Storing and retrieving $_SESSION variables - php

Question

I've got a problem. I'm sure I'm being really stupid but I can't seem to be able to rertive a $_SESSION variable. I run throught the code with a variable called $setup which I post each time as reset. Each time I run through the code I increment $setup so it starts off with no value then has the value 1 and then then value 2. When it's one, I set a SESSION to a posted value. The next time when it's two, the SESSION doesn't seem to have a value.
This is the code when the page is loaded:
<?php
session_start();
$setup=$_POST['reset'];
if ($setup==NULL)
{
$setup=0;
}
elseif ($setup==1)
{
$_SESSION['value1']=$_POST['value1'];
$value1=$_SESSION['value1'];
}
elseif ($setup==2)
{
$value1=$_SESSION['value1'];
$_SESSION['value2']=$_POST['value2'];
$value2=$_SESSION['value2'];
}
?>
When setup is one I can print out value1 however when setup is two is use this code
echo $value2 . " " . $value1 . ".";
All I get is value2 followed by a dot. Am I doing something wrong here?

Answer 1

In this part of your code :
elseif ($setup==2)
{
$value1=$_SESSION['value1'];//HERE
$_SESSION['value2']=$_POST['value2'];
$value2=$_SESSION['value2'];
}
$_SESSION['value1'] is empty so $value1 will be empty too , instead of this i suggest this code:
elseif ($setup==2)
{
if(isset($_SESSION['value1']) $value1=$_SESSION['value1'];
else $value1='Some value for test';
$value2=$_SESSION['value2'];
}
ALSO:
echo $value2 . " " . $value1 ".";
Should be :
echo $value2 . " " . $value1 . ".";//if you want dot in the end
or :
echo $value2 . " " . $value1 ;//without dot int end of line

Answer 2

<?php
session_start();
if (!isset($_POST['reset'])) {
// do nothing or something more useful
}
else {
if ($_POST['reset'] == 1) {
$value1 = $_SESSION['value1'] = $_POST['value1'];
}
elseif ($_POST['reset'] == 2) {
$value1 = $_POST['value1']; // $_POST !!! Not $_SESSION['value1'], which is not set here!
$value2 = $_SESSION['value2'] = $_POST['value2'];
}
}
?>
$value1=$_SESSION['value1']; // you can't do this here ( == 2), because you did not set $_SESSION['value1'] to anything before

Answer 3

It depends on what you want to echo.
Example:
$value1 = "hello";
$value2 = "Richard";
echo $value1." ".$value2;
// will output "hello Richard" (Without the quotes)
//using your code (and syntax corrected)
echo $value1." ".$value2.".";
// will output "hello Richard." (Without the quotes)
If you want the dot to be echoed, you need to surround it with quotes "", and to break in and out of PHP vars/text etc in an echo as above.

Answer 4

You forgot a concatenating dot before "." string
Should be:
echo $value2 . " " . $value1 . ".";

Answer 5

I've fixed it. I has a reset button at the bottom to destroy the session and it had PHP in it. Maybe this question will help anyone else who make this mistake. I can happen.