immutable, not hackable by the __construct()

imu.php

<?php
class imu
{
    /**
     * @var float
     */
    private $one;

    /**
     * @var float
     */
    private $two;

    private function __construct(float $one, float $two)
    {
        $this->one = $one;
        $this->two = $two;
    }

    public static function createFromFloats(float $one, float $two): self
    {
        return new static($one, $two);
    }

    public function __toString()
    {
        return sprintf("one : %f & two : %f", $this->one, $this->two);
    }
}

$imu = imu::createFromFloats(5.0, 0.0);
echo $imu;

final class imu serait mieux.