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<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "sklep";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT id, nazwa, opis, cena FROM podzespoly";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "<th>" . $row["id"]. "</th><th>" . $row["nazwa"]. "</th>
        <th>" . $row["opis"]. "</th><th>"  . $row["cena"]. "</th></tr>" ;
    }
} else {
    echo "0 results";
}
$conn->close();
?>