PHP IF Else Function Not Working - php

Question

I have a problem, I can't get the result of my code. When I try to debug the code. I using IF statement in my code.
It's just simple, example : if kelas(based on user_id login) = 1, then redirect it to kelas1.php, if kelas = 2, the redirect to kelas 2, else no have a kelas.
Here it's my code :
<?php
session_start();
if(!isset($_SESSION['user_id'])) {
header('Location: form_login_siswa.html');
}
$user_id = $_SESSION['user_id'];
include ("config.php");
$query = "SELECT kelas FROM t_siswa WHERE user_id = '$user_id'";
$hasil = mysql_query($query);
while ($data = mysql_fetch_array($hasil)) {
$kelas = $data['kelas'];
if($kelas = 1) {
include ("kelas1.php");
}
if($kelas = 2) {
include ("kelas2.php");
} else {
echo "Tidak ada kelas";
}
}
?>
Anyone, please help to solve the problem.
Appreciated with your helps.
Thank you.

Answer 1

You're missing an else and also not using the correct operator for comparison.
Also, switch around the comparison so that the first value is always a valid value.
if(1 == $kelas)
{
include ("kelas1.php");
}
else if(2 == $kelas)
{
include ("kelas2.php");
}
else
{
echo "Tidak ada kelas";
}

Answer 2

$kelas = 1
is assignment
$kelas == 1
is comparison

Answer 3

if($kelas = 1)
should be
if($kelas == 1)

Answer 4

Try using == instead of = . The "=" is an assignment operator and the expression gets the value of the right operand.
if($kelas == 1)
{
include ("kelas1.php");
}
if($kelas == 2)
{
include ("kelas2.php");
}
else
{
echo "Tidak ada kelas";
}
Also, the statement will always echo "Tidak ada kelas"; if ($kelas == 1). Was this intentional?

Answer 5

In your if statements using == for testing comparison rather than single = which is for assignment

Answer 6

Take a look at the elsif structure.
while ($data = mysql_fetch_array($hasil)) {
$kelas = $data['kelas'];
if($kelas == 1) {
include ("kelas1.php");
} elseif($kelas == 2) {
include ("kelas2.php");
} else {
echo "Tidak ada kelas";
}
}
Or the switch structure:
while ($data = mysql_fetch_array($hasil)) {
switch($data['kelas']){
case 1:
include ("kelas1.php");
break;
case 2:
include ("kelas2.php");
break;
default:
echo "Tidak ada kelas";
}
}