Dirty Mixed PHP7 & PHP8

demo-7x8x-mixed.php

<?php
declare(strict_types=1);

/**
 * PHP8
 *  add : https://php.watch/versions/8.0/union-types
 */

class SimpleMath
{
    #[PHP8] private int|float $inline_num; /*
    private $inline_num; /* PHP<8 */

    #[PHP8] public function setNum(int|float $num): void { /*
    public function setNum($num): void { /* PHP<8 */
        $this->inline_num = $num;
    }

    #[PHP8] public function squareAndAdd(int|float $num): int|float { /*
    public function squareAndAdd($num) { /* PHP<8 */
        return $num ** 2 + $this->inline_num;
    }
}

$simple = new SimpleMath();

$simple->setNum(1);

echo $simple->squareAndAdd(1.2) . PHP_EOL;

Wow, it's workable.

I change a bit and let setNum have different default value.
Test with different version it will return 9.44 or 8.44

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curl https://gist.githubusercontent.com/HillLiu/fa84bc3327cdccc248c5484f4df05755/raw/a8c6ae3e5ed9473d04432423182c79f7e36ebf4c/demo-7x8x-mixed.php | docker run --rm -i hillliu/pmvc-phpunit:8.1 php

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curl https://gist.githubusercontent.com/HillLiu/fa84bc3327cdccc248c5484f4df05755/raw/a8c6ae3e5ed9473d04432423182c79f7e36ebf4c/demo-7x8x-mixed.php | docker run --rm -i hillliu/pmvc-phpunit:7.4 php