
        return null;
    }
}

class Rectangle extends Shape {}

class Ellipse extends Shape {}

var_dump(
    (new Rectangle(3, 4))->area(),
    (new Ellipse(1.3, 3.8))->area(),
);

Output for 8.1.23 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: float(12) float(15.519503999999998)
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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