$_get and session. Can't get it to work - php

Question

Can anyone tell me why this doesn't work?
<?php
$lang = $_get["lang"];
if (($lang == "fr"))
{
session_destroy();
session_start();
$_SESSION['lang'] == "fr";
}
if (($lang == "en"))
{
session_destroy();
session_start();
$_SESSION['lang'] == "en";
}
if (isset($_SESSION['lang']))
{
$lang = $_SESSION['lang'];
}
else
{
$lang = "fr";
}
?>
I just can't seem to get it to work and I tried a lot of different things. Just need a direction to the mistake.
It's running on PHP5 on an Apache server if that's any help.
Even without the session I can't even get the $_get to work. With normally is never the case.

Answer 1

$_SESSION['lang'] == "fr";
two equal signs mean comparision operator.
assignment is = (one equal)

Answer 2

One obvious thing is
$_get["lang"];
Variables are case sensitive in PHP. It must be
$_GET["lang"];
if that doesn't solve your problem, you need to describe in detail what exactly doesn't work.

Answer 3

I have re-factored your code to make it easier to work with in the future. As Pekka says and I asked perhaps you need/want $_GET.
<?php
session_start();
$language = $_GET['lang'];
$allowable_languages = array(
'en',
'fr',
);
if(in_array($language, $allowable_languages)) {
$_SESSION['lang'] = $language;
} else {
$_SESSION['lang'] = 'fr';
}
?>
Updated: In answer to your comment:
<?php
session_start();
if(isset($_GET['lang'])) {
$language = $_GET['lang'];
$allowable_languages = array(
'en',
'fr',
);
if(in_array($language, $allowable_languages)) {
$_SESSION['lang'] = $language;
}
}
if(!isset($_SESSION['lang'])) {
$_SESSION['lang'] = 'fr';
}
?>

Answer 4

U just made a single mistake i.e, u are using wrong syntax it should be $_GET['lang'];

Answer 5

Your code doesn't work because session_start() can't be used directly after session_destroy(). Btw, you don't need to destroy session. Just redefine your variable:
$lang = 'fr';
if(isset($_GET['lang']) && in_array($_GET['lang'], array('fr', 'en'))) $lang = $_GET['lang'];
$_SESSION['lang'] = $lang;
For those who thinks the problem is lower case variable - PHP variables are case insensitive.

Answer 6

You are both right. There was a lot of different error. Both the "=" and "==" problem plus the $_GET case sensitive problem.
Here the code i god to work both the $_GET plus the session.
Thanks a lot. I've spend all night trying to find those error plus think i got errorblind.
<?php
$lang = $_GET["lang"];
if (($lang == "fr"))
{
session_destroy();
session_start();
$_SESSION['lang'] = "fr";
}
if (($lang == "en"))
{
session_destroy();
session_start();
$_SESSION['lang'] = "en";
}
if (isset($_SESSION['lang']))
{
$lang = $_SESSION['lang'];
}
else {
$lang = "fr";
}
?>