/////////////////spajanje na bazu
<?php


$server = "localhost";
$username = "root";
$password = "";
$dbname= "autoradionica";

$conn = mysqli_connect($server, $username, $password, $dbname) or die("Nemogu se spojit");
mysqli_set_charset($conn,"utf8");
$sql = "SELECT ime, prezime FROM radnik";

$query = mysqli_query($conn, $sql);

while($row=mysqli_fetch_array($query)){
echo "<tr><td>".$row["ime"].".".$row["prezime"]."@autoradionica.com</td></tr>";
}

mysqli_close($conn);
?>

//////////////PREPARED STATEMENT

$conn = mysqli_connect($server, $username, $password, $datbase) or die("Kill the Kardashians");

$stmt = $conn->prepare("INSERT INTO kvar (sifKvar, nazivKvar, sifOdjel, brojRadnika, satiKvar) VALUES(?, ?, ?, ?, ?)");
$stmt->bind_param("isiii", $sifKvar, $nazivKvar, $sifOdjel, $brojRadnika, $satiKvar);

$sifKvar = $_POST["sifKvar"];
$nazivKvar = $_POST["nazivKvar"];
$sifOdjel = $_POST["sifOdjel"];
$brojRadnika = $_POST["brojRadnika"];
$satiKvar = $_POST["satiKvar"];

$stmt->execute();

////////////////FORMA

<form method="POST" action="#">
<input name="postanskiBroj" placeholder="postanskiBroj"><br>
<button name="submit" type="submit">Posalji</button>
</form>