I am totally confused with session variables. I thought that if I set a session variable, then that variable will be available in any php document that begins with session_start. But it's not working.
Form:
<?php
session_start();
if(isset($_POST['hour'])) {
$_SESSION['hour'] = $_POST['hour'];
}
?>
<!DOCTYPE html>
<html>
<body>
<form action='viewA.php' method='post'>
<input type="text" name='hour' value='24'>
<input type ='submit' name= 'submit' value='submit'>
</form>
</body>
</html>
I post to viewA.php, and it works:
<?php
$hour = $_POST['hour'];
echo 'I am view A, and hour is '.$hour;
?>
<html>
<a href='View_B.php'>See View B</a>
<a href='TEST_form.php' >Choose another hour</a>
</html>
The file viewA.php has a link to View_B.php; here's View_B's code:
<?php
session_start();
print_r($_SESSION);
//$hour = $_SESSION['hour'];
//echo '... and in view B, hour is '.$hour;
?>
<html>
<a href='aatestform.php' >Choose another hour</a>
</html>
No matter what I put into the input in the form, the print_r($_SESSION); View_B outputs only Array ( [hour] => 13 ), which is the first hour I chose way back when. I type in "22"; it outputs 13. I type in "08", it outputs 13.
According to w3schools, "To change a session variable, just overwrite it"
What am I doing wrong? Please help!
In your viewA.php you don't store / overwrite the session variable with the $_POST value.
You just do it in your TEST_form.php which doesn't get any $_POST so your if(isset(... is useless.
Your post destination (the action) is viewA.php, this means that your request will be made to viewA.php.
You're using session variabiles only in the form page and in View_B.php.
If you look carefully at your code in ViewA.php, you'll see that you're working only with POST variables, not session variables.
This php code, that you have in your form page
<?php
session_start();
if(isset($_POST['hour'])) {
$_SESSION['hour'] = $_POST['hour'];
}
?>
Should be moved to viewA.php. Doing this, viewA.php will check if the POST variable "hours" is set. In that case, it overwrite (or create) the session variable "hours".