<?php
$dbname='wynajem';
$username='root';
$pass="";
$servername="localhost";
$conn= new mysqli($servername, $username, $pass, $dbname);
$sql="SELECT samochody.id, samochody.model, zamowienia.telefon from samochody, zamowienia WHERE samochody.id = zamowienia.Samochody_id;";
$result = $conn->query($sql);
while ($row=$result->fetch_array())
echo $row['id']. ' ' .$row['model']. ' ' .$row['telefon'].  ' <br>'
?>