<?php class Math { public $v; public $vi; public $a; public $s; public $t; function mars($v, $t, $a) { $s = $v * $t + 0.5 * $a * $t * $t; echo $s . "<br>"; } function __destruct() { echo "yooooooooooooo"; } } $physics = new Math(); $physics->mars(10, 10, 0); $physics->mars(0, 5, 10); $physics->mars(10, 2, -5);