telephone directory update issue - php

Question

I was programming something and I faced the problem. I was wondering where is the problem, because my code stop working after mysql_query("UPDATE ...") part. Here is the code, I hope someone will help me.
<?php include("/includes/template/header.php"); ?>
<section>
<form action="" method="post">
<input type="post" name="ime" placeholder="Ime"><br>
<input type="post" name="prezime" placeholder="Prezime"><br>
<input type="post" name="broj" placeholder="Broj telefona"><br>
<input type="post" name="adresa" placeholder="Adresa"><br>
<input type="submit" name="submit" value="Trazi">
</form>
<?php
include("includes/config.php");
if(isset($_POST['submit']))
{
if(!empty($_POST['ime']) && !empty($_POST['prezime']))
{
$trazeno_ime = $_POST['ime'];
$trazeno_prezime = $_POST['prezime'];
$query = "SELECT id, broj_telefona, adresa FROM korisnici WHERE ime = '$trazeno_ime' AND prezime='$trazeno_prezime'";
if ($query_run = mysql_query($query))
{
if(mysql_num_rows($query_run)!=NULL)
{
$query_row = mysql_fetch_assoc($query_run);
$id = $query_row["id"];
$brojtel = $query_row["broj_telefona"];
$adresa = $query_row["adresa"];
echo "<form action=\"\" method=\"post\">";
echo "<input type=\"post\" name=\"ime1\" value=\"$trazeno_ime\"><br></br>";
echo "<input type=\"post\" name=\"prezime1\" value=\"$trazeno_prezime\"><br></br>";
echo "<input type=\"post\" name=\"broj1\" value=\"$brojtel\"><br></br>";
echo "<input type=\"post\" name=\"adresa1\" value=\"$adresa\"><br></br>";
echo "<input type=\"submit\" name=\"submit1\" value=\"Promijeni\">";
echo "</form>";
if(isset($_POST['submit1']))
{
if(!empty($_POST['ime1']) && !empty($_POST['prezime1']) && !empty($_POST['broj1']) && !empty($_POST['broj1']) && !empty($_POST['adresa']))
{
$novoime = $_POST['ime1'];
$novoprezime = $_POST['prezime1'];
$novobroj = $_POST['broj1'];
$novoadresa = $_POST['adresa1'];
mysql_query("UPDATE korisnici SET ime='$novoime', prezime='$novoprezime', broj_telefona='$novobroj', adresa='$novoadresa' WHERE id=$id") or die(mysql_error());
echo "Uspješno promijenjeni podaci";
}
else
{
echo "Morate unijeti sva polja";
}
}
else
{
echo "Glupost";
}
}
else
{
echo "Nema korisnika u bazi";
}
}
else
{
echo "Hahu";
}
}
else
{
echo "Unesi podatke";
}
}
?>
</section>
</div>
</body>

Answer 1

You need to add quotes to your id statement see below.
"UPDATE korisnici SET ime='$novoime', prezime='$novoprezime', broj_telefona='$novobroj', adresa='$novoadresa' WHERE id='$id'"