Check the table

<?php
    $servername = "localhost";
    $username = "YUN";
    $password = "xxx";
    $dbname = "TestnaBaza";

    // naredi povezavo
    $conn = mysqli_connect($servername, $username, $password, $dbname);
    //preveri povezavo
    if (!$conn){
        die ("Povezava ni uspela" .mysqli_connect_error());
    }

    $sql = "SELECT id, temperatura, datum FROM YunPodatki";
    $result = mysqli_query($conn, $sql);

    if (mysqli_num_rows($result) > 0) {
        // izhodni podatki vsake vrstice
        while ($row = mysqli_fetch_assoc($result)){
            echo "id".$row["id"]. "Temperatura" . $row["temperatura"] . "Datum" . $row["datum"] . "<br>";
        }
    } else {
        echo "0 rezultatov";

    }

    mysqli_close($conn);
    ?>