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function.session-start is displaying on sign-in-action page with other correct links why so and how to check session for sign-in-action-form

Answer 1

+1 A:

From the documentation:

Note: To use cookie-based sessions, session_start() must be called before outputing anything to the browser.

Make sure to put session_start() before any output.
You can always create a session whether the user logs in or not. If he logs in then, you just set some flag in the session variables to mark him as logged in (and probably regenerate the session key for security reasons).

<?php 
session_start()

// do all the user authentication here

$_SESSION['user_authenticated'] = true;

// maybe more stuff....
?>

<!-- html stuff -->
<body>
<?php if($_SESSION['user_authenticated']) {
      echo "<font color=red>"."<h3 align=center>"."Welcome ".$_SESSION['employee']['username']."</h3>"."</font>";
      echo "<br />"."<a href='upload_file.php'>"."<font color='white'>"."<h4>"."Up-Load Files"."</h4>"."<font>"."</a>";
      echo "<br />"."<br />"."<a href='list_files.php'>"."<font color='white'>"."<h4>"."List All Up-Loaded Files"."</h4>"."<font>"."</a>"
} ?>

<!-- and so on -->

This is more or less pseudo code but it should give you the right idea.

Felix Kling 2010-01-26 09:08:14

from ur post i just came to know that i should place sesion start on the first line of the page even in sign-in action page..i dont know anything about flegs i just statrted php..so plz elaborate things plz.

Deepak Narwal 2010-01-26 09:57:07

now the problem of displaying function.session-start is overcome.NOw no such function is displaying,but by putting session_start() on first line of sign-in-action-form one problem is created.Every time when i want to go back on this apge from any other page an allert msj comes do u wnat to send request or cancel so when i press re-send then i will move to that page..why so..

Deepak Narwal 2010-01-26 10:32:14

Well this is standard behavior in browsers when you want to go back to a page where you sent post data before.

Felix Kling 2010-01-26 15:59:17

With flag I mean just a variable that just say whether the user is logged in or not.

Felix Kling 2010-01-26 16:00:07

@felixbut this behaviour is not for other links why only for sign-in-action page..in this page i have upload link and in upload i have list file link..so when i move signactionpage->upload->list and then try to come back then this resend alert box is not appered why only for when i move from upload->signinaction..plz check i have placed session_start on the top og this file(in very first line)

Deepak Narwal 2010-01-26 17:30:26

As I said it is this way because you send your login data to `signinaction`. So if you go back to this page (i.e. going back after one page) it ask if you want to resend that data again. You can read about it e.g. http://www.thefutureoftheweb.com/blog/get-redirect-after-post . Please use upper case characters were appropriate, it makes your comments easier to read.

Felix Kling 2010-01-26 17:38:05

@felixOk fine now i am getting the point.But there is one more problem.Suppose i am on signin-action page which have a link of sign out.When i click on sign out button i am re-directed to sign in page.ok no problem but again if i press back button again i am asked to resend the data(even after sign out) and again i am on sign-in-action page why so..It is wrong yar..What to do this.For all other pages like if i click on sign out buttom from upload button->redirected to sign-in and if i press back button it shows u are signed out.I dont know how to check session varibale exit for signinaction

Deepak Narwal 2010-01-26 19:50:24

i am editing the code with new one..

Deepak Narwal 2010-01-26 19:54:32

@Deepak: As the tutorial which I linked to says, you should redirect the user to another page after login. This should contain all information you need: http://www.thefutureoftheweb.com/blog/get-redirect-after-post (and imho this is a new question)

Felix Kling 2010-01-26 20:12:44

Answer 2

A:

you can check your session for thia page allow include ur session page on every page where u want it..

2010-01-26 15:55:31

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function.session-start is displaying on sign-in-action page with other correct links why so and how to check session for sign-in-action-form

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