<?php

$host = "localhost";
$db_user = "root";
$db_password = "";
$db_name = "samochody";

$id=$_POST['id'];

$polaczenie = @new mysqli($host, $db_user, $db_password, $db_name);




$delete = "DELETE FROM auta WHERE id_car=$id";

if ($polaczenie->query($delete) === TRUE) {
    echo "Usunięto rekord o nr. id ". $id ;
} else {
    echo "Error: " . $delete . "<br>" . $polaczenie->error;
}

?>